CN207423988U - A kind of double camera PIV flow field survey devices based on binocular lens tube - Google Patents
A kind of double camera PIV flow field survey devices based on binocular lens tube Download PDFInfo
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- CN207423988U CN207423988U CN201721538114.7U CN201721538114U CN207423988U CN 207423988 U CN207423988 U CN 207423988U CN 201721538114 U CN201721538114 U CN 201721538114U CN 207423988 U CN207423988 U CN 207423988U
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Abstract
The utility model provides a kind of double camera PIV flow field survey devices based on binocular lens tube, and device is mainly made 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 take 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 different number grade flow field velocity.The utility model has the advantages of mechanism is compact, and measurement range is big, high certainty of measurement, stable and reliable in work, favorable repeatability.
Description
Technical field
The utility model is related to a kind of PIV image collecting devices, are suitable for flow field different in flow rate more particularly to one kind and survey
The double camera PIV flow field survey devices based on binocular lens tube of amount.
Background technology
So-called Flow visualisation is to visualize 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 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 entire 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 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 acquisition.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）Grade even nanosecond（ns）
Grade just can guarantee the correlation between two images, 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 be subject to itself sensitive time and storage, can not continuous acquisition two to open interval time extremely short
Clear image.Therefore, current PIV flow field surveys system using expensive specialty PIV cameras, causes PIV flow fields to be surveyed
It is expensive to measure device, is unfavorable for the application and popularization of PIV flow field survey devices.
Utility model content
For the technical deficiency more than overcoming, the purpose of this utility model is that the cost of PIV flow field survey devices is reduced,
The measurement accuracy of device is improved, so that the PIV flow field survey devices is used widely, and is provided a kind of based on binocular lens tube
Double camera PIV flow field surveys device and measuring method.
The utility model provides a kind of double camera PIV flow field survey devices based on binocular lens tube, including：
Point light source is converted into sheet laser, and illuminates the flow field regions of measurement by optical module；
Image Acquisition 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；
Control system component, including computer, isochronous controller and trigger, the trigger and trigger-type industry
CCD camera connects, and the computer is connected by isochronous controller with the optical module, and the isochronous controller passes through inside
When base generate the cycle pulse triggering signal and optical module is controlled to act.
The optical module includes dual pulse welding and optics microscope group, and the optics microscope group can be by dual pulse welding
The light beam of generation is transformed into sheet laser.
The binocular lens tube includes an object lens port and two eyepiece ports, and two eyepiece ports are triggered respectively with two
Formula industrial CCD camera is connected.
Spectro-prism and two reflex prisms there are one being set in the binocular lens tube, the incidence of the camera lens acquisition
Light is into being divided into two light beams after 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.
The binocular lens tube is at least one of binocular device, binocular head, light-dividing device light equipartition device.
The beneficial effects of the utility model：Two trigger-type industrial CCD cameras are combined using binocular lens tube parallel way, are led to
Isochronous controller and trigger control are crossed, it is noiseless each other.Using isochronous controller, when control industrial CCD camera senses
Between in dual pulse welding laser pulse range, interval time is controllable, image clearly.Be mainly used in different measurement ranges,
The flow field survey field of grade different in flow rate.The utility model is compact with mechanism, and measurement range is big, high certainty of measurement, work
It is reliable and stable, the advantages of favorable repeatability.
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 system connection diagrams in order to control.
Fig. 4 signal timing diagrams in order to control.
Fig. 5 is cross-correlation picture shooting sequence 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.
Specific embodiment
The utility model embodiment is described further below in conjunction with the accompanying drawings：
As shown in the figure, the utility model provides a kind of double camera PIV flow field survey devices based on binocular lens tube, dipulse
Laser 17 is connected with isochronous controller 18, and dual pulse welding is generated by optics microscope group 16 can cover entire stream to be measured
The sheet laser 15 of field areas sets gradually industrial lens 14 and spectro-prism 12, piece on the reflection path of sheet laser 15
The incident beam of light source 15 is divided into the identical light beam of two beams after industrial lens and spectro-prism, and in two light
Reflective prism I11 and reflective prism II13 is set respectively on the path of beam, by the light beam of reflective prism I11 by work
Industry CCD camera I8 is captured, and the light beam for passing through reflective prism II13 is then captured by industrial CCD camera II9, and the two parallel connection is set
Put, it is non-interference, can obtain two images, and power supply of the power supply 7 then as whole system exists, industrial CCD camera I8 and
Industrial CCD camera 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 calculating
In machine 2, and shown on display 1, while isochronous controller 18 is then computer controlled, and isochronous controller 18 passes through triggering
The work of device II5 and trigger I6 controls industrial CCD camera I8 and industrial CCD camera II9.
Point light source is converted into sheet laser, and illuminates the flow field regions of measurement by optical module；Optical module includes dipulse
Laser 17 and optics microscope group 16, the light beam that dual pulse welding generates can become sheet laser 15 by optics microscope group, illuminate
Flow field regions to be measured.
Image Acquisition 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.The binocular lens tube is equal for light such as binocular device, binocular head, light-dividing devices
At least one of separating device.
Spectro-prism and two reflex prisms there are one being set in the binocular lens tube, the incidence of the camera lens acquisition
Light is into being divided into two light beams after 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 forms parallel-connection structure 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 to store the image data that image pick-up card is provided.
Control system component, including computer, isochronous controller and trigger, the trigger and trigger-type industry
CCD camera connects, and the computer is connected by isochronous controller with the optical module, and the isochronous controller passes through inside
When base generate the cycle pulse triggering signal and optical module is controlled to act.
The optical module includes dual pulse welding and optics microscope group, and the optics microscope group can be by dual pulse welding
The light beam of generation is transformed into sheet laser.
The binocular lens tube includes an object lens port and two eyepiece ports, and two eyepiece ports are triggered respectively with two
Formula industrial CCD camera is connected.
Spectro-prism and two reflex prisms there are one being set in the binocular lens tube, the incidence of the camera lens acquisition
Light is into being divided into two light beams after 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 measuring method based on the above-mentioned double camera PIV flow field survey devices based on binocular lens tube, including following
Step：
First, by two pulse signals of the isochronous controller output with time interval, and double-pulse laser is controlled respectively
The time interval for the light beam that device generates, the light velocity that dual pulse welding generates be converted to through optics microscope group illuminate it is entire to be measured
The sheet laser of flow field regions；
2nd, isochronous controller output has the trigger signal at same time interval with pulse signal, and controls trigger-type work
Industry CCD camera captures the image in the corresponding triggered time of flow field regions, while some the row image datas captured are passed through figure
As capture card is transferred in computer in real time, two images match as one group of cross correlation image.
Trigger signal is provided by isochronous controller and trigger, so as to keep fully synchronized 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 after reflex prism by two same trigger-type CCD cameras respectively.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, obtain meeting the clear image of PIV image procossings cross-correlation requirement.It is logical
The acquisition of two images of any time interval can theoretically be realized by crossing the triggering control time interval of two cameras of control, full
The mutual requirement of sufficient different number grade flow field velocity PIV flow field survey system diagram pictures.
Embodiment is not construed as the limitation to the utility model, any spiritual improvements introduced based on the utility model,
It all should be within the scope of protection of the utility model.
Claims (6)
1. a kind of double camera PIV flow field survey devices based on binocular lens tube, it is characterised in that：It includes：
Point light source is converted into sheet laser, and illuminates the flow field regions of measurement by optical module；
Image Acquisition 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, and two trigger-type industrial CCD camera acquisitions are same
The image in region；
Control system component, including computer, isochronous controller and trigger, the trigger and trigger-type industrial CCD
Camera connects, and the computer is connected by isochronous controller with the optical module, when the isochronous controller passes through inside
Base generates the pulse triggering signal in cycle and optical module is controlled to act.
2. the double camera PIV flow field survey devices according to claim 1 based on binocular lens tube, which is characterized in that described
Optical module includes dual pulse welding and optics microscope group, and the light beam that the optics microscope group can generate dual pulse welding turns
Become sheet laser.
3. the double camera PIV flow field survey devices according to claim 1 based on binocular lens tube, which is characterized in that described
Binocular lens tube include 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, which is characterized in that institute
It states and is set in binocular lens tube there are one spectro-prism and two reflex prisms, the incident light of the camera lens acquisition is into 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, which is characterized 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, which is characterized in that described
Binocular lens tube be binocular device, binocular head, at least one of light-dividing device light equipartition device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721538114.7U CN207423988U (en) | 2017-11-17 | 2017-11-17 | A kind of double camera PIV flow field survey devices based on binocular lens tube |
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| CN201721538114.7U CN207423988U (en) | 2017-11-17 | 2017-11-17 | A kind of double camera PIV flow field survey devices based on binocular lens tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741506A (en) * | 2017-11-17 | 2018-02-27 | 嘉兴学院 | A kind of double camera PIV flow field surveys device and its control method based on binocular lens tube |
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2017
- 2017-11-17 CN CN201721538114.7U patent/CN207423988U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741506A (en) * | 2017-11-17 | 2018-02-27 | 嘉兴学院 | A kind of double camera PIV flow field surveys device and its control method based on binocular lens tube |
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