WO2014063311A1

WO2014063311A1 - Detection apparatus based on test paper

Info

Publication number: WO2014063311A1
Application number: PCT/CN2012/083401
Authority: WO
Inventors: 曲巍; 朱丹军
Original assignee: 天津天合众生医疗科技有限公司
Priority date: 2012-10-24
Filing date: 2012-10-24
Publication date: 2014-05-01
Also published as: CN105143854A; CN105143854B

Abstract

A detection apparatus based on test paper (101). The apparatus comprises: at least two kinds of test cores (100) for bearing test paper (101), and a detector body (200) provided with a cavity for bearing the test cores (100), wherein each test core (100) corresponds to a substance to be tested uniquely; the housing of the test core (100) is provided with a test window (102) for displaying a test region on the test paper (101); and the detector body (200) comprises: a detection circuit which can detect a substance to be tested in the test paper (101) borne by the at least two kinds of test cores (100) through a corresponding detection program, and at least two contact switches in the cavity which can start the corresponding detection program of the detection circuit to detect the substance to be tested after being triggered by the test cores (100), wherein each contact switch corresponds to a detection program uniquely. A detection apparatus based on test paper (101) can trigger different detection programs in a detection circuit through different test cores (100), and realize the detection of different substances to be tested using one detection apparatus. Therefore, the problem of high consumption costs for detecting a plurality of substances can be solved.

Description

Test paper based detection device

Technical field

Background of the Invention This invention relates to the field of liquid detection techniques, and more particularly to a test strip based detection apparatus suitable for detecting the presence or concentration of a substance to be tested in a liquid.

Background technique

In normal work and life, it is usually necessary to detect the presence or absence of a certain substance in the liquid or to reach a certain concentration, and then perform corresponding treatment according to the detection result. For example: determining the water quality or the degree of contamination of the water source by detecting the concentration of an amino acid in the water source, or determining whether the person belonging to the urine is pregnant by detecting the presence or absence of human chorionic gonadotropin (HCG) in the urine. . In the prior art, a digital test pen for detecting the presence or concentration of a substance to be tested in a liquid has been favored by people because of its high test accuracy. For example, the digital test pens used for urine testing on the market are composed of a casing, a liquid suction block, a test paper, a test circuit, etc., and the appearance is divided into two parts: a pen body and a pen cap. After the pen cap is opened, urine is sucked. Cover the cap and lay it on the table for about 5 minutes. The test result is obtained through the LCD display. The principle is as follows: After the aspirating block absorbs the urine, the urine is transferred to the test paper, and the antigen or antibody coated on the test paper occurs. Reaction, if the measured substance in the urine reaches the detected concentration, the test area of the test paper shows red or other specific color. At this time, the test circuit reads the color of the test area, and gives a more accurate test result according to the judgment of the color. . However, the existing digital test pen usually has a unique correspondence with the tested substance, that is, a digital test pen can only detect whether a certain substance in the liquid exists or reaches a certain concentration, which makes it necessary to When testing several kinds of substances in a variety of liquids, people must A variety of corresponding digital test pens must be purchased. It can be seen that the existing digital test pens have great limitations in use, which results in high cost when detecting multiple substances. Summary of the invention

In order to solve the above technical problem, the embodiment of the present invention provides a test device based on a test paper to solve the problem of high cost when detecting a plurality of substances, and the technical solution is as follows:

A test strip-based detecting device is suitable for detecting the presence or concentration of a substance to be tested in a liquid, and the detecting device comprises:

At least two test cores for carrying test strips, and a detector body provided with a cavity for carrying the test cores, wherein each test core uniquely corresponds to a test substance;

The housing of the test core is provided with a test window for displaying a test area on the test strip; the detector body includes: capable of detecting a substance to be tested in the test paper carried by the at least two test cores by a corresponding detection program a detection circuit, at least two contact switches located in the cavity capable of starting a corresponding detection program of the detection circuit to detect a substance to be tested after being triggered by the test core, wherein each contact switch uniquely corresponds A test procedure.

Wherein the outer shell of the test core is further provided with a first locking element for fixing it in the cavity;

The inner wall of the cavity of the detector body is further provided with a second locking element adapted to the first locking element.

Wherein, the housing of the detector body is further provided with a display window for displaying the detection result output by the detecting circuit.

The detector body further includes: disposed on a housing of the detector body, for A release element that is secured to the test core secured within the cavity.

The detector body further includes: a movable switch spring, an elastic member; wherein one end of the elastic member is fixed in the cavity, and the other end is connected to the switch spring;

The at least two test cores have different lengths and the first locking element is located at a first distance from the first end of the respective test core.

Wherein, at least two first protrusions as contact switches are disposed on the inner wall of the cavity of the detector body;

The at least two test cores have the same length, the first locking element is located at a second distance from the first end of the respective test core, and the different positions of the outer casing of the at least two test cores are usefully set And a first groove for receiving the first protrusion, wherein the first groove is located between the first locking element and the second end of the corresponding test core.

Wherein, at least two second grooves are disposed on the inner wall of the cavity of the detector body, wherein a contact switch is disposed in the second groove;

The at least two test cores have the same length, the first locking element is located at a third distance from the first end of the respective test core, and the different positions of the outer casing of the at least two test cores are useful a second protrusion for triggering the contact switch in the second recess, wherein the second protrusion is located between the first locking element and the second end of the corresponding test core.

The detection circuit includes:

a light source capable of emitting light of at least two wavelengths for illuminating a test area of the test paper and connected to a microprocessor;

a light detecting element for detecting reflected light from the test area, converting the detected optical signal of the reflected light into an electrical signal and transmitting the signal to an A/D conversion circuit, and being connected to the microprocessor; An A/D conversion circuit for performing analog/digital conversion on the electrical signal and transmitting the same to a microprocessor; a microprocessor for controlling the light source, the light detecting element, and the A/D conversion circuit, and The analog-to-digital converted electrical signal is subjected to analysis processing to determine a detection result;

a display for displaying a detection result determined by the microprocessor.

In the test paper-based detecting device provided by the present invention, after the different kinds of test cores carrying the test paper are fixed in the cavity of the detector body, different contact switches can be triggered, and then the contact switches are activated. The detection program of the detection circuit finally realizes the detection of the test area displayed by the test window of the test core by using the detection program. Compared with the prior art, the test strip-based detecting device provided by the solution can trigger different detecting programs in the detecting circuit through different test cores, thereby realizing detection of different tested substances by using one detecting device, and therefore, can solve The problem of high cost when detecting multiple substances. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic view showing a first structure of a test strip-based detecting apparatus according to an embodiment of the present invention;

2 is a schematic structural view of a test core in a test strip-based detecting apparatus according to an embodiment of the present invention;

3 is a regional distribution diagram of a test paper in an embodiment of the present invention; FIG. 4 is a second schematic structural diagram of a test strip-based detecting apparatus according to an embodiment of the present invention; FIG.

FIG. 5 is a schematic view showing a position where a first locking component is disposed on three test cores according to an embodiment of the present invention; FIG.

6 is a schematic view showing a third structure of a test strip-based detecting device according to an embodiment of the present invention;

FIG. 7 is a schematic view showing a fourth structure of a test strip-based detecting apparatus according to an embodiment of the present invention. detailed description

BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without the creative work are all within the scope of the present invention.

The existing digital test pen usually has a unique correspondence with the tested substance, that is, a digital test pen can only detect whether a certain substance in the liquid exists or reaches a certain concentration, which makes it necessary to When testing several kinds of substances in a variety of liquids, people must purchase a variety of corresponding digital test pens. It can be seen that the existing digital test pens have great limitations, which leads to costly detection of multiple substances. Higher.

In order to solve the problem of high cost when detecting a plurality of substances, the embodiment of the present invention provides a test paper-based detecting device suitable for detecting the presence or concentration of a substance to be tested in a liquid.

As shown in FIG. 1 and FIG. 2, the test strip-based detecting apparatus provided by the embodiment of the present invention may include: At least two test cores 100 for the ₇ -test paper 101, and a detector body 200 provided with a cavity for carrying the test core 100, wherein each test core 100 uniquely corresponds to a test substance;

A test window for displaying a test area on the test strip 101 is disposed on the outer casing of the test core 100.

102;

The detector body 200 can include: the at least two test cores capable of being passed through respective detection programs

A detecting circuit (not shown) for detecting a substance to be tested in 100 test strips, at least two of which are located in the cavity, can be activated by the test core 100 to activate a corresponding detection program of the detecting circuit for detecting a substance to be tested. The contact switch (not shown), wherein each contact switch uniquely corresponds to a detection procedure.

In the test strip-based detecting device provided by the present invention, different types of test cores 100 carrying test strips 101 can be triggered by different contact switches after being fixed in the cavity of the detector body 200, thereby starting the contacts. The detection procedure of the detection circuit corresponding to the switch finally realizes the detection of the test area displayed by the test window 102 of the test core 100 by the detection program. Compared with the prior art, the test strip-based detecting device provided by the solution can trigger different detecting programs in the detecting circuit through different test cores, thereby realizing the detection of different tested substances by using a detecting device, and therefore, can solve The problem of high cost when detecting multiple substances.

As shown in FIG. 3, the test paper 101 carried by the test core 100 may include: a sample application area, a test area, and a liquid absorption area; the sample application area is a liquid inlet end of the test paper 101, and the liquid to be tested is from the sample application area. Inhalation, flowing in the direction of the liquid absorption zone, develops color at the test zone, and the liquid absorption zone is used to adsorb the reacted liquid to be tested. It can be understood that the test paper 101 shown in FIG. 3 is only an example, and should not constitute a limitation on the embodiment of the present invention. In practical applications, the test paper 101 can also select other regional setting forms.

Wherein, the detecting circuit can include: a light source capable of emitting light of at least two wavelengths, which is used for Irradiating the test area of the test strip 101 and connected to a microprocessor; a light detecting element for detecting reflected light from the test area, converting the detected optical signal of the reflected light into an electrical signal and transmitting to

An A/D conversion circuit connected to the microprocessor; an A/D conversion circuit for analog/digital conversion of the electrical signal and sent to the microprocessor; a microprocessor for controlling the light source, a light detecting component and an A/D converting circuit, and analyzing and analyzing the electronic signal converted by the analog to digital to determine a detection result; and displaying a display for displaying the detection flag determined by the microprocessor. Wherein, only one set of light source and light detecting component is needed in the detecting circuit, and the light source emits light of different colors to illuminate the test area, thereby detecting the reflected light intensity of the test area under different color illumination conditions, and determining the detection result by a correlation algorithm. Output to the display for display. It should be noted that, since the test paper 101 carried by the at least two test cores 100 is detected, when the detection circuit is utilized, various correlation algorithms need to be set to complete detection of a plurality of tested substances; It will be understood by those skilled in the art that the detection circuit is not limited thereto as long as it can be detected by the corresponding detection program for the substance to be tested in the test paper carried by the at least two test cores.

Wherein, the test core 100 can be fixed in the cavity of the detector body 200 by manual hand grasping, so that when the test core 100 is fixed, the corresponding contact switch can be triggered. Further, in order to fix the test core 100 in the cavity of the detector body 200 without hand grasping, the outer shell of the test core 100 may be provided with a first means for fixing it in the cavity. a locking element; at the same time, the inner wall of the cavity of the detector body 200 is provided with a second locking element adapted to the first locking element, and further through the first locking element and the second locking element The test core 100 is fixed in the cavity of the detector body 200. It can be understood that, in practical applications, the first locking element may be two grooves disposed on the outer casing of the test core 100, and the second locking element may be a buckle disposed on the inner wall of the cavity. So that when the test core 100 is inserted into When the cavity is in the cavity, the buckle catches the groove, thereby realizing the fixing of the test core 100 in the cavity; or the first locking component may be a buckle disposed on the outer casing of the test core 100, and The second locking element may be two grooves disposed on the inner wall of the cavity, such that when the test core 100 is inserted into the cavity, the buckle catches the groove, and the test core 100 is realized The fixation in the cavity is of course not limited to this.

Further, as shown in FIG. 1, the housing of the detector body 200 is further provided with a display window 201 for displaying the detection result output by the detection circuit, thereby realizing the purpose of visually displaying the detection result to the user. Of course, it is also reasonable to perform voice output on the detection result of the detection circuit by the sound output element.

Further, the detector body 200 may further include: a release member 202 disposed on the outer casing of the detector body 200 for releasing the test core 100 fixed in the cavity. Wherein, by pressing the release member 202, the test core 100 fixed in the cavity by the first locking member and the second locking member can be unlocked, and the test core 100 can be freely moved in and out of the cavity. The test strip-based detecting device provided by the present invention will be described below in conjunction with a specific application example.

As shown in FIG. 1-2 and FIG. 4, a test strip-based detecting device may include:

The test core 100 for carrying the test strip 101 is provided with a detector body 200 for carrying the cavity of the test core 100, wherein each test core 100 uniquely corresponds to a test substance;

The test case 100 is provided with a test window for displaying a test area on the test strip 101.

102, and a first locking element 103 for fixing it in the cavity; meanwhile, as shown in FIG. 5, the three test cores 100 have different lengths, and the first locking element 103 is located at a distance Corresponding test a first distance of the first end of the core 100;

The detector body 200 can include: a detection circuit (not shown) capable of detecting the substance to be tested in the test strip 101 carried by the three test cores 100 through a corresponding detection program, and the display module is disposed on the housing for displaying the detection circuit a display window 201 for outputting a detection flaw, a contact switch 1-3 located in the cavity and capable of starting a corresponding detection program of the detection circuit for detecting a substance to be tested after being triggered by the test core 100, and being disposed in the cavity a second locking member (not shown) adapted to the first locking member 103, a movable switching spring 204, and an elastic member 203; wherein one end of the elastic member 203 is fixed to the air The switch spring 204 is connected to the other end of the cavity.

The first end of the test core 100 may be one end of the corresponding sample loading area, and the second end may be one end corresponding to the liquid absorption area, of course, not limited thereto; and the first distance may be set according to actual conditions. The elastic member may be a spring or an elastic block. Of course, it is not limited thereto. As long as the test core 100 is pushed to push the switch spring 204, the elastic member 203 is deformed accordingly.

The working principle of the test strip-based detecting device provided in this embodiment may be:

The test core 100 is in contact with the switch spring 204 during its insertion into the cavity and compresses the elastic member 203 during insertion to deform it; when the first locking member 103 When the test core 100 is locked in the cavity, the elastic element 203 is compressed to such an extent that the switch spring 204 can be brought into contact with the desired contact switch, thereby enabling the The detection program corresponding to the contact switch is used to detect the test area displayed by the test window 102, and the output result of the detection circuit is displayed through the display window 201, thereby realizing the test in the test strip 101 carried by the test core 100. Detection of the presence or concentration of a substance.

It can be understood that, as shown in FIG. 5, since different test cores 100 have different lengths, and And the first locking element 103 is located at a first distance from the first end, such that when the first locking element 103 and the second locking element lock the test core 100, different test cores 100 enter the cavity. The different lengths result in different test cores being able to deform the elastic elements 203 to varying degrees, and ultimately different test cores 100 can trigger different contact switches by means of the switch springs. It should be noted that, in the process that the switch spring 204 is pushed by the test core 100 to the contact switch 3, the switch spring 204 will sequentially contact the contact switch 1, the contact switch 2 and the contact switch 3, and the elastic element After the 203 is stabilized, the detection circuit reads the contact state of the switch reed 204, and therefore, no erroneous operation occurs.

It can be seen that, in the test strip-based detecting device provided by the embodiment, when the test cores of different lengths are in the locked state in the cavity, the elastic member is compressed to enable the switch spring to contact the desired contact switch. Degree, and then the detection program corresponding to the contact switch is activated, and the test area is used to detect the test area displayed in the test window, thereby realizing the detection of different substances to be tested by using a detecting device, and therefore, the detection can be solved. The problem of high cost when it comes to materials. The test strip-based detecting device provided by the embodiment of the present invention will be described below in conjunction with another specific application example.

As shown in FIG. 1-2 and FIG. 6, a test strip-based detecting device may include:

The test core 100 for the 7-load test strip 101 is provided with a detector body 200 for 7|L carrying the cavity of the test core 100, wherein each test core 100 uniquely corresponds to a test substance;

The outer casing of the test core 100 is provided with a test window 102 for displaying a test area on the test strip 101, and a first locking member 103 for fixing it in the cavity; meanwhile, the three tests 100 have the same a length, the first locking element 103 is located at a second distance from the first end of the corresponding test core 100, and different positions of the outer casing of the three test cores 100 are provided for accommodating the first a first groove 104 of the protrusion 205, wherein the first groove 104 is located between the first locking element 103 and the second end of the corresponding test core 100;

The detector body 200 includes: a detection circuit (not shown) capable of detecting the substance to be tested in the test paper 101 carried by the three test cores 100 through a corresponding detection program, and the display circuit is disposed on the housing a display window 201 for outputting the detection result, and three first protrusions 205 on the inner wall of the cavity which can be activated by the test core 100 to activate the detection circuit corresponding detection program for detecting the substance to be tested, and are disposed in the cavity A second locking element (not shown) adapted to the first locking element.

The first end of the test core 100 may be one end of the corresponding sample application area, and the second end may be one end corresponding to the liquid absorption area, of course, not limited thereto; the first protrusion 205 serves as a contact switch; The second distance can be set according to the actual situation and is not limited herein; the cavity has sufficient space that the test core 100 can be inserted into the cavity without touching any of the first protrusions 205, the first protrusion The 205 can be set in the form of a shrapnel, and of course, it is not limited to this.

The working principle of the test strip detecting device provided in this embodiment may be:

During the insertion of the test core 100 into the cavity, the first groove 104 of the test core 100 is tested when the first locking element 103 and the second locking element cooperate to lock the test core 100 within the cavity. The corresponding first protrusion 205 can be received so that it is not triggered, and the position of the test core 100 not provided with the first groove 104 can press the required first protrusion 205, thereby starting the desired first protrusion The detection program corresponding to 205 is used, and the test area displayed by the test window 102 is detected by the detection program, and the presence or concentration of the detected substance in the test strip 101 of the test core 100 is detected, and the display is displayed through the display window 201. Detect the output of the circuit.

It can be understood that since the different test cores 100 have the same length, and the first locking element The piece 103 is located at a second distance from the first end, and the position of the first groove 104 is different, such that when the first locking element 103 and the second locking element lock the test core 100, the different positions A bump 205 is triggered to initiate different detection procedures to detect a plurality of measured substances.

It can be seen that, in the test strip-based detecting device provided by the embodiment of the present invention, the first recesses of different test cores are disposed on the outer shell of the different test cores, so that when the first locking component and the second locking component are matched, the test core is When the cavity is locked, the first groove can accommodate the corresponding first protrusion so that it is not triggered, and the position where the first groove is not provided can press the required first protrusion, and then Activating the detection program corresponding to the first protrusion required, and using the detection program to detect the test area displayed in the test window, thereby realizing the detection of different substances to be tested by using a detecting device, thereby solving the detection more The problem of high cost when it comes to materials. The test strip-based detecting device provided by the embodiment of the present invention will be described below in conjunction with another specific application example.

As shown in FIG. 1-2 and FIG. 7, a test strip-based detecting device may include:

The test core 100 for carrying the test paper 100 is provided with a detector body 200 for carrying the cavity of the test core 100, wherein each test core 100 uniquely corresponds to a test substance;

The test case 100 is provided with a test window 102 for displaying a test area on the test strip 101, and a first locking member 103 for fixing it in the cavity; meanwhile, the three test cores have the same a length, the first locking element 103 is located at a third distance from the first end of the corresponding test core 100, and different positions of the outer casing of the three test cores are provided for triggering the contact switch in the second groove 206 a second protrusion 105, wherein the second protrusion 105 is located between the first locking element 103 and the second end of the corresponding test core; The detector body 200 can include: a detection circuit (not shown) capable of detecting the substance to be tested in the test strip 101 carried by the three test cores 100 through a corresponding detection program, and the display module is disposed on the housing for displaying the detection circuit The display window 201 for outputting the detection result, the three contact switches located in the second recess 206 on the inner wall of the cavity and capable of starting the corresponding detection program of the detecting circuit to detect the detected substance after being triggered by the test core 100 And a second locking element (not shown) disposed in the cavity and adapted to the first locking element 103.

The first end of the test core 100 may be one end of the corresponding sample application area, and the second end may be one end corresponding to the liquid absorption area, of course, not limited thereto; the third distance may be set according to actual conditions. This is not limited; the cavity has sufficient space so that the test core can be smoothly inserted into the cavity, and the second protrusion can be provided in the form of a spring piece, of course, without being limited thereto.

When the test core 100 is inserted into the cavity, when the first locking component 103 and the second locking component cooperate to lock the test core 100 in the cavity, the test core 100 is not provided on the outer casing. The position of the second protrusion 105 cannot be embedded in the corresponding second groove 206, so that the corresponding contact switch cannot be triggered, and the second protrusion 105 on the outer casing can trigger the contact switch in the required second groove 206, Then, the corresponding detection program is started, and the test area displayed by the test window 102 is detected by the detection program, and the presence or concentration of the detected substance in the test paper 101 carried by the test core 100 is detected, and the detection is displayed through the display window 201. The output of the circuit.

It can be understood that since the different test cores 100 have the same length, and the first locking element 103 is located at a third distance from the first end, and the position of the second protrusion 105 is different, so that when the first lock is When the component 103 and the second locking component lock the test core 100, the second protrusions 105 at different positions can trigger the contact switches in the different second grooves 206, thereby starting different detection procedures. Achieve the detection of a variety of tested substances.

It can be seen that, in the test strip-based detecting device provided by the embodiment of the present invention, the positions of the second protrusions on the outer shells of different test cores are different, and when the first locking element and the second locking element are matched, the test core is When the cavity is locked, the position where the second protrusion is not disposed cannot be embedded in the second groove, and the second protrusion can trigger the contact switch at the required second groove, thereby starting the corresponding The detection program is used to detect the test area displayed in the test window, thereby realizing the detection of different substances to be tested by using a detecting device, and therefore, the problem of high cost when detecting a plurality of substances can be solved. It should be noted that, although the above three specific embodiments use the three test cores and the corresponding three contact switches as an example to introduce the test strip-based detecting device provided by the embodiment of the present invention, in practical applications, It is reasonable to set up other numbers of test cores and corresponding contact switches to complete the detection of the presence or concentration of the corresponding amount of the tested substance. In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners without departing from the spirit and scope of the application. The present embodiment is merely an illustrative example and should not be taken as limiting, and the specific content given should not limit the purpose of the application. For example, the division of the unit or subunit is only a logical function division, and the actual implementation may have another division manner, for example, a plurality of units or a plurality of subunits are combined. In addition, multiple units may or may be combined or integrated into another system, or some features may be omitted or not implemented.

In addition, the described systems, apparatus and methods, and schematic diagrams of various embodiments, do not exceed this application Within the scope of the request, it can be combined or integrated with other systems, modules, technologies or methods. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The above is only a specific embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

Rights request

1. A detection device based on test paper, suitable for detecting the presence or concentration of a substance to be measured in a liquid, which is characterized by including:

At least two kinds of test cores for carrying test strips, and a detector body provided with a cavity for carrying the test cores, wherein each test core uniquely corresponds to a measured substance;

The outer shell of the test core is provided with a test window for displaying the test area on the test paper; the detector body includes: capable of detecting the measured substances in the test paper carried by the at least two test cores through corresponding detection programs A detection circuit, and at least two contact switches located in the cavity that can start the corresponding detection program of the detection circuit to detect the substance to be tested after being triggered by the test core, wherein each contact switch is unique Corresponds to a detection program.

2. The detection device according to claim 1, characterized in that the outer shell of the test core is also provided with a first locking element for fixing it in the cavity;

A second locking element matching the first locking element is also provided on the inner wall of the cavity of the detector body.

3. The detection device according to claim 1 or 2, characterized in that the outer casing of the detector body is further provided with a display window for displaying the detection results output by the detection circuit.

4. The detection device according to claim 1 or 2, characterized in that, the detector body further includes: a test device provided on the outer shell of the detector body for fixing in the cavity. The release element releases the core.

5. The detection device according to claim 2, characterized in that, the detector body further includes: a movable switch reed and an elastic element; wherein, one end of the elastic element is fixed in the cavity, The other end is connected to the switch reed; The at least two test cores have different lengths, and the first locking element is located a first distance from the first end of the respective test core.

6. The detection device according to claim 2, characterized in that at least two first protrusions serving as contact switches are also provided on the inner wall of the cavity of the detector body;

The at least two test cores have the same length, the first locking element is located at a second distance from the first end of the corresponding test core, and the housings of the at least two test cores are arranged at different positions. For accommodating the first groove of the first protrusion, wherein the first groove is located between the first locking element and the second end of the corresponding test core.

7. The detection device according to claim 2, characterized in that at least two second grooves are provided on the inner wall of the cavity of the detector body, wherein a contact switch is provided in the second grooves ; The at least two test cores have the same length, the first locking element is located at a third distance from the first end of the corresponding test core, and the housings of the at least two test cores are arranged at different positions There is a second protrusion for triggering the contact switch in the second groove, wherein the second protrusion is located between the first locking element and the second end of the corresponding test core.

8. The detection device according to claim 1, characterized in that the detection circuit includes: a light source capable of emitting light of at least two wavelengths, which is used to illuminate the test area of the test paper, and is combined with a microprocessor connected; connected

A light detection element, which is used to detect the reflected light from the test area, convert the detected optical signal of the reflected light into an electrical signal and send it to the AD conversion circuit, and is connected to the microprocessor; A/D A conversion circuit, which is used to perform analog/digital conversion on the electrical signal and send it to a microprocessor; a microprocessor, which is used to control the light source, the light detection element and the A/D conversion circuit, and analyze the process Analyze and process the analog-to-digital converted electrical signal to determine a detection result; A display used to display the detection results determined by the microprocessor.