CN1327189C - Switched mode digital displacement transducer - Google Patents
Switched mode digital displacement transducer Download PDFInfo
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- CN1327189C CN1327189C CNB2005100119558A CN200510011955A CN1327189C CN 1327189 C CN1327189 C CN 1327189C CN B2005100119558 A CNB2005100119558 A CN B2005100119558A CN 200510011955 A CN200510011955 A CN 200510011955A CN 1327189 C CN1327189 C CN 1327189C
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Abstract
The present invention provides a switch type digital displacement sensor, and relates to a sensing device which measures the displacement or the strain of objects. The present invention is characterized in that the present invention comprises a grid belt for representing graduations, and a switch component; the grid belt is fixed on one object which generates corresponding displacement; grids of the grid belt can be electric conduction grids, wherein the grids are respectively connected with a loop of a power supply in series; the loop of a power supply is broken in the positions of the grids; the switch component is fixed on the other object which generates corresponding displacement, and can be shifted to the grids of the grid belt along with the corresponding displacement generated by the two objects, the loop in which the grids are arranged is conducted, an electrical signal is output from the loop, and the electrical signal represents the corresponding displacement quantity of the two objects after treated. The present invention can accurately measure the corresponding displacement between the objects, can be suitable for poor working environments, and has the characteristics of high reliability, good stability and low cost.
Description
Technical field:
The present invention relates to a kind of sensing device that measures ohject displacement or strain.This device has the ability of influences such as very strong anti-electromagnetic interference (EMI) and resisting temperature, humidity variation, is applicable to the displacement measurement that range is bigger.
Background technology:
At present, the sensing device of existing a lot of Displacement Measurement and strain.These displacement sensing apparatus can be divided into analog and digital, mainly contain potentiometer, resistance-strain type, condenser type, inductance type, eddy current type, photo-electric and raster pattern, inductosyn formula and magnetic-grid-type etc.These sensing device technology are comparative maturity all, and under suitable working environment, its product can satisfy test request.(Huang Jichang, Xu Qiaoyu, Zhang Haigui etc., working sensor principle and application example, People's Telecon Publishing House, 1998 years.Dan Chengxiang, the theory of sensor and design basis and application thereof, National Defense Industry Press, 1999.)
For example common potentiometer is exactly a kind of simple and practical displacement transducer, its ultimate principle is to adopt a brush to slide on resistance, judge the position of brush according to changes in resistance in the circuit, obtain the displacement of object according to the relation of the displacement of brush and resistance.But, because the resistance of resistance changes with the temperature and humidity environment in the potentiometer, signal transmssion line resistance and also can cause error with variation of temperature, and judge that according to changes in resistance in the circuit its precision of displacement of brush (being object) is also limited, so there is bigger limitation in the application of potentiometer.
In many laboratories that relate to field measurement and environmental baseline complexity such as civil engineering work measured, the condition of work of displacement transducer was often relatively more abominable.The acute variation of external conditions such as temperature, humidity, pressure and electromagnetic interference (EMI) even outage etc. are had higher requirement to the job stability of displacement sensing apparatus.In many displacement measurement work of scientific research and engineering practice, also be difficult to obtain to measure the higher displacement transducer of job stability at present, even also possibly can't obtain measurement data.This mainly is because the antijamming capability of moment sensor is difficult to satisfy the requirement of these measurement environment.For example, pot, resistance-strain type etc. are responsive to temperature, humidity ratio, and the general shielding requirements of sensor of electromagnetic measurement principles such as condenser type, inductance type, magnetic-grid-type is higher, and these limitation all can reduce the reliability that displacement measures.
Summary of the invention:
In order to overcome the limitation that existing displacement sensing apparatus exists, satisfy the needs that scientific research and engineering practice displacement measure, the invention provides a kind of switching regulator displacement transducer of numeric type.The displacement sensor circuit of this displacement transducer only relates to and simply switches on and off relation.Drive slide mass by ohject displacement and slide on motherboard, slide mass different position on motherboard will provide different switching signals, can judge the position of slide mass on motherboard thus, the displacement that draws object to be detected.Because circuit signal is the digital signal of simply opening and closing, so sensor can adapt to bad working environment, the reliability height, and good stability, and cost is low.
The switching regulator displacement transducer of numeric type proposed by the invention is characterised in that: it contains a lattice belt (B) of representing scale that is fixed on the object that produces relative displacement, grid on this lattice belt (B) is conductive grid, and the width of grid equates with spacing; Side at this lattice belt (B) also is fixed with a conductive electrode (C) that insulate with lattice belt (B), this conductive electrode (C) is connected with a utmost point of power supply, opposite side at described conductive electrode (C) also is fixed with another and the lattice belt (A) that conductive electrode (C) insulate, and the grid on the lattice belt (A) is conductive grid; The width of the grid on the described lattice belt (A) is the even-multiple of the raster width on the described lattice belt (B), and the distance between the grid is less than the width of grid; Lattice belt (B) is gone up each grid and is connected with data handling system away from the lead that an end of conductive electrode (C) also passes through separately away from each grid that an end of conductive electrode (C) lead by separately is connected with data handling system on the described lattice belt (A); Also contain a switch block that is fixed on another object that produces relative displacement, described switch block is a conductive material slide plate (D), this switch block can be along with the relative displacement of two objects generations, move on the grid and conductive electrode (C) on lattice belt (A) and the lattice belt (B), formation is by the grid of lattice belt (B), the loop that conductive electrode (C) and data handling system constitute, with grid by lattice belt (A), the loop that conductive electrode (C) and data handling system constitute, export electric signal from these two loops, this electric signal is expressed the relative shift of two objects after treatment; The electric signal of the loop output at the grid place on the lattice belt (A) obtains the relatively large number of displacement measurement after treatment, and the electric signal of the loop output at the grid place on the lattice belt (B) obtains the relatively small number of displacement measurement after treatment.
The width of described conductive material slide plate (D) is 2 times of raster width on the described lattice belt (B).Between the grid on the described lattice belt (A) is shaped form or broken line shape at interval.
Another kind of switched mode digital displacement transducer, it is characterized in that, it contains a lattice belt (B) of representing scale that is fixed on the object that produces relative displacement, and the grid on this lattice belt (B) is the grid of photoelectric material, and the width of grid equates with spacing; Side at this lattice belt (B) is connected with a conductive electrode (C), and this conductive electrode (C) is connected with a utmost point of power supply, is connected with another lattice belt (A) at the opposite side of described conductive electrode (C), and the grid on the lattice belt (A) is the grid of photoelectric material; The width of the grid on the described lattice belt (A) is the even-multiple of the raster width on the described lattice belt (B), and the distance between the grid is less than the width of grid; Lattice belt (B) go up each grid away from an end of conductive electrode (C) respectively the conducting block (S) by separately be connected with data handling system, each grid on the described lattice belt (A) is connected with data handling system away from the conducting block (0) that an end of conductive electrode (C) also passes through separately respectively; Also contain a switch block that is fixed on another object that produces relative displacement, described switch block is an illuminating source, this illuminating source can be along with the relative displacement of two objects generations, move to the grid and conductive electrode (C) top of lattice belt (A) and lattice belt (B), make the grid on lattice belt (A) and the lattice belt (B) conduct electricity by irradiation, formation is by the grid of lattice belt (B), the loop that conductive electrode (C) and data handling system constitute, with grid by lattice belt (A), the loop that conductive electrode (C) and data handling system constitute, export electric signal from these two loops, this electric signal is expressed the relative shift of two objects after treatment; The electric signal of the loop output at the grid place on the lattice belt (A) obtains the relatively large number of displacement measurement after treatment, and the electric signal of the loop output at the grid place on the lattice belt (B) obtains the relatively small number of displacement measurement after treatment.
The width of the light that described light source sends is 2 times of raster width on the described lattice belt (B).Described light source is a generating laser.Between the grid on the described lattice belt (A) is shaped form or broken line shape at interval.
The switching regulator displacement transducer that experiment showed, numeric type proposed by the invention can accurately measure the relative displacement between object, and can adapt to bad working environment, the reliability height, and good stability, cost are also lower, have reached its intended purposes.
Description of drawings:
Fig. 1 is the enforcement illustration of contact formula numeric type switching regulator displacement transducer;
Fig. 2 is the theory diagram of the data processing circuit of numeric type switching regulator displacement transducer;
Fig. 3 is the enforcement illustration of photo-electric numeric type switching regulator displacement transducer.
Embodiment:
The basic thought of numeric type switching regulator displacement transducer proposed by the invention is: its displacement sensor circuit is made up of two parts, a part is to be fixed on a lattice belt on the object, another part is the switch block that is fixed on another object that produces relative displacement, the mobile drive slide mass (being switch block) of object is gone up at motherboard (being lattice belt) and is slided, slide mass different position on motherboard will provide different switching signals, can judge the position of slide mass on motherboard thus, the displacement that draws object to be detected.
The material that above-mentioned grid is used can be metallic conductor, and corresponding conductive material slide plate also uses metallic conductor; Grid also can use photoelectric material, and corresponding conductive material slide plate then substitutes with light source.
One. grid uses the displacement transducer of metallic conductor
1. in displacement transducer, only use grid B
As shown in Figure 1, plate grid B and electrode C on the non-conductive motherboard of strip, dash area is represented electric conductor, and non-shaded portion is non-conductive.Lattice belt B is fixed in company with motherboard on the object that produces relative displacement, and the width of each grid equates that spacing also equates, and raster width and spacing equivalence, as be 1 millimeter, C is the whole piece conductive electrode, be positioned at the side of lattice belt B, join with the utmost point of DC voltage, but do not contact with grid.D is the metal slide plate, and its width is the twice of B row grid, and it well contacts with the C electrode with the B grid.B row grid is handled another utmost point that the back connects DC voltage by lead through necessity respectively, has constituted many loops by each grid, direct supply on conductive electrode C and the B row like this, and the gap location of each loop between grid and conductive electrode C disconnects.When the original state displacement is zero, the left side snap of slide plate D left side and first grid of the right.When detecting displacement, slide plate D moves along with moving of object, in the time of on covering some grids, the loop conducting of this grid, produce electric signal in the loop, in the loop, connect lead-out terminal G, signal is outputed in the data processing circuit handle, can learn the position of slide plate D on motherboard, the distance that slide plate D slips over is the displacement that object produces.
The width of B grid and spacing can suitably be adjusted with actual needs, guarantee preferably during adjustment that the width of each grid equates, spacing also equates, and raster width and spacing equivalence.
No matter whenever, all want can be with on the B grid contacts slide plate D.If the situation of non-conductive position in the interval that the D slide plate can be in the B grid during less than the spacing of B grid, will appear in the width of slide plate D, at this moment slide plate D just can not provide the signal of grid B, causes data processed result error to occur.So D slide plate width is more preferably greater than the spacing of B grid.And for the facility in the sensor displacement judgement, the twice of the D slide plate being made B grid distance (the B grid is wide equidistantly) is the most convenient.
The conductive electrode C that is whole piece shape also can guarantee that slide plate D replaces with the method that a utmost point of power supply keeps being communicated with, and for example links to each other with slide plate D with the utmost point of a lead with power supply with other.When slide plate D slided, this lead kept being connected with slide plate D, and a utmost point of slide plate D and DC voltage is joined.
2. displacement transducer increases grid A on the basis of grid B
Only use above-mentioned grid B, can carry out the judgement of slide plate D position.But when the range of measuring when needs is big, the grid quantity on the B grid will be bigger, by the wiring of above-mentioned ultimate principle and signal Processing more complicated all, therefore propose a kind of range wiring and the fairly simple optimization method of signal Processing greatly the time.
As shown in Figure 1, on the basis of original lattice belt B, on the non-conductive motherboard of strip, plate row's electric conductor grid A again, grid A is positioned at the opposite side of conductive electrode C, each grid also is serially connected in the loop, disconnect (even-multiple that distance should be raster width on the B grid) between grid at a certain distance, as 10 millimeters.
The 1. grid B is made up of the identical unit of several structures, provided among Fig. 1, the 2. 3. part of a unit of a unit and the, and each unit is made up of 5 grids in this example.When slide plate D slides, can judge slide plate D is positioned on which grid of this unit in the B grid cell on grid B; Simultaneously, slide plate D also slides on grid A, and slide plate D is positioned on which unit of grid B according to differentiate at this moment in the position on the grid A.Therefore, can judge that by the signal of slide plate D slide plate D is positioned on which unit and which grid on this unit of grid B, thereby determine the position of slide plate D.
That is to say, the position judgment of slide plate is divided into two parts, the relatively large number (representing slide plate to be positioned at which unit) of part expression slide plate position, another part is represented the relatively small number (slide plate is positioned at which grid on the discrete cell) of slide plate position.Sensing device is judged the relatively large number and the relatively small number of slide plate position respectively, lumps together the position that just can determine slide plate.Then, according to the position of slide plate, demonstrate the displacement of object with data handling system and digital instrument.
And the width of A row grid only need guarantee that the overall width that equals a unit of B row's grid gets final product.Seam in the A grid between each grid is very narrow (much smaller than the width of A grid, use 1mm in this example), and make curve or broken line (as shown in fig. 1), be in order to guarantee that slide plate D is when slipping over two adjacent A grids, can contact these adjacent two A grids simultaneously, utilize single-chip microcomputer to judge this moment, slide plate D should belong to which piece in these two A grids according to the position judgment result on the grid B then.And if the A grid is done the same vertical curve of imaging B grid and disconnected, then when slide plate D slips over two adjacent A grids, just be easy to cause erroneous judgement.
3. the signal Processing of sensor
When carrying out displacement measurement, can use single-chip microcomputer to carry out signal analysis and processing.
Fig. 2 is the synoptic diagram that each grid lead-out terminal connects single-chip microcomputer among Fig. 1, and H is a single-chip microcomputer, and I is a microcontroller power supply, and J is the single-chip data acquisition point, and K is the single-chip data input end.L is the single-chip data output terminal, and M is a digital distance scope.
In original state, slide plate D displacement is zero, and this slide plate left side is also neat with the left side of first B grid of the right.Draw lead from A row's grid and B row grid, link to each other with an input pin of single-chip microcomputer respectively.Single-chip microcomputer can be judged the level signal on the lead-in wire.When slide plate D slides on motherboard, can cover the grid that is positioned at the same position place on A and the B, these two grid place loop conductings, during its circuit turn-on, extension line is a high level.Single-chip microcomputer has obtained the level signal of corresponding extension line, judges the position of slide plate D on A grid and B grid according to internal processes then, and then obtains the slide displacement of slide plate D on motherboard.
For the convenience on using, can also directly single-chip microcomputer be implanted in the sensor, and power supply only need be provided from the sensor outside, and the single-chip microcomputer data processed be exported by the interface of sensor.
Two. the grid conductive material is changed to the displacement transducer of photoelectric material
Another kind of embodiment is a (see figure 3): change A, B row grid material into photoelectric material, this material conducts electricity when irradiate light, and is non-conductive during unglazed the photograph; Slide plate D changed into be light source D, light source can be selected generating laser for use, and generating laser has characteristics such as light stability.The width of light is the twice of B row raster width.But this moment, conductive electrode C should contact with A, B row grid, and at the other end connection conducting block O of A grid, at the other end connection conducting block S of B grid, all the connected mode with above-mentioned contact formula is consistent for all the other, and data processing method is still constant during Displacement Measurement.Because light source D does not directly contact with each grid, and the size of photoelectric material grid can be very little, therefore can improve the reliability and the measuring accuracy of working sensor greatly.
Claims (7)
1, switched mode digital displacement transducer is characterized in that, it contains a lattice belt (B) of representing scale that is fixed on the object that produces relative displacement, and the grid on this lattice belt (B) is conductive grid, and the width of grid equates with spacing; Side at this lattice belt (B) also is fixed with a conductive electrode (C) that insulate with lattice belt (B), this conductive electrode (C) is connected with a utmost point of power supply, opposite side at described conductive electrode (C) also is fixed with another and the lattice belt (A) that conductive electrode (C) insulate, and the grid on the lattice belt (A) is conductive grid; The width of the grid on the described lattice belt (A) is the even-multiple of the raster width on the described lattice belt (B), and the distance between the grid is less than the width of grid; Lattice belt (B) is gone up each grid and is connected with data handling system away from the lead that an end of conductive electrode (C) also passes through separately away from each grid that an end of conductive electrode (C) lead by separately is connected with data handling system on the described lattice belt (A); Also contain a switch block that is fixed on another object that produces relative displacement, described switch block is a conductive material slide plate (D), this switch block can be along with the relative displacement of two objects generations, move on the grid and conductive electrode (C) on lattice belt (A) and the lattice belt (B), formation is by the grid of lattice belt (B), the loop that conductive electrode (C) and data handling system constitute, with grid by lattice belt (A), the loop that conductive electrode (C) and data handling system constitute, export electric signal from these two loops, this electric signal is expressed the relative shift of two objects after treatment; The electric signal of the loop output at the grid place on the lattice belt (A) obtains the relatively large number of displacement measurement after treatment, and the electric signal of the loop output at the grid place on the lattice belt (B) obtains the relatively small number of displacement measurement after treatment.
2, switched mode digital displacement transducer as claimed in claim 1 is characterized in that, the width of described conductive material slide plate (D) is 2 times of raster width on the described lattice belt (B).
3, switched mode digital displacement transducer as claimed in claim 1 is characterized in that, between the grid on the described lattice belt (A) is shaped form or broken line shape at interval.
4, switched mode digital displacement transducer as claimed in claim 1, it is characterized in that, it contains a lattice belt (B) of representing scale that is fixed on the object that produces relative displacement, and the grid on this lattice belt (B) is the grid of photoelectric material, and the width of grid equates with spacing; Side at this lattice belt (B) is connected with a conductive electrode (C), and this conductive electrode (C) is connected with a utmost point of power supply, is connected with another lattice belt (A) at the opposite side of described conductive electrode (C), and the grid on the lattice belt (A) is the grid of photoelectric material; The width of the grid on the described lattice belt (A) is the even-multiple of the raster width on the described lattice belt (B), and the distance between the grid is less than the width of grid; Lattice belt (B) go up each grid away from an end of conductive electrode (C) respectively the conducting block (S) by separately be connected with data handling system, each grid on the described lattice belt (A) is connected with data handling system away from the conducting block (O) that an end of conductive electrode (C) also passes through separately respectively; Also contain a switch block that is fixed on another object that produces relative displacement, described switch block is an illuminating source, this illuminating source can be along with the relative displacement of two objects generations, move to the grid and conductive electrode (C) top of lattice belt (A) and lattice belt (B), make the grid on lattice belt (A) and the lattice belt (B) conduct electricity by irradiation, formation is by the grid of lattice belt (B), the loop that conductive electrode (C) and data handling system constitute, with grid by lattice belt (A), the loop that conductive electrode (C) and data handling system constitute, export electric signal from these two loops, this electric signal is expressed the relative shift of two objects after treatment; The electric signal of the loop output at the grid place on the lattice belt (A) obtains the relatively large number of displacement measurement after treatment, and the electric signal of the loop output at the grid place on the lattice belt (B) obtains the relatively small number of displacement measurement after treatment.
5, switched mode digital displacement transducer as claimed in claim 4 is characterized in that, the width of the light that described light source sends is 2 times of raster width on the described lattice belt (B).
6, switched mode digital displacement transducer as claimed in claim 4 is characterized in that, described light source is a generating laser.
7, switched mode digital displacement transducer as claimed in claim 4 is characterized in that, between the grid on the described lattice belt (A) is shaped form or broken line shape at interval.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100119558A CN1327189C (en) | 2005-06-17 | 2005-06-17 | Switched mode digital displacement transducer |
| PCT/CN2006/001347 WO2006133648A1 (en) | 2005-06-17 | 2006-06-15 | Switched mode digital displacement transducer and its application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100119558A CN1327189C (en) | 2005-06-17 | 2005-06-17 | Switched mode digital displacement transducer |
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| Publication Number | Publication Date |
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| CN1696601A CN1696601A (en) | 2005-11-16 |
| CN1327189C true CN1327189C (en) | 2007-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100119558A Expired - Fee Related CN1327189C (en) | 2005-06-17 | 2005-06-17 | Switched mode digital displacement transducer |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5475304A (en) * | 1993-10-01 | 1995-12-12 | The United States Of America As Represented By The Secretary Of The Navy | Magnetoresistive linear displacement sensor, angular displacement sensor, and variable resistor using a moving domain wall |
| CN2246791Y (en) * | 1995-08-28 | 1997-02-05 | 上海量具刃具厂 | High-resolution condenser coupling displacement measuring transducer |
| CN1229939A (en) * | 1998-03-22 | 1999-09-29 | 梁志勇 | Switching edge displacement controller |
| CN2615636Y (en) * | 2003-02-10 | 2004-05-12 | 徐传仁 | Digital approach displacement transducer |
-
2005
- 2005-06-17 CN CNB2005100119558A patent/CN1327189C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5475304A (en) * | 1993-10-01 | 1995-12-12 | The United States Of America As Represented By The Secretary Of The Navy | Magnetoresistive linear displacement sensor, angular displacement sensor, and variable resistor using a moving domain wall |
| CN2246791Y (en) * | 1995-08-28 | 1997-02-05 | 上海量具刃具厂 | High-resolution condenser coupling displacement measuring transducer |
| CN1229939A (en) * | 1998-03-22 | 1999-09-29 | 梁志勇 | Switching edge displacement controller |
| CN2615636Y (en) * | 2003-02-10 | 2004-05-12 | 徐传仁 | Digital approach displacement transducer |
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| CN1696601A (en) | 2005-11-16 |
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