CN107741506A - A kind of double camera PIV flow field surveys device and its control method based on binocular lens tube - Google Patents
A kind of double camera PIV flow field surveys device and its control method based on binocular lens tube Download PDFInfo
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- CN107741506A CN107741506A CN201711142936.8A CN201711142936A CN107741506A CN 107741506 A CN107741506 A CN 107741506A CN 201711142936 A CN201711142936 A CN 201711142936A CN 107741506 A CN107741506 A CN 107741506A
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- flow field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/001—Full-field flow measurement, e.g. determining flow velocity and direction in a whole region at the same time, flow visualisation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/04—Special adaptations of driving means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/18—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance
- G01P5/22—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means
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Abstract
The present invention provides a kind of double camera PIV flow field surveys device and its control method based on binocular lens tube, and device is mainly made up of industrial lens, binocular lens tube and two trigger-type industrial CCD cameras, triggers.On this basis PIV flow field survey devices can be formed plus dual pulse welding, isochronous controller and computer.In measurement process, dual pulse welding direct irradiation is tested flow field, ensures that two cameras photograph the same area using binocular lens tube device；The shooting time of two cameras is controlled by isochronous controller and trigger, obtains the shooting time interval of two cross correlation images；Each pulsed light of dual pulse welding was fallen in the sensitive time of each image, to obtain clearly flow field figure picture.With reference to the cross correlation process of image, the speed vector figure of two frame cross-correlation flow field figure pictures can be obtained, realizes the accurate measurement of varying number level flow field velocity.The present invention has that mechanism is compact, and measurement range is big, and measurement accuracy is high, stable and reliable in work, the advantages of favorable repeatability.
Description
Technical field
The present invention relates to a kind of PIV image collecting devices, more particularly to a kind of suitable for flow field survey different in flow rate
Double camera PIV flow field surveys device and its control method based on binocular lens tube.
Background technology
So-called Flow visualisation is to be visualized some characteristics in flow field, so as to obtain the flow field intuitively information.Grain
Subgraph velocity measuring technique（PIV）It is a kind of brand-new flow velocity e measurement technology to grow up in Flow visualisation technical foundation.With
The development of Computer Image Processing and optical technology etc., passes through the auto-correlation or cross correlation process to gathering image, PIV technologies
The relevant information of whole measurement plane can be recorded in synchronization, it is hereby achieved that the instantaneous planar velocity field of flowing.
As terminology used here, " correlation " includes auto-correlation and cross-correlation etc..Digital picture correlation is for not
Two frame of digital images in the same time, seek the best match of image pattern sub-district and target sub-district, and its key issue is related
With computing.And the basis of digital picture relevant treatment is the shorter image of two continuous frames time interval.Two images must have
Certain correlation, the data result that could be gathered according to required for obtaining the image procossing of collection.Therefore, surveyed in PIV flow fields
During amount, most important is to obtain clearly flow field figure picture.
In order to detect swiftly flowing liquid or gas flowfield, measuring system needs to gather continuous two or multiple are clear
Image.Particularly measure high-velocity fluid, the time interval between two images needs to reach microsecond（μs）Level even nanosecond（ns）
Level, the correlation between two images is just can guarantee that, realize accurate measurement.
At present, ensure that the shooting interval of camera is smaller to realize, usually using the PIV cameras of specialty.It is and common outer
Trigger-type industrial CCD camera, is limited by itself sensitive time and storage, can not continuous acquisition two to open interval time extremely short
Picture rich in detail.Therefore, current PIV flow field surveys system, using expensive professional PIV cameras, PIV flow fields are caused to be surveyed
It is expensive to measure device, is unfavorable for the application and popularization of PIV flow field survey devices.
The content of the invention
In order to overcome the technical deficiency of the above, it is an object of the invention to reduce the cost of PIV flow field survey devices, improve
The measurement accuracy of device, PIV flow field survey devices is used widely, and a kind of two-phase based on binocular lens tube is provided
Machine PIV flow field surveys device and its control method.
The present invention provides a kind of double camera PIV flow field survey devices based on binocular lens tube, and it includes：
Optical module, spot light is converted into sheet laser, and illuminates the flow field regions of measurement；
IMAQ and storage assembly, including image acquisition units, binocular lens tube and camera lens, the sheet laser of the optical module
At two eyepiece ports through lens reflex to binocular lens tube, trigger-type industrial CCD camera is set respectively at the eyepiece port,
The trigger-type industrial CCD camera is connected with described image collecting unit, the collection of two trigger-type industrial CCD cameras to be same
The image in region；
Control system component, it includes computer, isochronous controller and trigger, the trigger and trigger-type industrial CCD
Camera is connected, and the computer is connected by isochronous controller with the optical module, when the isochronous controller passes through inside
Base produces the pulse triggering signal in cycle and controls optical module to act.
The optical module includes dual pulse welding and optics microscope group, and the optics microscope group can be by dual pulse welding
Caused light beam is transformed into sheet laser.
The binocular lens tube includes an object lens port and two eyepiece ports, and two eyepiece ports are triggered with two respectively
Formula industrial CCD camera is connected.
A spectro-prism and two reflex prisms, the incidence of the camera lens collection are provided with the binocular lens tube
Light is divided into two light beams after entering the spectro-prism, and respectively by reflex prism to two eyepiece ports.
The trigger-type industrial CCD camera and binocular lens tube form cascaded structure, and two trigger-type industrial CCD cameras is simultaneously
It is coupled structure.
Described binocular lens tube is at least one of binocular device, binocular head, light-dividing device light equipartition device.
A kind of control method based on the above-mentioned double camera PIV flow field survey devices based on binocular lens tube, it includes following
Step：
First, by two pulse signals of the isochronous controller output with time interval, and dual pulse welding production is controlled respectively
The time interval of raw light beam, light beam caused by dual pulse welding is converted to through optics microscope group illuminates whole flow field to be measured
The sheet laser in region；
2nd, isochronous controller output has the trigger signal at same time interval with pulse signal, and controls trigger-type industrial CCD
The image in the corresponding triggered time of cameras capture flow field regions, and the image of seizure is sent to computer, and by two industry
The image that CCD camera is caught, which matches, is used as one group of cross correlation image.
Beneficial effects of the present invention：Two trigger-type industrial CCD cameras are combined using binocular lens tube parallel way, by same
Controller and trigger control are walked, it is noiseless each other.Using isochronous controller, the control industrial CCD camera sensitive time exists
In dual pulse welding laser pulse range, interval time is controllable, image clearly.It is mainly used in different measurement ranges, difference
The flow field survey field of flow velocity grade.The present invention is compact with mechanism, and measurement range is big, and measurement accuracy is high, stable and reliable in work,
The advantages of favorable repeatability.
Brief description of the drawings
Fig. 1 is the double camera PIV image collecting device schematic diagrames based on binocular lens tube.
Fig. 2 is binocular lens tube and double camera scheme of installation.
Fig. 3 is control system connection diagram.
Fig. 4 is control signal timing diagram.
Fig. 5 is cross-correlation picture shooting timing diagram.
In figure：1. display；2. host computer；3. image pick-up card I；4. image pick-up card II；5. trigger
II；6. trigger I；7. power supply；8. industrial CCD camera I；9. industrial CCD camera II；10. binocular lens tube； 11.
Reflective prism I；12. spectro-prism；13. reflective prism II；14. industrial lens；15. sheet laser；16. light
Learn microscope group；17. dual pulse welding；18. isochronous controller.
Embodiment
Embodiments of the present invention is further illustrated below in conjunction with the accompanying drawings：
As illustrated, the present invention provides a kind of double camera PIV flow field survey devices based on binocular lens tube, dual pulse welding 17
It is connected with isochronous controller 18, dual pulse welding is produced by optics microscope group 16 can cover whole flow field regions to be measured
Sheet laser 15, industrial lens 14 and spectro-prism 12 are set gradually on the reflection path of sheet laser 15, sheet laser 15
Incident beam is divided into two beam identical light beams after industrial lens and spectro-prism, and in the path of two light beams
It is upper that reflective prism I11 and reflective prism II13 is set respectively, by reflective prism I11 light beam by industrial CCD phase
Machine I8 is caught, and the light beam for passing through reflective prism II13 is then caught by industrial CCD camera II9, and both are arranged in parallel, and do not do mutually
Relate to, two images can be obtained, and power supply of the power supply 7 then as whole system is present, industrial CCD camera I8 and industrial CCD phase
Machine II9 is then connected with image pick-up card I3 and image pick-up card II4 respectively, and image pick-up card is then placed in computer 2, and
Shown on display 1, while isochronous controller 18 is then computer controlled, and isochronous controller 18 by trigger II5 and touches
Send out device I6 controls industrial CCD camera I8 and industrial CCD camera II9 work.
Optical module, spot light is converted into sheet laser, and illuminates the flow field regions of measurement；Optical module includes dipulse
Laser 17 and optics microscope group 16, light beam caused by dual pulse welding can become sheet laser 15 by optics microscope group, illuminate
Flow field regions to be measured.
IMAQ and storage assembly, including image acquisition units, binocular lens tube and camera lens, the piece of the optical module
At two eyepiece ports of the light source through lens reflex to binocular lens tube, trigger-type industrial CCD is set respectively at the eyepiece port
Camera, the trigger-type industrial CCD camera are connected with described image collecting unit, what two trigger-type industrial CCD cameras gathered
For the image of the same area；The binocular lens tube includes an object lens port and two eyepiece ports, two eyepiece port difference
It is connected with two trigger-type industrial CCD cameras.Described binocular lens tube is that the light such as binocular device, binocular head, light-dividing device are equal
At least one of separating device.
A spectro-prism and two reflex prisms, the incidence of the camera lens collection are provided with the binocular lens tube
Light is divided into two light beams after entering the spectro-prism, and respectively by reflex prism to two eyepiece ports.Two triggerings
Formula industrial CCD camera just can gather the image of the same area, and can guarantee that the region that two cameras are shot is the same area.
Trigger-type industrial CCD camera as two, parallel-connection structure is formed with reference to binocular lens tube.The figure of two camera shootings
Picture does not interfere with simultaneously, can shoot the photo in time arbitrary interval.
Computer 2 is then used for the view data that storage image capture card is provided.
Control system component, it includes computer, isochronous controller and trigger, the trigger and trigger-type industry
CCD camera is connected, and the computer is connected by isochronous controller with the optical module, and the isochronous controller passes through inside
When base produce the cycle pulse triggering signal and control optical module to act.
The optical module includes dual pulse welding and optics microscope group, and the optics microscope group can be by dual pulse welding
Caused light beam is transformed into sheet laser.
The binocular lens tube includes an object lens port and two eyepiece ports, and two eyepiece ports are triggered with two respectively
Formula industrial CCD camera is connected.
A spectro-prism and two reflex prisms, the incidence of the camera lens collection are provided with the binocular lens tube
Light is divided into two light beams after entering the spectro-prism, and respectively by reflex prism to two eyepiece ports.
The trigger-type industrial CCD camera and binocular lens tube form cascaded structure, and two trigger-type industrial CCD cameras is simultaneously
It is coupled structure.
A kind of control method based on the above-mentioned double camera PIV flow field survey devices based on binocular lens tube, it includes following
Step：
First, by two pulse signals of the isochronous controller output with time interval, and dual pulse welding production is controlled respectively
The time interval of raw light beam, the light velocity caused by dual pulse welding is converted to through optics microscope group illuminates whole flow field to be measured
The sheet laser in region；
2nd, isochronous controller output has the trigger signal at same time interval with pulse signal, and controls trigger-type industrial CCD
The image in the corresponding triggered time of cameras capture flow field regions, while some the row view data captured are passed through into IMAQ
Card is transferred in computer in real time, and two images, which match, is used as one group of cross correlation image.
Trigger signal is provided by isochronous controller and trigger, so as to keep the Complete Synchronization with dual pulse welding.It is double
The signal of two pulses of pulse laser, allows for cooperating with camera used, realizes sensitive time and the arteries and veins of two cameras
The time of punching is corresponding, ensures image clearly.
A kind of double camera PIV image collecting devices based on binocular lens tube disclosure satisfy that above-mentioned or other demands.
Light source irradiation needs the particle shot, and the subreflexive light of grain enters binocular device, divided by spectro-prism
For two beams, two-beam is gathered by two same trigger-type CCD cameras respectively after reflex prism.Utilize binocular lens tube
Ensure that two industrial CCD cameras shoot the same area, the triggered time of two cameras controlled using isochronous controller and trigger,
When accurately controlling the shooting time interval of two images, and can ensure that each camera gathers image, dual pulse welding
Pulsed light fall in the time for exposure of correspondence image, be met PIV image procossings cross-correlation requirement picture rich in detail.It is logical
The collection of two images of any time interval can be realized in theory by crossing the triggering control time interval of two cameras of control, full
The mutual requirement of sufficient varying number level flow field velocity PIV flow field survey system diagram pictures.
Embodiment is not construed as limitation of the present invention, any spiritual improvements introduced based on the present invention, all Ying Ben
Within the protection domain of invention.
Claims (7)
- A kind of 1. double camera PIV flow field survey devices based on binocular lens tube, it is characterised in that：It includes：Optical module, spot light is converted into sheet laser, and illuminates the flow field regions of measurement；IMAQ and storage assembly, including image acquisition units, binocular lens tube and camera lens, the sheet laser of the optical module At two eyepiece ports through lens reflex to binocular lens tube, trigger-type industrial CCD camera is set respectively at the eyepiece port, The trigger-type industrial CCD camera is connected with described image collecting unit, the collection of two trigger-type industrial CCD cameras to be same The image in region；Control system component, it includes computer, isochronous controller and trigger, the trigger and trigger-type industrial CCD Camera is connected, and the computer is connected by isochronous controller with the optical module, when the isochronous controller passes through inside Base produces the pulse triggering signal in cycle and controls optical module to act.
- 2. the double camera PIV flow field survey devices according to claim 1 based on binocular lens tube, it is characterised in that described Optical module includes dual pulse welding and optics microscope group, and the optics microscope group can turn light beam caused by dual pulse welding Become sheet laser.
- 3. the double camera PIV flow field survey devices according to claim 1 based on binocular lens tube, it is characterised in that described Binocular lens tube includes an object lens port and two eyepiece ports, two eyepiece ports respectively with two trigger-type industrial CCD phases Machine is connected.
- 4. the double camera PIV flow field survey devices based on binocular lens tube according to claim 1 or 3, it is characterised in that institute State and a spectro-prism and two reflex prisms are provided with binocular lens tube, the incident light of the camera lens collection enters described point It is divided into two light beams after RHIZOMA SPARGANII mirror, and respectively by reflex prism to two eyepiece ports.
- 5. the double camera PIV flow field survey devices according to claim 4 based on binocular lens tube, it is characterised in that described Trigger-type industrial CCD camera and binocular lens tube form cascaded structure, and two trigger-type industrial CCD cameras are parallel-connection structure.
- 6. the double camera PIV flow field survey devices according to claim 1 based on binocular lens tube, it is characterised in that described Binocular lens tube be binocular device, binocular head, at least one of light-dividing device light equipartition device.
- It is 7. a kind of based on the double camera PIV flow field survey devices based on binocular lens tube the claims 1,2,3,4,5 or 6 Suo Shu Control method, it is characterised in that：It comprises the following steps：First, by two pulse signals of the isochronous controller output with time interval, and dual pulse welding production is controlled respectively The time interval of raw light beam, light beam caused by dual pulse welding is converted to through optics microscope group illuminates whole flow field to be measured The sheet laser in region；2nd, isochronous controller output has the trigger signal at same time interval with pulse signal, and controls trigger-type industrial CCD The image in the corresponding triggered time of cameras capture flow field regions, and the image of seizure is sent to computer, and by two industry The image that CCD camera is caught, which matches, is used as one group of cross correlation image.
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| CN201711142936.8A CN107741506A (en) | 2017-11-17 | 2017-11-17 | A kind of double camera PIV flow field surveys device and its control method based on binocular lens tube |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459581A (en) * | 2018-11-06 | 2019-03-12 | 浙江大学 | PIV device based on LED light source and the shooting of camera spectroscope |
| CN109946478A (en) * | 2019-03-24 | 2019-06-28 | 北京工业大学 | A kind of detection system for the Aerostatic Spindle internal gas flow velocity |
| CN110177235A (en) * | 2018-11-06 | 2019-08-27 | 广东小天才科技有限公司 | A kind of video synchronization method and wearable device based on wearable device |
| CN110687315A (en) * | 2019-10-31 | 2020-01-14 | 华中科技大学 | Flow field velocity measuring system capable of adaptively adjusting time interval |
| CN113936063A (en) * | 2020-12-30 | 2022-01-14 | 诡谷子人工智能科技(深圳)有限公司 | Double-light-path imaging device, image depth detection method and storage medium |
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| CN207423988U (en) * | 2017-11-17 | 2018-05-29 | 嘉兴学院 | A kind of double camera PIV flow field survey devices based on binocular lens tube |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459581A (en) * | 2018-11-06 | 2019-03-12 | 浙江大学 | PIV device based on LED light source and the shooting of camera spectroscope |
| CN110177235A (en) * | 2018-11-06 | 2019-08-27 | 广东小天才科技有限公司 | A kind of video synchronization method and wearable device based on wearable device |
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| CN113936063A (en) * | 2020-12-30 | 2022-01-14 | 诡谷子人工智能科技(深圳)有限公司 | Double-light-path imaging device, image depth detection method and storage medium |
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