CN108050939A - A kind of displacement detector - Google Patents
A kind of displacement detector Download PDFInfo
- Publication number
- CN108050939A CN108050939A CN201711278032.8A CN201711278032A CN108050939A CN 108050939 A CN108050939 A CN 108050939A CN 201711278032 A CN201711278032 A CN 201711278032A CN 108050939 A CN108050939 A CN 108050939A
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- CN
- China
- Prior art keywords
- camera
- light
- conversion device
- under test
- object under
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
Abstract
The present invention relates to a kind of displacement detector, solution is the technical issues of measurement needs contact, and by using including radio-frequency signal source, radio-frequency signal source output is connected with directly modulated lasers；Parallel light conversion device is connected with directly modulated lasers, parallel light conversion device is correspondingly arranged with object under test, parallel light conversion device is equipped with light-transmitting plate compared with the symmetrical another side of object under test, camera is correspondingly arranged on after light-transmitting plate, camera is connected with post-processing unit and the power module for power supply；The picture that the post-processing unit shoots camera carries out overlapping comparison and size marking；The parallel light conversion device output light scope is more than object under test size；The object under test is the technical solution of light tight material, preferably resolves the problem, in being measured available for light tight ohject displacement.
Description
Technical field
The present invention relates to electron displacement detection fields, and in particular to a kind of displacement detector.
Background technology
The displacement of object under test is measured, the mechanical value measuring of displacement of the lines or angular displacement when measuring translation of rigid body or rotating
Instrument, for measuring the geometric parameter of mechanical displacement, component of machine, including size, surface shape etc. and in process
In continuously measure the physical dimension of steel plate, paper and rubber etc..Displacement measuring instrument is by displacement sensor, measuring circuit and indicator
It is formed Deng part.Displacement sensor can be divided into analog displacement sensor and digital displacement transducer by the type of output signal
Two classes.
Optical fibre displacement sensor mainly has fiber grating, the sensing of the types such as Fabry-perot optical fiber and Fiber-M-Z interferometer at present
Device.The contact type mechanical measurement or carry out displacement measurement using principle of reflection that technology of the prior art uses, the present invention carries
For a kind of new displacement measuring device.It disclosure satisfy that the purpose of non-contact displacement measurement.
The content of the invention
The technical problems to be solved by the invention are the technical issues of measurement in the prior art need contact.It provides
A kind of new displacement detector, the displacement detector have the characteristics that contactless, measurement is simple.
In order to solve the above technical problems, the technical solution used is as follows：
A kind of displacement detector, institute's displacement sensing device include radio-frequency signal source, and radio-frequency signal source output is connected with
Directly modulated lasers；Parallel light conversion device is connected with directly modulated lasers, parallel light conversion device is correspondingly arranged with object under test,
Parallel light conversion device is equipped with light-transmitting plate compared with the symmetrical another side of object under test, and camera, phase are correspondingly arranged on after light-transmitting plate
Machine is connected with post-processing unit and the power module for power supply；
The picture that the post-processing unit shoots camera carries out overlapping comparison and size marking；
The parallel light conversion device output light scope is more than object under test size；
The object under test is light tight.
The operation principle of the present invention：The present invention uses the principle of camera exposure, and one strong expose is formed at object under test
Luminous environment is taken pictures using camera, and for object under test because light tight, the image on photo is black, and rest part is white.
By front and rear shooting photo twice, coincidence comparison is carried out to photo, intersection is removed from the big photo of shade size.It is right
Dimensional measurement is carried out in residual image, the displacement of object under test can be measured.Processing procedure includes taking existing image anti-
Turn, pixel grey scale processing, carry out coordinate calculating by setting dot coordinate, then calculate residual image size.
In said program, for optimization, further, the parallel light conversion device includes sleeve, is set through sleeve one end
There is light emitting single mode optical fiber, be connected to be equipped with optical cable in the sleeve and be connected with optical cable with light emitting single mode optical fiber and be arranged on
Beam-expanding collimation lens in sleeve；The sleeve is light tight sleeve.
Further, the radio-frequency signal source includes radio-frequency signal generator, the coupling being connected with radio-frequency signal generator
Device, coupler main road output terminal connection directly modulated lasers, coupler coupled output feed back to radio-frequency signal generator control terminal.
Further, the post-processing unit includes processor, memory, video frequency collection card and communication unit, communication
Unit is connected with camera.
Further, the camera is high speed camera.
Further, institute's displacement sensing device periphery is equipped with light tight shell.
Further, institute's displacement sensing device further includes cooling device.
The present invention can reduce interference of the external light source to test device test result by using whole half-light environment,
Improve measuring accuracy.By setting cooling device, operating temperature can be controlled, improves the service life of optical device.
Beneficial effects of the present invention：
Effect one realizes non-contact displacement measurement；
Effect two, measurement is simple, few using equipment, of low cost；
Effect three can carry out radio-frequency signal source feedback control, easy to use.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1, displacement measuring device schematic diagram in embodiment 1.
Fig. 2, parallel light conversion device schematic diagram.
Fig. 3, post-processing unit schematic diagram.
1- beam-expanding collimation lens, 2- sleeves.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that specific embodiment described herein is not used to limit only to explain the present invention
The fixed present invention.
Embodiment 1
The present embodiment provides a kind of displacement detector, such as Fig. 1, institute's displacement sensing device includes radio-frequency signal source, penetrates
Frequency source signal output is connected with directly modulated lasers；Parallel light conversion device, parallel light conversion device are connected with directly modulated lasers
It is correspondingly arranged with object under test, parallel light conversion device is equipped with light-transmitting plate, light-transmitting plate compared with the symmetrical another side of object under test
After be correspondingly arranged on camera, camera is connected with post-processing unit and the power module for power supply；The post-processing unit
The picture that camera is shot is carried out to overlap comparison and size marking；The parallel light conversion device output light scope is more than determinand
Body size；The object under test is light tight.
Wherein, radio-frequency signal source can adjust signal output amplitude and frequency, so as to which directly modulated lasers be controlled to export, and then
The capability control of light exposure is completed, the test environment of a variety of exposure intensities is provided.Camera is equal using black and white camera or color camera
It can.The present embodiment selects industrial black and white camera, special CCD camera XC-ES30CE types, has small, and low energy consumption, shockproof good
Advantage, pixel energy meet precision needs.XC-ES30CE resolution ratio 752 (H) x582 (V), XC-ES30CE camera external appearances and connects
Mouth function：C-type interface connection lens；Camera mounting hole, fixed hole position precision are constrained by camera sensor high-precision requirement；Camera
Reference bore is installed, 12 core spininess connection socket has DC power supply, synchronizing signal, vision signal；75W terminals choosing switch；HD/VD is defeated
Enter output selector switch；The DIP switch that shutter speed/mode is set include setting shutter speed key, selection frame or field picture key,
Selection triggering shutter key, selection calibration function switch key, selection gain key.
The workflow of the present embodiment：Parallel light conversion device is put into designated position corresponding with object under test, another
Camera is set on one side, camera is connected to post-processing unit；Displacement detector is opened, camera is repeatedly shot, by captured image
It passes to post-processing unit and carries out displacement measurement calculating.The method that displacement measurement calculates is using coincidence pattern picture is subtracted, to residual image
The method for carrying out dimensional measurement obtains displacement parameter.Processor control camera is shot.
Specifically, such as Fig. 2, the parallel light conversion device includes sleeve 2, through 2 one end of sleeve equipped with light emitting single mode
Optical fiber is connected in sleeve 2 equipped with optical cable with light emitting single mode optical fiber and the expansion being arranged in sleeve 2 is connected with optical cable
Beam collimation lens 1；The sleeve 2 is light tight sleeve.
Preferably, the radio-frequency signal source is including radio-frequency signal generator, the coupler being connected with radio-frequency signal generator,
Coupler main road output terminal connects directly modulated lasers, and coupler coupled output feeds back to radio-frequency signal generator control terminal.Energy
It is enough that radio-frequency signal source is controlled in real time, adapt to the exposure intensity needs of displacement detector.
Specifically, such as Fig. 3, the post-processing unit includes processor, memory, video frequency collection card and communication unit,
Communication unit is connected with camera.Processor controls camera to be shot according to internal clocking, the contact bat when needing to test displacement
Take the photograph 2 times and more than, can pass through the method for averaging carry out precision raising.
Video frequency collection card can be divided into broadcast level video frequency collection card, professional video frequency collection card, civil according to its purposes
Video frequency collection card.The image index of their difference mainly acquisition is different, and video acquisition is exactly by the analog signal of video source
Digital code information is transformed by processing, and these digital code informations are stored in the process on computer hard disc.It is used in the present embodiment
2 analog video capture cards of Picolo Pro be that there is high cost performance, the input signal of 4 cameras can be received.It is carried
Four BNC composite video input adapters, can be simultaneously from four camera acquisition images that resolution ratio is 768x 576 (PAL).
The video frequency collection card gathers the switching of multichannel input signal multichannel PAL video cameras input using dedicated signal handoff technique in turn
Delay is then less than 33ms less than 40ms, NTSC video cameras.
To make the test interval shorter, it is preferable that the camera is high speed camera.
In order to improve measurement accuracy, the interference of exterior light is excluded, it is preferable that institute's displacement sensing device periphery is equipped with impermeable
Light shell.
Embodiment 2
The present embodiment adds in cooling device on the basis of embodiment 1, and optical device can be ensured by adding in cooling device
Operating temperature improves the service life of detection device in normal range (NR).
Although the illustrative specific embodiment of the present invention is described above, in order to the technology of the art
Personnel are it will be appreciated that the present invention, but the present invention is not limited only to the scope of specific embodiment, to the common skill of the art
For art personnel, as long as long as various change appended claim limit and definite spirit and scope of the invention in, one
The innovation and creation using present inventive concept are cut in the row of protection.
Claims (7)
1. a kind of displacement detector, it is characterised in that：Institute's displacement sensing device includes radio-frequency signal source, and radio-frequency signal source is defeated
Go out to be connected with directly modulated lasers；Parallel light conversion device, parallel light conversion device and object under test are connected with directly modulated lasers
It is correspondingly arranged, parallel light conversion device is equipped with light-transmitting plate compared with the symmetrical another side of object under test, is correspondingly arranged after light-transmitting plate
There is camera, camera is connected with post-processing unit and the power module for power supply；
The picture that the post-processing unit shoots camera carries out overlapping comparison and size marking；
The parallel light conversion device output light scope is more than object under test size；
The object under test is light tight material.
2. displacement detector according to claim 1, it is characterised in that：The parallel light conversion device includes sleeve
(2), light emitting single mode optical fiber is equipped with through sleeve (2) one end, is connected with light emitting single mode optical fiber in sleeve (2) and is equipped with light
Cable and the beam-expanding collimation lens (1) being arranged in sleeve (2) are connected with optical cable；The sleeve (2) is light tight sleeve.
3. displacement detector according to claim 2, it is characterised in that：The radio-frequency signal source is sent out including radiofrequency signal
Raw device, the coupler being connected with radio-frequency signal generator, coupler main road output terminal connection directly modulated lasers, coupler coupling are defeated
Outlet feeds back to radio-frequency signal generator control terminal.
4. displacement detector according to claim 1, it is characterised in that：The post-processing unit includes processor, deposits
Reservoir, video frequency collection card and communication unit, communication unit are connected with camera.
5. displacement detector according to claim 1, it is characterised in that：The camera is high speed camera.
6. displacement detector according to claim 1, it is characterised in that：Institute's displacement sensing device periphery is equipped with impermeable
Light shell.
7. displacement detector according to claim 6, it is characterised in that：Institute's displacement sensing device further includes cooling dress
It puts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711278032.8A CN108050939A (en) | 2017-12-06 | 2017-12-06 | A kind of displacement detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711278032.8A CN108050939A (en) | 2017-12-06 | 2017-12-06 | A kind of displacement detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108050939A true CN108050939A (en) | 2018-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711278032.8A Withdrawn CN108050939A (en) | 2017-12-06 | 2017-12-06 | A kind of displacement detector |
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| Country | Link |
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| CN (1) | CN108050939A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111442726A (en) * | 2020-02-28 | 2020-07-24 | 南京南瑞水利水电科技有限公司 | Photoelectric displacement device based on Fresnel lens |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6369401B1 (en) * | 1999-09-10 | 2002-04-09 | Agri-Tech, Inc. | Three-dimensional optical volume measurement for objects to be categorized |
| CN1844844A (en) * | 2006-05-17 | 2006-10-11 | 中国科学院上海光学精密机械研究所 | Apparatus and method for measuring micro-displacement by femtosecond laser speckle correlation method |
| CN101788269A (en) * | 2010-03-22 | 2010-07-28 | 西安交通大学 | Displacement measuring device with reference and measuring method |
| JP2014006134A (en) * | 2012-06-25 | 2014-01-16 | Keyence Corp | Optical measurement device |
| CN104567699A (en) * | 2013-10-21 | 2015-04-29 | 中冶建筑研究总院有限公司 | Enhanced non-contact plumb line coordinator |
| CN106949838A (en) * | 2017-03-17 | 2017-07-14 | 张家港市欧微自动化研发有限公司 | A kind of optic fiber displacement sensor system |
-
2017
- 2017-12-06 CN CN201711278032.8A patent/CN108050939A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6369401B1 (en) * | 1999-09-10 | 2002-04-09 | Agri-Tech, Inc. | Three-dimensional optical volume measurement for objects to be categorized |
| CN1844844A (en) * | 2006-05-17 | 2006-10-11 | 中国科学院上海光学精密机械研究所 | Apparatus and method for measuring micro-displacement by femtosecond laser speckle correlation method |
| CN101788269A (en) * | 2010-03-22 | 2010-07-28 | 西安交通大学 | Displacement measuring device with reference and measuring method |
| JP2014006134A (en) * | 2012-06-25 | 2014-01-16 | Keyence Corp | Optical measurement device |
| CN104567699A (en) * | 2013-10-21 | 2015-04-29 | 中冶建筑研究总院有限公司 | Enhanced non-contact plumb line coordinator |
| CN106949838A (en) * | 2017-03-17 | 2017-07-14 | 张家港市欧微自动化研发有限公司 | A kind of optic fiber displacement sensor system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111442726A (en) * | 2020-02-28 | 2020-07-24 | 南京南瑞水利水电科技有限公司 | Photoelectric displacement device based on Fresnel lens |
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Application publication date: 20180518 |