CN206193021U - Spatial filtering speed sensor based on digit micro mirror - Google Patents
Spatial filtering speed sensor based on digit micro mirror Download PDFInfo
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- CN206193021U CN206193021U CN201621211987.2U CN201621211987U CN206193021U CN 206193021 U CN206193021 U CN 206193021U CN 201621211987 U CN201621211987 U CN 201621211987U CN 206193021 U CN206193021 U CN 206193021U
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- dmd
- processing board
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Abstract
The utility model discloses a spatial filtering speed sensor based on digit micro mirror, it includes light source, collimating lens, moving object, lens, digital micromirror device, focusing lens, drive circuit, photoelectric detector, differential circuit, signal processing board, drive circuit and PC, its working process is that digital micromirror device carries out filtering to incident ray on projecting digital micromirror device with the picture that the object became. Incide photoelectric detector after the light signal line focus of filtering, photoelectric detector becomes the signal of telecommunication with light signal conversion. The object speed that signal processing board obtained after handling. The utility model provides a figure adjustable problem not of interval and the grating of grating in the current spatial filtering speed sensor to the share is two sets of when spatial filtering, has eliminated partly interference, provides the spatial filtering speed sensor of a high accuracy.
Description
Technical field
The utility model is related to space filtering to test the speed field, and particularly a kind of space filtering based on digital micro-mirror tests the speed dress
Put.
Background technology
The basic conception that space filtering tests the speed derives from aerial camera control technology and infrared optics tracking technique.One kind is adopted
With the Imaging enhanced method of filtering process, its theoretical foundation is spatial convoluted.Purpose is to improve the quality of image, including removal high frequency
Noise and interference, and image edge enhancement, linear enhancing and deblurring etc..Optical measurement speed has non-compared with conventional method
Often important advantage, such as noncontact, non-interference.Space filtering technology can be used for measurement steamer, automobile, aircraft, rocket, wind-force
The velocity measuring of the solids such as generator, Steam Screw, aircraft rotary shaft；Liquid object in current, blood flow, building site mixer
The velocity measuring of the liquid objects such as material, and the gaseous state thing such as dust, typhoon velocity measuring.
The basic thought of space filtering is the optical imagery that mobile object is observed by the grid with parallel slits.It is existing
Space filtering test the speed usually using a light emitting source, lens, the parallel grating and optical signal prosessing plate of fixed range enter
Row measuring speed.The certainty of measurement of this method is fixed, it is impossible to adjusted, and causes the certainty of measurement of system single.GPS and DGPS side
The sample rate of method is too low, does not catch up with the object of quick motion.Acoustics or optical triangulation all provide position data speed very high
Rate, has the disadvantage that it needs external reception, and this limits it can only be in some square of use in meter level region.
It is all by absorbing image and then the side with software that space filtering based on CCD or cmos image sensor tests the speed
Method draws the movement velocity of object.Imageing sensor is tested the speed using correlation Particle tracking/PIV or space filtering（SFV）Come with
The motion of track patterned surface.When not having artificial light, image can be because the high dynamic between positive light and shade switches and causes
Partial exposure is not enough or overexposure.
Utility model content
The purpose of this utility model is directed to existing space filtering and tests the speed that sample rate is low, and filtering parameter is nonadjustable not
Foot, the utility model proposes a kind of space filtering velocity measuring device based on digital micro-mirror, the invention device can adjust
The filtering parameter of spatial filter, and the precision of space filtering measuring speed can be significantly improved.
The utility model purpose is realized in：
A kind of space filtering measuring speed device based on digital micro-mirror, the device includes：
Light source, for irradiating moving object；
Collimation lens, is connected with light source optical path, and the light that light source is sent first focuses on uniform irradiation after collimating again and transported tested
Animal body surface；
Lens, are connected with moving object, and moving object is imaged, and are incided on DMD；
DMD, is connected with lens, and by controlling the switch of micro mirror, the small eyeglass on DMD passes through
Deflection, can form two groups of gratings with parallel spacing, and two groups of parallel gratings can be as spatial filter to incident light
Signal is filtered, while by optical signal launch to photodetector.
Condenser lens, is connected with DMD, and the optical signal that DMD is reflected is focused on, and incides light
On electric explorer.
Photodetector, is connected with condenser lens, receives the optical signal of condenser lens focusing, the change meeting of light signal strength
Cause the voltage change of photodetector, so far just optical signal can be changed into electric signal；
Difference channel, photodetector connection, receive photodetector signal, to be input into two ends signal subtraction simultaneously
Amplify, eliminate most of extraneous unwanted signals.The signal input signal process plate that will amplify afterwards.
Signal-processing board, is connected with photodetector, PC, drive circuit, receives the electric signal from optical sensor, first
The analog electrical signal of reception is first converted into digital electric signal, the FPGA in signal-processing board draws to digital Electric signal processing
The movement velocity of object.
Drive circuit, is connected with signal-processing board, receives the signal from signal-processing board, drives DMD work
Make.
PC, is connected with signal-processing board, the mode of operation of control signal process plate, and receives from signal-processing board
Signal.
Eyeglass on the DMD can be deflected independently, be set to two groups and alternately deflected, and form two groups of spaces
Wave filter.
The signal-processing board includes MCU, FPGA and A/D module, and wherein A/D module is connected with FPGA, and MCU and FPGA connects
Connect；MCU receives the command signal from PC to FPGA, and the state of FPGA is returned into PC；A/D module is by difference channel
The signal of input is converted into digital data transmission to FPGA；FPGA is processed the data signal.
Described device tests the speed and comprises the following steps：
1）Signal-processing board power-up initializing, PC sets its working condition；Passed according to PC after signal-processing board work
The parameter for entering will control the incoming drive circuit of signal of DMD；
2）Drive circuit is initialized according to incoming signal and sets the working condition of DMD, digital micromirror device
Part controls the switch and eyeglass of small eyeglass to rotate, and forms it into two groups of parallel gratings；
3）Open light source；
4）Collimation lens first focuses on the light of light source after collimating again and is evenly radiated into testee surface；
5）The optical signal packet of the moving object imaging of reception is reflexed to photodetector by DMD；
6）After photodetector receives the optical signal of DMD reflection, optical signal is changed into electric signal, and
Electric signal is sent on difference channel；
7）Difference channel receives the signal of photodetector, and input signal process plate after processing it；
8）Signal-processing board receives the electric signal of difference channel, and A/D module converts electrical signals into data signal, signal
Process plate shows result output to PC to obtaining the movement velocity of object after Digital Signal Processing.
Compared with prior art, the beneficial effect of the utility model device is：
1st, the utility model is that space filtering is realized on the basis of hardware, and filtering parameter can be adjusted, and is made
The precision of system is greatly improved；
2nd, the lattice structure of present apparatus combination DMD flexibility and changeability, the speed for increasing object of which movement is surveyed
Amount scope.
Brief description of the drawings
Fig. 1 is the utility model structural representation；
Fig. 2 is the utility model structured flowchart；
Fig. 3 is the working state schematic representation of the utility model DMD；
Fig. 4 is utility model works flow chart；
Fig. 5 is the utility model signal-processing board structured flowchart.
Specific embodiment
Refering to Fig. 1-2, the utility model is made up of optical system a and signal transacting b, wherein, optical system a includes：Light
Source 1, moving object 3, collimation lens 2, lens 4, DMD 5, condenser lens 6 and drive circuit 10；Signal transacting b
Including：Photodetector 7, difference channel 8, signal-processing board 9 and PC 11.Specific works implementation process：Signal-processing board 9 with
PC 11, drive circuit 10 are connected, and PC is communicated with by the MCU on signal-processing board 9, set its working condition, signal
After process plate 9 is started working, control drive circuit 9 sets the working method of DMD 5.The light source 1 is used to irradiate
Moving object 3；Collimation lens 2 is connected with light source optical path, and the light that light source 1 is sent first focuses on uniform irradiation after collimating again and is being tested
The surface of moving object 3；Lens 4 are connected with the light path of moving object 3, and moving object 3 is imaged, and incide DMD 5
On；DMD 5 is connected with lens 4, there is up to million micro mirrors that can be controlled with sub-thread, work on DMD 5
The DMD of operation mode can be alternatively formed two groups of gratings with parallel spacing, and two groups of parallel gratings can be as sky
Between wave filter incident optical signal is filtered.Condenser lens 6 is connected with DMD 5, and DMD 5 is anti-
The optical signal penetrated is focused on, and is incided on photodetector 7；Photodetector 7 is connected with condenser lens 6, collectiong focusing lens 6
The optical signal of focusing, the change of light signal strength can cause the voltage change of photodetector 7, and optical signal is changed into telecommunications
Number；Difference channel 8 is connected with photodetector 7, receive photodetector 7 signal, to be input into two ends signal subtraction simultaneously
Amplify, eliminate the signal transmission that will amplify after most of extraneous unwanted signals, signal-processing board 9 is received from difference channel 8
Electric signal, is converted to digital electric signal by the analog electrical signal of reception first, and the FPGA in signal-processing board 9 is to digital electric signal
Treatment, draws the movement velocity of moving object 3, and speed of moving body result is transferred into PC and show.
Embodiment
By taking the bead for moving as an example, refering to Fig. 4, specific work process of the present utility model：
Power-up initializing, PC 11 is communicated by MCU with signal-processing board 9, the mode of operation of setting signal process plate 9,
After signal-processing board 9 is started working, the signal of the mode of operation of DMD 5 will be controlled to be sent to drive circuit 10, driven
Circuit 10 drives DMD 5 to work, and deflects the tiny mirror on DMD 5, forms two groups of gratings.Light
Source 1 is incided on collimation lens 2, and light source 1 is become parallel rays and incided on bead 3 by collimation lens 2, and bead 3 passes through lens 4
Imaging, imaging is incided on DMD 5, and DMD 5 reflexes to the picture packet of incident bead 2 poly-
On focus lens 6, incident optical signal is focused on and incides photodetector 7 by condenser lens 6, and photodetector 7 is by incident light
Signal is converted into electric signal and is input to difference channel 8, and difference channel 8 is to being input to signal-processing board 9 after signal transacting.At signal
Incoming analog electrical signal is converted into digital electric signal by reason plate 9, and signal-processing board draws the speed of bead 3 after processing it,
PC 11 is conveyed to show.
Refering to Fig. 3, the micromirror duty process schematic of the utility model DMD 5；A represents digital micro-mirror in figure
A micro mirror on device 5, each micro mirror can be controlled to be deflected to two different directions from input electrical signal, respectively
Correspondence "ON" and "Off" state.Therefore the yawing moment for controlling micro mirror with input electrical signal can be just realized to input optical signal
Modulation, when micro mirror is in "On" state, input optical signal is reflected, and represents output " 1 "；When micro mirror is in "Off" state
When, input optical signal is absorbed by light absorbs face, does not have optical signal to export, and represents output " 0 ".
Refering to Fig. 4, after upper electricity, signal-processing board performs initialization program, and PC communicates with the MCU on signal-processing board,
Configuration work mode.Drive circuit receives the signal of signal-processing board, initializes and configure the working condition of DMD,
Small eyeglass switch and deflection above control DMD.Moving object imaging incides DMD
Afterwards, DMD is filtered to optical signal.Signal after being filtered is input to difference channel through photodetector, poor
Input signal process plate after parallel circuit treatment, signal-processing board is to drawing the speed of moving object and exporting to PC after signal transacting
On machine.
Refering to Fig. 5, signal-processing board of the present utility model 9 includes MCU（STM3F130VCT6）、FPGA
And AD (AD7714) module (XC6SLX150FGG676).MCU receives the command signal from PC to FPGA by USB interface,
And the state of FPGA is returned into PC.The signal that difference channel is input into is converted into digital data transmission to FPGA by AD；FPGA
Data signal to AD outputs is processed.
Claims (3)
1. a kind of space filtering speed measuring device based on digital micro-mirror, it is characterised in that the device includes：
Light source（1）, the light source for producing irradiation moving object；
Collimation lens（2）, with light source（1）Light path is connected, and the light that light source is sent first focuses on uniform irradiation after collimating again and is being tested
Surface of moving object；
Moving object（3）, with collimation lens（2）Connection, receives by collimation lens（2）Light after collimation；
Lens（4）, with moving object（3）Testee, is imaged on DMD by connection（5）On；
DMD（5）, with lens（4）Connection, the picture of the moving object that will be received is divided to two groups to reflect away；
Condenser lens（6）, with DMD（5）Connection, receives the optical signal of digital micro-mirror reflection, and optical signal is gathered
It is burnt；
Photodetector（7）, with condenser lens（6）Connection, the optical signal of collectiong focusing lens focus, and optical signal is changed into
Electric signal；
Difference channel（8）, with photodetector（7）Connection, receives the electric signal of photodetector output, amplifies difference mode signal,
Suppression common mode signal；
Signal-processing board（9）, with difference channel（8）Connection, receives difference channel（8）The electric signal of output；
Drive circuit（10）, with DMD（5）And signal-processing board（9）Connection, is controlled by signal-processing board, receives letter
The signal of number process plate, drives DMD（5）, initialize and set DMD（5）Working condition；
PC（11）, with signal-processing board（9）Connection, initializing signal process plate（9）Working condition and receive signal transacting
Plate（9）Output.
2. speed measuring device according to claim 1, it is characterised in that the DMD（5）On eyeglass can be only
Vertical deflection, is set to two groups and alternately deflects, and forms two groups of space filtering forms.
3. speed measuring device according to claim 1, it is characterised in that signal-processing board（9）Including MCU, FPGA and AD mould
Block, wherein A/D module are connected with FPGA, and MCU is connected with FPGA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621211987.2U CN206193021U (en) | 2016-11-10 | 2016-11-10 | Spatial filtering speed sensor based on digit micro mirror |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621211987.2U CN206193021U (en) | 2016-11-10 | 2016-11-10 | Spatial filtering speed sensor based on digit micro mirror |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206193021U true CN206193021U (en) | 2017-05-24 |
Family
ID=58735323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621211987.2U Expired - Fee Related CN206193021U (en) | 2016-11-10 | 2016-11-10 | Spatial filtering speed sensor based on digit micro mirror |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111273054A (en) * | 2018-12-05 | 2020-06-12 | 西卡西伯特博士及屈恩有限及两合公司 | Flow measuring method and flow measuring device for optical flow measurement |
-
2016
- 2016-11-10 CN CN201621211987.2U patent/CN206193021U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111273054A (en) * | 2018-12-05 | 2020-06-12 | 西卡西伯特博士及屈恩有限及两合公司 | Flow measuring method and flow measuring device for optical flow measurement |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170524 Termination date: 20171110 |
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| CF01 | Termination of patent right due to non-payment of annual fee |