CN1763546A - Imaging system of particle image velocimetry for gray scale statistics, discrimination and query - Google Patents
Imaging system of particle image velocimetry for gray scale statistics, discrimination and query Download PDFInfo
- Publication number
- CN1763546A CN1763546A CN 200510030965 CN200510030965A CN1763546A CN 1763546 A CN1763546 A CN 1763546A CN 200510030965 CN200510030965 CN 200510030965 CN 200510030965 A CN200510030965 A CN 200510030965A CN 1763546 A CN1763546 A CN 1763546A
- Authority
- CN
- China
- Prior art keywords
- acousto
- optic modulator
- lens
- convex lens
- laser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention discloses a particle velocity field imaging system for grey scale statistical discrimination inquiry in the laser measuring technique domain, which comprises the following parts: semiconductor pump continuous laser, acousto-optic modulator, baffle, lens combination, camera, computer and digit synchronization generator, wherein the semiconductor pump continuous laser emits continuous laser beam, which is modulated into different breadth, frequency and strength laser impulse through the acousto-optic modulator as section of optical back illumination detected flow field through lens combination; the camera records flow field particle image and sends to the computer.
Description
Technical field
What the present invention relates to is particle picture velocity field instrument imaging system, and particularly a kind of particle picture velocity field instrument imaging system that is used for the gray-scale statistics classification inquiry belongs to the laser measuring technique field.
Background technology
Particle picture velocity field instrument PIV (Particle Image Velocimetry) is a kind of brand-new fluid-velocity survey instrument that closely grows up during the last ten years, it melts Computer Image Processing and optical technology is an one, becomes a very effective instrument of flow-field test and analysis.Because PIV measures relatively accurate reliable, in considerable time from now on, PIV remains the tool master that flow field velocity is measured.
The difference of PIV system mainly is that at present, the querying method of PIV technology mainly contains two kinds: a kind of method is record double exposure image, i.e. an autocorrelation technique on same frame picture by the decision of the difference of querying method.Another kind method is to utilize the hardware performance of CCD camera uniqueness, will double expose image recording on two frame pictures, i.e. cross-correlation technique.The gray-scale statistics classification query method belongs to the autocorrelation technique category.For the auto-correlation querying method, owing on same picture, double expose, make that whom is difficult to distinguish on same the picture is the particle of exposure for the first time, who is the particle that exposes for the second time, just to exist the directions of 180 degree fuzzy for velocity reversal like this, be that the auto-correlation querying method exists the direction ambiguity problem, so the direction of correct decision velocity has become the key of auto-correlation PIV technology.At present, the greyness discriminance method is the solution party to one of effective means of ambiguity problem.The ultimate principle of greyness discriminance method is the capacity volume variance of twice laser pulse before and after utilizing, make when sheet laser illuminates flow field to be measured trace particle, the energy of particle scattering is also different, be the gradation of image difference that double exposure became of particle on photo, therefore can utilize the difference of gray scale to differentiate the right sequencing of particle, thereby the solution party is to ambiguity problem.
In the prior art, Wu Zhijun etc. are at " exploitation of particle picture velocity field instrument (PIV) imaging system " (" Jilin Industry University natural science journal ", 1999 the 3rd phases,) the PIV imaging system introduced in the literary composition, be to utilize the laser pulse of two different-energies of two laser instrument sequential firing to come simple realization gray-scale statistics classification query method.This method needs two laser instruments, the use cost height, topmost shortcoming is that two-laser emitted energy difference is fixed, and the right different gray differences of particle will influence the inquiry precision of particle picture speed, therefore the imaging system of two laser instrument sequential firing is arranged and can not be utilized to optimization the gray-scale statistics classification querying method, is difficult to satisfy the requirement of the high-acruracy survey in complicated flow field to be measured.
Summary of the invention
In order to overcome deficiency of the prior art and defective, the invention provides the particle picture velocity field instrument imaging system that is used for the gray-scale statistics classification inquiry, this system is that a kind of external modulation effect by acousto-optic modulator produces the laser pulse of different in width, frequency and intensity to realize the particle picture velocity field instrument imaging system of gray-scale statistics classification query method.
The present invention is achieved by the following technical solutions, the present invention includes semiconductor pumped continuous wave laser, acousto-optic modulator, baffle plate, lens combination, video camera, computing machine, digital synchronous pulse producer.Lens combination is made up of concavees lens, A convex lens and three lens of B convex lens.The digital synchronous pulse producer is made of single-chip microcomputer, A TTL signal output module, B TTL signal output module, aanalogvoltage output module and load module.Concavees lens in semiconductor pumped continuous wave laser, acousto-optic modulator, baffle plate and the lens combination, A convex lens and B convex lens are fixed on the planar linear guide rail successively, and the focus of the light path light hole of the light hole of semiconductor pumped continuous wave laser and acousto-optic modulator, the light hole of baffle plate, concavees lens, the focus of A convex lens and the focus of B convex lens all are positioned on the same horizontal linear.Flow field to be measured is arranged in the light path after the lens combination; Camera arrangements is on the flow field to be measured one side axis vertical with laser optical path; Computing machine is electrically connected by the usb data line with video camera; A TTL signal output module in the digital synchronous pulse producer by concentric cable be electrically connected with the pulse width modulation port of acousto-optic modulator, the voltage output module by concentric cable and acousto-optic modulator pulse strength regulate that port is electrically connected, B TTL signal output module by concentric cable be electrically connected with the control port of video camera, load module is electrically connected with the computing machine serial port by string line.
The steady and continuous laser beam irradiation that semiconductor pumped continuous wave laser sends is penetrated by light hole via acousto-optic modulator modulation back to the incidence hole of acousto-optic modulator, becomes the laser of multi beam different stage.Wherein, one-level light has big light intensity, and modulation is convenient, and as output light source directive lens combination, all the other what light go by the baffle plate retaining.The one-level light that acousto-optic modulator sends is behind the process concavees lens, and xsect is that circular laser beam is only vertically becoming the emission of fan type on the longitudinal section, formation sheet light; Behind the A convex lens, it is about 1mm that sheet light is compressed into thickness; Behind the B convex lens, vertically becoming the sheet light of fan type emission to become the sheet light of parallel emission on the longitudinal section, and the flow field to be measured of throwing light on.Video camera is taken the particle picture that flow field to be measured obtains and is sent in the computing machine via the usb data line, and its time shutter, computing machine was controlled video camera through same usb data line by computer settings.A road TTL signal and voltage signal that the digital synchronous pulse producer sends are transferred to acousto-optic modulator by concentric cable respectively, in order to pulse width, frequency and the intensity of while modulated laser; The B road TTL signal that sends is transferred to video camera by concentric cable, in order to the time of exposure of control video camera.The signal controlling whole system operation of the load module receiving computer of digital synchronous pulse producer.The work of acousto-optic modulator and video camera is by digital synchronous pulse producer synchronous coordination.
Beneficial effect of the present invention:
The present invention only needs a laser instrument, has simplified laser system; Pulse width, frequency and intensity are adjustable, and two pulsed laser energy differences are also adjustable simultaneously, have widened the scope of fluid-velocity survey, have reduced the difficulty of control; Do not need the internal modulation of laser instrument to produce the different laser pulse in front and back, guaranteed the stability of laser instrument to greatest extent, just guaranteed the quality of laser pulse yet; Thereby under the prerequisite that does not change laser instrument, can satisfy the demand of any complexity flow field survey precision to be measured.
Description of drawings
Fig. 1 is the structural representation of imaging system of the present invention.
Among the figure, 1 is that semiconductor pumped continuous wave laser, 2 is that acousto-optic modulator, 3 is that baffle plate, 4 is that concavees lens, 5 are that A convex lens, 6 are the B convex lens, and 7 is that lens combination, 8 is that flow field to be measured, 9 is that video camera, 10 is that computing machine, 11 is that B TTL signal output module, 12 is that single-chip microcomputer, 13 is that load module, 14 is that digital synchronous pulse producer, 15 is that voltage output module, 16 is an A TTL signal output module.
Embodiment
Below in conjunction with accompanying drawing concrete enforcement of the present invention is further described.
As shown in Figure 1, the present invention includes: semiconductor pumped continuous wave laser 1, acousto-optic modulator 2, baffle plate 3, lens combination 7, video camera 9, computing machine 10, digital synchronous pulse producer 14.Wherein, semiconductor pumped continuous wave laser 1 adopts the semiconductor pumped continuous wave laser of DPGL-2100 of Suwtech company; Acousto-optic modulator 2 is the linear impulsive combined type acousto-optic modulator of Shanghai Qing Jin Laser Devices development corporation, Ltd. customized production, can realize intensity, frequency and the width of modulated laser pulse simultaneously, produces the laser pulse of varying strength and pulse width; Baffle plate 3 has the flat board that diameter is 5mm～10mm light hole for the centre; Lens combination 7 is made up of concavees lens 4, A convex lens 5 and B convex lens 6; Concavees lens 4 are the cylindrical concave lens of focal distance f=14.5mm; A convex lens 5 are the cylindrical convex lens of f=1000mm; B convex lens 6 are the cylindrical convex lens of f=100mm; Video camera 9 is the DH-HV1300UM digital camera; Computing machine 10 is a common computer; Digital synchronous pulse producer 14 is made of A TTL signal output module 16, single-chip microcomputer 12, load module 13, B TTL signal output module 11, voltage output module 15.Concavees lens 4 in semiconductor pumped continuous wave laser 1, acousto-optic modulator 2, baffle plate 3 and the lens combination 7, A convex lens 5, B convex lens 6 are fixed on the planar linear guide rail from left to right successively, and the focus of the focus of the light path light hole of the light hole of semiconductor pumped continuous wave laser 1 and acousto-optic modulator 2, the light hole of baffle plate 3, concavees lens 4, the focus of A convex lens 5 and B convex lens 6 all is positioned on the same horizontal linear; Flow field 8 to be measured is arranged in the light path on lens combination 7 the right; Video camera 9 is arranged on the flow field to be measured 8 one sides axis vertical with laser optical path; Computing machine 10 is electrically connected by the usb data line with video camera 9; The output terminal of the A TTL signal output module 16 in the digital synchronous pulse producer 14 by concentric cable be electrically connected with the pulse width modulation port of acousto-optic modulator 2, the output terminal of voltage output module 15 by the pulse strength of concentric cable and acousto-optic modulator 2 regulate that port is electrically connected, the output terminal of B TTL signal output module 11 by concentric cable be electrically connected with the control port of video camera 9, the input port of load module 13 is electrically connected with computing machine 10 serial ports by string line.
The steady and continuous laser beam irradiation that semiconductor pumped continuous wave laser 1 sends is penetrated by light hole via acousto-optic modulator modulation 2 backs to the incidence hole of acousto-optic modulator 2, becomes the laser of multi beam different stage.Wherein, one-level light has big light intensity, and modulation is convenient, and as output light source directive lens combination 7, all the other what light go by baffle plate 3 retainings.The one-level light that acousto-optic modulator 2 sends is behind process concavees lens 4, and xsect is that circular laser beam is only vertically becoming the emission of fan type on the longitudinal section, formation sheet light; Behind A convex lens 5, it is about 1mm that sheet light is compressed into thickness; Behind B convex lens 6, vertically becoming the sheet light of fan type emission to become the sheet light of parallel emission on the longitudinal section, and the flow field 8 to be measured of throwing light on.The particle picture that video camera 9 shootings flow field 8 to be measured obtains is sent in the computing machine 10 via the usb data line, and its time shutter is set by computing machine 10, and computing machine 10 is controlled video camera 9 through same usb data line.A road TTL signal and voltage signal that digital synchronous pulse producer 14 sends are transferred to acousto-optic modulator 2 by concentric cable respectively, in order to pulse width, frequency and the intensity of while modulated laser; The B road TTL signal that sends is transferred to video camera 9 by concentric cable, in order to the time of exposure of control video camera 9.The signal controlling whole system operation of load module 13 receiving computers 10 of digital synchronous pulse producer 14.The work of acousto-optic modulator 2 and video camera 9 is by digital synchronous pulse producer 14 synchronous coordinations.
Claims (5)
1. one kind is used for the particle picture velocity field instrument imaging system that gray-scale statistics classification is inquired about, comprise semiconductor pumped continuous wave laser (1), acousto-optic modulator (2), baffle plate (3), lens combination (7), video camera (9), computing machine (10), digital synchronous pulse producer (14), it is characterized in that this system is the external modulation effect generation different in width by acousto-optic modulator, the laser pulse of frequency and intensity is to realize the particle picture velocity field instrument imaging system of gray-scale statistics classification query method, lens combination (7) is by concavees lens (4), A convex lens (5) and B convex lens (6) are formed, digital synchronous pulse producer (14) is by A TTL signal output module (16), single-chip microcomputer (12), load module (13), B TTL signal output module (11), voltage output module (15) constitutes, semiconductor pumped continuous wave laser (1), acousto-optic modulator (2), concavees lens (4) in baffle plate (3) and the lens combination (7), A convex lens (5), B convex lens (6) are fixed on the planar linear guide rail from left to right successively, flow field to be measured (8) is arranged in the light path on lens combination (7) the right, video camera (9) is arranged on flow field to be measured (8) the one sides axis vertical with laser optical path, computing machine (10) is electrically connected by the usb data line with video camera (9), and the output terminal of the ATTL signal output module (16) in the digital synchronous pulse producer (14) is electrically connected by the pulse width modulation port of concentric cable with acousto-optic modulator (2), the output terminal of voltage output module (15) is regulated port by concentric cable with the pulse strength of acousto-optic modulator (2) and is electrically connected, the output terminal of B TTL signal output module (11) is electrically connected by the control port of concentric cable with video camera (9), the input port of load module (13) is electrically connected with computing machine (10) serial port by string line.
2. the particle picture velocity field instrument imaging system that is used for the gray-scale statistics classification inquiry according to claim 1, it is characterized in that semiconductor pumped continuous wave laser (1) adopts the semiconductor pumped continuous wave laser of DPGL-2100 of Suwtech company, acousto-optic modulator (2) is the linear impulsive combined type acousto-optic modulator of Shanghai Qing Jin Laser Devices development corporation, Ltd. customized production.
3. the particle picture velocity field instrument imaging system that is used for the gray-scale statistics classification inquiry according to claim 1 is characterized in that baffle plate (3) has the flat board that diameter is 5mm～10mm light hole for the centre.
4. the particle picture velocity field instrument imaging system that is used for the gray-scale statistics classification inquiry according to claim 1 is characterized in that concavees lens (4) are the cylindrical concave lens of focal distance f=14.5mm; A convex lens (5) are the cylindrical convex lens of f=1000mm; B convex lens (6) are the cylindrical convex lens of f=100mm.
5. the particle picture velocity field instrument imaging system that is used for the gray-scale statistics classification inquiry according to claim 1 is characterized in that the light hole of semiconductor pumped continuous wave laser (1) and the light path light hole of acousto-optic modulator (2), the light hole of baffle plate (3), the focus of concavees lens (4), the focus of A convex lens (5) and the focus of B convex lens (6) all are positioned on the same horizontal linear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510030965 CN1763546A (en) | 2005-11-03 | 2005-11-03 | Imaging system of particle image velocimetry for gray scale statistics, discrimination and query |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510030965 CN1763546A (en) | 2005-11-03 | 2005-11-03 | Imaging system of particle image velocimetry for gray scale statistics, discrimination and query |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1763546A true CN1763546A (en) | 2006-04-26 |
Family
ID=36747788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510030965 Pending CN1763546A (en) | 2005-11-03 | 2005-11-03 | Imaging system of particle image velocimetry for gray scale statistics, discrimination and query |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1763546A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101231161B (en) * | 2007-01-23 | 2010-07-14 | 同济大学 | Method for measuring particle diameter |
| CN101231299B (en) * | 2007-01-23 | 2010-12-01 | 同济大学 | Method for measuring particle velocity |
| CN102393473A (en) * | 2011-08-02 | 2012-03-28 | 南京理工大学 | System for testing particle moving speed based on single image |
| CN102393193A (en) * | 2011-10-12 | 2012-03-28 | 清华大学 | High frequency image acquisition system for measuring flow rate |
| CN101295024B (en) * | 2007-04-29 | 2012-05-23 | 同济大学 | Method for measuring particle size |
| CN104504359A (en) * | 2015-01-14 | 2015-04-08 | 王启云 | Laser head mechanism of scanning spear |
-
2005
- 2005-11-03 CN CN 200510030965 patent/CN1763546A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101231161B (en) * | 2007-01-23 | 2010-07-14 | 同济大学 | Method for measuring particle diameter |
| CN101231299B (en) * | 2007-01-23 | 2010-12-01 | 同济大学 | Method for measuring particle velocity |
| CN101295024B (en) * | 2007-04-29 | 2012-05-23 | 同济大学 | Method for measuring particle size |
| CN102393473A (en) * | 2011-08-02 | 2012-03-28 | 南京理工大学 | System for testing particle moving speed based on single image |
| CN102393193A (en) * | 2011-10-12 | 2012-03-28 | 清华大学 | High frequency image acquisition system for measuring flow rate |
| CN104504359A (en) * | 2015-01-14 | 2015-04-08 | 王启云 | Laser head mechanism of scanning spear |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1763546A (en) | Imaging system of particle image velocimetry for gray scale statistics, discrimination and query | |
| CN104101880B (en) | Optical distance measuring apparatus | |
| CN1041128C (en) | Particle analysing equipment | |
| CN105675633B (en) | A kind of caliberating device of X-ray framing camera | |
| CN2606895Y (en) | Digital particle image velocity measurement system | |
| US20060175561A1 (en) | Particle shadow velocimetry | |
| CN1086313A (en) | Particle analysing device | |
| CN102169050A (en) | Comprehensive measurement method for reflectivity | |
| KR930013685A (en) | High resolution compact optical sensor for three-dimensional shape scanning | |
| CN1668906A (en) | Optical fiber polarization mode dispersion measurement method and measurement device | |
| CN104459510A (en) | LED array junction temperature quick on-line detecting device | |
| CN1460073A (en) | Card true/false decision apparatus | |
| CN2612943Y (en) | Micro particle graininess laser imaging measuring apparatus | |
| CN104698467A (en) | Multi-target pulse laser ranging device and method for different aiming lines | |
| GB2119924A (en) | Arrangement for measuring fluorescence polarization | |
| CN1369697A (en) | Lens detector for measuring performance of lens or contact lens | |
| Marko et al. | Video recording and quantitative analysis of seed particle track images in unsteady flows | |
| Li et al. | Multi-point laser Doppler velocimeter | |
| CN104952141A (en) | Bank-note identifying and receiving apparatus with galvanometer scanning | |
| US20080030721A1 (en) | Optical apparatus and methods for chemical analysis | |
| CN207881652U (en) | A kind of object edge feature detection device | |
| CN202869949U (en) | Optical system for enhancing optical excitation wave signal based on energy recovery principle | |
| CN105043305A (en) | Quantum correlated autocollimator and angle measurement method thereof | |
| DE3933062C2 (en) | ||
| CN102854134A (en) | Energy recovery principle based optical system for enhancing optical excitation wave signal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |