CN101738616B - Laser distance-measuring device and control method thereof - Google Patents
Laser distance-measuring device and control method thereof Download PDFInfo
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- CN101738616B CN101738616B CN2008101848258A CN200810184825A CN101738616B CN 101738616 B CN101738616 B CN 101738616B CN 2008101848258 A CN2008101848258 A CN 2008101848258A CN 200810184825 A CN200810184825 A CN 200810184825A CN 101738616 B CN101738616 B CN 101738616B
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Abstract
The invention provides a laser distance-measuring device and a control method thereof. The laser distance-measuring device comprises a transmission assembly, a first liquid crystal display module, a second liquid crystal display module, a receiving assembly, a focusing lens and a control unit, wherein the transmission assembly transmits measuring light when in measurement, and simultaneously controls the first liquid crystal display module to be a lightproof state and the second liquid crystal display module to be a transparent state for receiving reference light by the receiving assembly; and again controls the first liquid crystal display module to be a transparent state and the second liquid crystal display module to be a lightproof state for receiving reflected light of a target. A distance value is calculated according to a phase difference of the reference light and the reflected light when the reflected light is more than a predetermined value and the transparency degree of the first liquid crystal display module to the reflected light is adjusted to be lower than the predetermined value.
Description
Technical field
The present invention relates to a kind of laser distance-measuring device, refer in particular to a kind of laser distance-measuring device and control method thereof of utilizing LCD MODULE to reach range finding.
Background technology
At laser chi now; In order to keep the accuracy of phase differential between measuring light and the reference light, a tripper generally is set, on reference path like Taiwan patent No. I288230; Disclose a kind of tripper that utilizes and cover the noise that the emission measurement light time is produced; Be when emitter emission measurement signal, on the reference light path, tripper be set, utilize the action of this tripper to reach and cover the veiling glare that measuring light reflexes to the reference light path fully; To avoid receiving trap to receive the interference of veiling glare, cause the degree of accuracy of measurement result to reduce.But; Utilize the mode of this tripper, can need sizable electric current and make power consumption bigger because of starting this tripper, and when action; Because the start of mechanism also can produce vibration and noise; In addition, when object is a high reflecting material or during closely, the electric signal that can cause receiving trap output because measuring signal reflected intensity is too big is saturated and can't calculate distance by this electric signal.
Summary of the invention
The technical matters that the present invention will solve is, to the above-mentioned shortcoming of prior art, a kind of laser distance-measuring device and control method thereof that has quiet, low power consumption and can adjust light intensity is provided.
The technical solution adopted for the present invention to solve the technical problems is, a kind of laser distance-measuring device is provided, and the distance in order to the measurement target thing comprises:
Emitting module is in order to produce measuring light;
First LCD MODULE has light transmission state and light tight state;
Second LCD MODULE has light transmission state and light tight state;
Receiving unit reflect the reflected light of this measuring light in order to receive this measuring light through the reference light of this second LCD MODULE and by this object, and according to these light intensity sizes that receive, correspondence is exported reference light electric signal and reflected light electric signal; And
Control module; In order to control this first LCD MODULE is that this light tight state and this second LCD MODULE receive this reference light electric signal for this light transmission state, this receiving unit; Control this first LCD MODULE again and be this light tight state and relatively this a reflected light electric signal and a predetermined value for this light transmission state and this second LCD MODULE; And when this reflected light electric signal is higher than this predetermined value, downgrade the penetrability of this first LCD MODULE.
In laser distance-measuring device of the present invention, more comprise:
First driver element is in order to light transmission state and the penetrability of setting this first LCD MODULE;
Second driver element is in order to light transmission state and the penetrability of setting this second LCD MODULE; And
Condenser lens is in order to be focused at this receiving unit with this reflected light.
In laser distance-measuring device of the present invention, this first driver element and this second driver element are according to printing opacity and light tight state and the penetrability of control signal to set this first LCD MODULE and this second LCD MODULE of this control module.
In laser distance-measuring device of the present invention, this control module more is included in the penetrability that downgrades this first LCD MODULE when this reflected light electric signal is lower than this predetermined value, by this reference light and this catoptrical phase differential, calculates a distance value.
In laser distance-measuring device of the present invention, this control module is microprocessor, complex programmable logic assembly or field programmable gate array.
The present invention also provides a kind of control method of laser distance-measuring device; The distance that is used for the measurement target thing; This laser distance-measuring device comprises emitting module, first LCD MODULE, second LCD MODULE, receiving unit and control module; When this laser distance-measuring device was measured, to the measuring light of object emission modulation, said method comprised the following steps:
Controlling this first LCD MODULE is light tight state, and this second LCD MODULE of control is a light transmission state;
Reception is by the reference light of this measuring light through this second LCD MODULE;
After receiving this reference light, controlling this first LCD MODULE is light transmission state, and this second LCD MODULE is light tight state;
Reception is by the reflected light of this this measuring light of object reflection; And
Relatively whether this catoptrical intensity is greater than a predetermined value, when being lower than a predetermined value as if this intensity of reflected light, by receiving this reference light and receiving this catoptrical phase differential; Compute distance values; When if this intensity of reflected light is higher than this predetermined value, controls this first LCD MODULE penetrability and reduce, when this intensity of reflected light is lower than this predetermined value; By receiving this reference light and receiving this catoptrical phase differential, calculate distance value.
In the control method of laser distance-measuring device of the present invention; Said laser distance-measuring device also comprises first driver element and second driver element; Controlling this first LCD MODULE is light tight state; Reaching this second LCD MODULE of control is that light transmission state comprises that more this this first driver element of control module control is light tight state to set this first LCD MODULE, and controls this second driver element, is light transmission state to set this second LCD MODULE.
In the control method of laser distance-measuring device of the present invention, receiving by the reference light of this measuring light through this second LCD MODULE is to receive this reference light by this receiving unit.
In the control method of laser distance-measuring device of the present invention, more comprise according to this reference light and catoptrical light intensity, produce reference light electric signal and reflected light electric signal respectively.
In the control method of laser distance-measuring device of the present invention, relatively whether this catoptrical intensity is by this control module relatively this reflected light electric signal and this predetermined value greater than a predetermined value.
The laser distance-measuring device of embodiment of the present invention and control method thereof have following beneficial effect: because utilize LCD MODULE, so when action; Control signal that only need be minimum gets final product stopping of control survey light or passes through, and can reach the effect that reduces power consumption and low noise, and because the volume of Liquid Crystal Module is less; Volume that more can reduction means; In addition, when object closely or when having the character of high reflection, see through the penetrability of setting Liquid Crystal Module; It is saturated that this receiving unit can not arrived because light intensity is too high, but and reach the effect of the kind that can increase range for measuring and measurement target thing.
For letting above and other objects of the present invention, characteristic and the advantage can be more obviously understandable, the hereinafter spy enumerates embodiment, and conjunction with figs. elaborates.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the calcspar of a kind of laser distance-measuring device of the embodiment of the invention;
Fig. 2 is the action synoptic diagram that the laser distance-measuring device of the embodiment of the invention receives reference light;
Fig. 3 is that the laser distance-measuring device of the embodiment of the invention receives catoptrical action synoptic diagram;
Fig. 4 is the control method process flow diagram of a kind of laser distance-measuring device of the embodiment of the invention.
Embodiment
See also Fig. 1; Be the calcspar of a kind of laser distance-measuring device of the embodiment of the invention, the laser distance-measuring device 10 of present embodiment comprises emitting module 101, first driver element 102, second driver element 103, first LCD MODULE 104, second LCD MODULE 105, receiving unit 106, condenser lens 107 and control module 108.
Consult Fig. 1, this emitting module 101 is in order to produce the measuring light Ls of modulation.More particularly; When this laser distance-measuring device 10 is desired to measure; This control module 108 can send this measuring light Ls with phase change by 101 pairs of objects of this emitting module of control; And this measuring light Ls can be earlier through this first LCD MODULE 104, if this first LCD MODULE 104 is light tight state, then this measuring light Ls is by these first LCD MODULE, 104 reflections becoming reference light Lm; If this first LCD MODULE 104 is a light transmission state, then this measuring light Ls can pass this first LCD MODULE 104 and arrive object.In present embodiment, this emitting module 101 is a laser module.
This first driver element 102 and this second driver element 103 are in order to set the light transmission state and the penetrability of this first LCD MODULE 104 and this second LCD MODULE 105 respectively.In present embodiment, this first, second driver element is liquid crystal display drive integrated circult (IC).
This first LCD MODULE 104 has light transmission state and light tight state, and wherein this first LCD MODULE 104 has an angle with the direct of travel of this measuring light Ls.Specifically; This first LCD MODULE 104 is according to the setting of this first driver element 102; Make this first LCD MODULE 104 be light transmission state or light tight state; With by this first LCD MODULE 104 this measuring light of control Ls whether through or stop; To control this object whether catoptrical generation is arranged, in addition, because the light path of this first LCD MODULE 104 and this measuring light Ls has the inclination of an angle; Therefore this first LCD MODULE 104 can reflect this measuring light Ls to this second LCD MODULE 105, and wherein this angle is to be decided by the mutual alignment between this emitting module 101, this first LCD MODULE 104 and this receiving unit 106.In present embodiment, this first LCD MODULE 104 is twisted nematic liquid crystals display screen (TN-LCD) or super-twist nematic LCDs (STN-LCD).
This second LCD MODULE 105 has light transmission state and light tight state, in order to control whether through or stop that this reference light Lm arrives this receiving unit 106.Specifically; Because of this first LCD MODULE 104 when the light tight state; Can reflect this measuring light Ls and become this reference light Lm, and when this second LCD MODULE 105 was light transmission state, this reference light Lm can pass this second LCD MODULE 105 and arrive these receiving units 106; But; Even at this first LCD MODULE 104 is under the light transmission state, the reflection that this measuring light Ls that passes through still has a little makes this receiving unit 106 receive this a little reflected light, disturbs and this receiving unit 106 produced when receiving; Therefore; Can stop the interference that this measuring light Lm is produced because of reflection when this first LCD MODULE 104 is light transmission state by this second LCD MODULE 105 of control, meaning promptly when receiving this reflected light Lr, stops any light that is reflected by this first LCD MODULE 104.In present embodiment, this second LCD MODULE 104 is twisted nematic LCD (TN-LCD) or super-twist nematic LCD (STN-LCD).
This receiving unit 106; In order to receive this measuring light Ls through the reference light Lm of this second LCD MODULE 105 and a reflected light Lr who reflects this measuring light Ls by this object; And according to receiving these light intensity sizes, corresponding output reference light electric signal and reflected light electric signal.This receiving unit 106 is arranged at and reaches on the reflected light Lr path on the reference light Lm travel path; When this first LCD MODULE 104 is light tight state; The measuring light Ls that this emitting module 101 sends meets this first LCD MODULE 104, understands the light tight state because of this first LCD MODULE 104, and makes this measuring light Ls be reflected onto this second LCD MODULE 105; And when this second LCD MODULE 105 is light transmission state; This measuring light Ls can arrive this receiving unit 106 through this second LCD MODULE 105, makes this measuring light Ls become reference light Lm, and after this receiving unit 106 receives this reference light Lm; Can be because of the light intensity of this reference light Lm, corresponding this reference light electric signal that produces.Identical ground; When this first LCD MODULE 104 was light transmission state, the measuring light Ls that this emitting module 101 sends met this first LCD MODULE 104, can be because the light transmission state of this first LCD MODULE 104; And make this measuring light Ls arrive object through this first LCD MODULE 104; This measuring light Ls runs into object and is reflected into reflected light Lr, via this condenser lens 107 this reflected light Lr is focused on this receiving unit 106, and after this receiving unit 106 receives this reflected light Lr; Can export this reflected light electric signal because of the light intensity of this reflected light Lr; The size of this electric signal wherein can change light intensity size that should reference light Lm, and this electric signal can be along with the phase change of this light the corresponding electric signal that produces with phase change.In present embodiment, this receiving unit 106 is avalanche diode (APD).
This condenser lens 107 is in order to be focused at this receiving unit 106 with this reflected light Lr.When this reflected light Lr is reflected by object far away; See through this condenser lens 107 this parallel reflected light Lr is focused on this receiving unit 106, make this receiving unit 106 receive this reflected light Lr that reflects by farther object by this condenser lens 107.This condenser lens 107 is convex lens in present embodiment, in an embodiment, is aspheric mirror.What deserves to be mentioned is that this condenser lens can be a simple lens or a compound lens.In an embodiment, this condenser lens is a lens combination.
The action situation of laser distance-measuring device 10 when measuring below will be described, see also Fig. 2 and shown in Figure 3, show the action synoptic diagram of laser distance-measuring device 10 when receiving reference light Lm and receiving reflected light Lr of the embodiment of the invention respectively; As shown in Figure 2; This control module 108 this laser distance-measuring device 10 be triggered carry out the measurement target object distance from the time, control this measuring light Ls that this emitting module 101 sends modulation, make this measuring light Ls have continuous phase and change; For instance; This measuring light Ls can be modulated into the sine wave with a frequency, so in a sinusoidal wave period, the variation that the phase place of this measuring light Ls can be continuous.
When sending measuring light Ls; These control module 108 these driver elements 102,103 of control; To set this first LCD MODULE 104 is light tight state, and reaching this second LCD MODULE 105 is light transmission state, therefore; This measuring light Ls is when arriving this first LCD MODULE 104; Can be because the direct of travel of this first LCD MODULE 104 and this measuring light Ls be an angle, so this measuring light Ls is reflected to this receiving unit 106, to produce this reference light electric signal and to input to this control module 108.
Afterwards, see also Fig. 3, these control module 108 these driver elements 102,103 of control; To set this first LCD MODULE 104 is light transmission state, and reaching this second LCD MODULE 105 is light tight state, so this measuring light Ls arrives objects through this first LCD MODULE 104; And this reflected light Lr of this object reflection is through the convergent effect of condenser lens 107; Make this reflected light Lr be focused at this receiving unit 106, and because this second LCD MODULE 105 of this moment is light tight state, therefore; Even a little reflected light Lr that is produced during through this first LCD MODULE 104 at this measuring light Ls; Also can be stopped and covered, become the noise that this receiving unit 106 receives, cause and disturb and the result of influence measurement and be unlikely.
And after this receiving unit 106 receives this reflected light Lr, export this reflected light electric signal to this control module 108, and this a reflected light electric signal and a predetermined value that this control module 108 will be imported compare; When if this reflected light electric signal is lower than a predetermined value; Then, calculate the distance value of object, when being higher than this predetermined value as if this reflected light electric signal by receiving this reference light electric signal and receiving this reflected light electric signal phase difference; Then this control module 108 is controlled these first driver elements 102; Penetrability to set this first LCD MODULE 104 reduces, so that this reflected light value of electrical signals reduction, when this reflected light electric signal is lower than this predetermined value; Then this control module 108 is controlled the light transmission state of this first LCD MODULE 104 and this second LCD MODULE 105 again; Receiving this reference light electric signal and this reflected light electric signal once more, and, calculate the distance of object by the phase differential of this reception.
The control method of the laser distance-measuring device of the embodiment of the invention then is described.See also Fig. 4; It is the control method process flow diagram of a kind of laser distance-measuring device 10 of the embodiment of the invention; Be used to measure the distance of an object; Wherein this laser distance-measuring device 10 comprises emitting module 101, first driver element 102, second driver element 103, first LCD MODULE 104, second LCD MODULE 105, receiving unit 106, condenser lens 107 and control module 108; When this laser distance-measuring device 10 was measured, to the measuring light of object emission modulation, this control method comprised the following steps:
Step 1, control this first LCD MODULE 104 and be light tight state, and this second LCD MODULE 105 of control is a light transmission state.Like step S401; Specifically; This step is that this control module 108 can this first driver element 102 of control be light tight state to set this first LCD MODULE 104, and controls this second driver element 103, is light transmission state to set this second LCD MODULE 105; Letting this measuring light Ls through the reflection of this first LCD MODULE 104, and through this second LCD MODULE 105.
Step 2, reception are by the reference light Lm of this measuring light Ls through this second LCD MODULE 105.Like step S402; This step is to receive this reference light Lm by this receiving unit 106, and according to the light intensity of this reference light Lm, corresponding output reference light electric signal; Wherein this reference light electric signal can for example be sinusoidal wave signal to should reference light Lm and become the signal of modulation.
Step 3, after receiving this reference light Lm, controls this first LCD MODULE 104 and be light transmission state, and this second LCD MODULE 105 is light tight state.Like step S403; This step is after this receiving unit 106 receives this reference light Lm; These control module 108 these first driver elements 102 of control are light transmission state to set this first LCD MODULE 104; And to control this second driver element 103 be light tight state to set this second LCD MODULE 105, makes this measuring light Ls be able to see through this first LCD MODULE 104, arrives object; And because this second LCD MODULE 105 light tight, make a little veiling glare that this measuring light Ls reflects through this first LCD MODULE 104 stopped and cover.
The reflected light Lr of this measuring light Ls is reflected in step 4, reception by this object.Like step S404, this reflected light of this step Lr is focused on this receiving unit 106 through behind this condenser lens 107, and by this this reflected light of receiving unit 106 sensings Lr, and generation reflected light electric signal inputs to this control module 108.
Step 5, relatively whether the intensity of this reflected light Lr greater than a predetermined value; If this reflected light Lr intensity is when being lower than predetermined value, by receiving this reference light Lm and receiving the phase differential of this reflected light Lr, compute distance values; When if this reflected light Lr intensity is higher than this predetermined value; Control these first LCD MODULE, 104 penetrabilitys and reduce, when this reflected light Lr intensity is lower than this predetermined value,, calculate the distance value of object by the phase differential of this reference light Lm and this reflected light Lr.Like step S405, step S406 and step S407, this control module 108 of this step compares this a reflected light value of electrical signals and a predetermined value when receiving this reflected light electric signal; To judge that whether this reflected light value of electrical signals is greater than this predetermined value (step S405); If this reflected light value of electrical signals during less than this default value, represent that this reflected light Lr intensity is suitable, so control module 108 is by this reference light electric signal and this reflected light electric signal phase difference; Calculate this distance value (step S407); On the contrary, if this reflected light value of electrical signals during greater than this predetermined value, judges that this reflected light Lr intensity that this receiving unit 106 receives is too strong; This reflected light electric signal that causes this receiving unit 106 to produce is saturated; Therefore, these control module 108 these first driver elements 102 of control reduce (step S406) with the penetrability of setting this first LCD MODULE 104, when this reflected light electric signal is lower than this predetermined value; By this reference light electric signal and this reflected light electric signal phase difference, calculate the distance value of this object.
In an embodiment, this step 1 and step 3 are exchanged; This step 2 and step 4 are exchanged, and also can calculate the distance value of this object.
The present invention from the above utilizes the light transmission state of LCD MODULE and light tight state to come as the photoswitch valve, and controls this LCD MODULE, makes receiving unit 106 when receiving reference light Lm and reflected light Lr separately; Can not interfere with each other and improve the accuracy rate of calculating, thereby and the electric signal that utilizes electric signal that receiving unit 106 receiving optical signals are produced and predetermined value to compare to judge receiving unit 106 full closing whether, and when surpassing predetermined value; By the penetrability of adjustment LCD MODULE, make measuring light Ls intensity reduce, and then reduce the reflected light Lr intensity that is focused at this receiving unit 106; Make this receiving unit 106 can export suitable reflected light electric signal, by the phase differential of this light signal, calculate the object distance accurately again; Therefore, the present invention is because utilize LCD MODULE, so when action; Control signal that only need be minimum gets final product stopping of control survey light Ls or passes through, and can reach the effect that reduces power consumption and low noise, and because the volume of Liquid Crystal Module is less; Volume that more can reduction means; In addition, when object closely or when having the character of high reflection, see through the penetrability of setting Liquid Crystal Module; It is saturated that this receiving unit 106 can not arrived because light intensity is too high, but and reach the effect of the kind that can increase range for measuring and measurement target thing.
Though the present invention discloses as above with embodiment; But it is not in order to limiting scope of the present invention, and those skilled in the art person is not breaking away from the spirit and scope of the present invention; Can do a little change and retouching, so protection scope of the present invention is as the criterion when looking the claim person of defining.
Claims (10)
1. laser distance-measuring device, the distance in order to the measurement target thing is characterized in that, comprising:
Emitting module is in order to produce measuring light;
First LCD MODULE comprises light transmission state and light tight state;
Second LCD MODULE comprises light transmission state and light tight state;
This first LCD MODULE is at light tight state and second LCD MODULE during at light transmission state, this measuring light to the second LCD MODULE of first LCD MODULE reflection, and become reference light through second LCD MODULE;
During at light tight state, this measuring light arrives object through first LCD MODULE to this first LCD MODULE at light transmission state and second LCD MODULE, and by object reflection becoming reflected light;
Receiving unit reflect the reflected light of this measuring light in order to receive this measuring light through the reference light of this second LCD MODULE and by this object, and according to these light intensity sizes that receive, correspondence is exported reference light electric signal and reflected light electric signal; And
Control module; In order to control this first LCD MODULE is that this light tight state and this second LCD MODULE receive this reference light electric signal for this light transmission state, this receiving unit; Control this first LCD MODULE again and be this light tight state and relatively this a reflected light electric signal and a predetermined value for this light transmission state and this second LCD MODULE; And when this reflected light electric signal was higher than this predetermined value, the penetrability that downgrades this first LCD MODULE was to avoid the reflected light electric signal saturated.
2. laser distance-measuring device as claimed in claim 1 is characterized in that, more comprises:
First driver element is in order to light transmission state and the penetrability of setting this first LCD MODULE;
Second driver element is in order to light transmission state and the penetrability of setting this second LCD MODULE; And
Condenser lens is in order to be focused at this receiving unit with this reflected light.
3. laser distance-measuring device as claimed in claim 2; It is characterized in that this first driver element and this second driver element are according to printing opacity and light tight state and the penetrability of control signal to set this first LCD MODULE and this second LCD MODULE of this control module.
4. laser distance-measuring device as claimed in claim 1; It is characterized in that; This control module more is included in the penetrability that downgrades this first LCD MODULE when this reflected light electric signal is lower than this predetermined value, by this reference light and this catoptrical phase differential, calculates a distance value.
5. laser distance-measuring device as claimed in claim 1 is characterized in that, this control module is microprocessor, complex programmable logic assembly or field programmable gate array.
6. the control method of a laser distance-measuring device; The distance that is used for the measurement target thing; It is characterized in that this laser distance-measuring device comprises emitting module, first LCD MODULE, second LCD MODULE, receiving unit and control module, when this laser distance-measuring device is measured; To the measuring light of object emission modulation, said method comprises the following steps:
Controlling this first LCD MODULE is light tight state, and reaching this second LCD MODULE of control is light transmission state, and first LCD MODULE reflects this measuring light to the second LCD MODULE, and becomes reference light through second LCD MODULE;
Reception is by the reference light of this measuring light through this second LCD MODULE;
After receiving this reference light, controlling this first LCD MODULE is light transmission state, and reaching this second LCD MODULE is light tight state, and this measuring light arrives object through first LCD MODULE, and by object reflection becoming reflected light;
Reception is by the reflected light of this this measuring light of object reflection; And
Relatively whether this catoptrical intensity is greater than a predetermined value, when being lower than a predetermined value as if this intensity of reflected light, by receiving this reference light and receiving this catoptrical phase differential; Compute distance values; When if this intensity of reflected light is higher than this predetermined value, controls this first LCD MODULE penetrability and reduce to avoid the reflected light electric signal saturated, when this intensity of reflected light is lower than this predetermined value; By receiving this reference light and receiving this catoptrical phase differential, calculate distance value.
7. the control method of laser distance-measuring device as claimed in claim 6; It is characterized in that; Said laser distance-measuring device also comprises first driver element and second driver element; Controlling this first LCD MODULE is light tight state; Reaching this second LCD MODULE of control is that light transmission state comprises that more this this first driver element of control module control is light tight state to set this first LCD MODULE, and controls this second driver element, is light transmission state to set this second LCD MODULE.
8. the control method of laser distance-measuring device as claimed in claim 6 is characterized in that, receiving by the reference light of this measuring light through this second LCD MODULE is to be received by this receiving unit.
9. the control method of laser distance-measuring device as claimed in claim 8 is characterized in that, more comprises according to this reference light and catoptrical light intensity, produces reference light electric signal and reflected light electric signal respectively.
10. the control method of laser distance-measuring device as claimed in claim 9 is characterized in that, relatively whether this catoptrical intensity is by this control module relatively this reflected light electric signal and this predetermined value greater than a predetermined value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101848258A CN101738616B (en) | 2008-11-27 | 2008-11-27 | Laser distance-measuring device and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101848258A CN101738616B (en) | 2008-11-27 | 2008-11-27 | Laser distance-measuring device and control method thereof |
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| CN101738616A CN101738616A (en) | 2010-06-16 |
| CN101738616B true CN101738616B (en) | 2012-07-18 |
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| CN2008101848258A Expired - Fee Related CN101738616B (en) | 2008-11-27 | 2008-11-27 | Laser distance-measuring device and control method thereof |
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| CN101762809B (en) * | 2009-12-29 | 2012-08-08 | 江苏徕兹光电科技有限公司 | Calibration method based on liquid crystal light valve principle phase position measurement, calibration device and distance measuring device |
| JP7057067B2 (en) * | 2017-03-10 | 2022-04-19 | 株式会社ミツトヨ | Optical displacement meter, adjustment method of optical displacement meter and optical displacement measurement method |
| CN112012613B (en) * | 2019-05-30 | 2022-03-08 | 惠州拓邦电气技术有限公司 | Light saturation prevention method for ray tracing trackless electric door and trackless electric door |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4676601A (en) * | 1983-11-14 | 1987-06-30 | Nippondenso Co., Ltd. | Drive apparatus for a liquid crystal dazzle-free mirror arrangement |
| US5208642A (en) * | 1992-04-29 | 1993-05-04 | Optec Co. Ltd. | Electro-optical distance meter |
| CN1123573A (en) * | 1993-05-15 | 1996-05-29 | 莱卡公开股份有限公司 | Device for measuring distance |
| CN1940595A (en) * | 2005-09-30 | 2007-04-04 | 株式会社拓普康 | Distance measuring device |
-
2008
- 2008-11-27 CN CN2008101848258A patent/CN101738616B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4676601A (en) * | 1983-11-14 | 1987-06-30 | Nippondenso Co., Ltd. | Drive apparatus for a liquid crystal dazzle-free mirror arrangement |
| US5208642A (en) * | 1992-04-29 | 1993-05-04 | Optec Co. Ltd. | Electro-optical distance meter |
| CN1123573A (en) * | 1993-05-15 | 1996-05-29 | 莱卡公开股份有限公司 | Device for measuring distance |
| CN1940595A (en) * | 2005-09-30 | 2007-04-04 | 株式会社拓普康 | Distance measuring device |
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