CN211352275U - Visual device for detecting inside of high-temperature narrow cavity - Google Patents
Visual device for detecting inside of high-temperature narrow cavity Download PDFInfo
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- CN211352275U CN211352275U CN201921855134.6U CN201921855134U CN211352275U CN 211352275 U CN211352275 U CN 211352275U CN 201921855134 U CN201921855134 U CN 201921855134U CN 211352275 U CN211352275 U CN 211352275U
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Abstract
A vision apparatus for high temperature stenotic lumen internal inspection, comprising: the pixel polarization camera (1) is arranged outside the high-temperature narrow cavity; the high-temperature optical lens barrel (2) is arranged in the high-temperature narrow cavity, a semi-transparent reflector (3), a reflector (4), a first polarizer (5) and a second polarizer (6) are arranged in the high-temperature optical lens barrel (2), and the polarization angle of the first polarizer (5) is orthogonal to that of the second polarizer (6); the light reflected by the object is polarized by the first polarizer (5), then reflected by the semi-transparent reflector (3) and enters the pixel polarization camera (1) for imaging; the light reflected by the object is polarized by the second polarizer (6), reflected by the reflector (4) and enters the pixel polarization camera (1) for imaging; and a stroboscopic illumination system for setting an exposure time of the imaging. The device meets the detection of the interior of a high-temperature narrow cavity, and realizes the measurement of the relevant appearance, displacement and deformation of the three-dimensional digital image of the interior of the high temperature by small-volume equipment.
Description
Technical Field
The utility model relates to a computer vision and monitoring field especially relate to a vision device that is used for inside detection of narrow cavity of high temperature.
Background
The displacement and strain on-line detection of mechanical components in high-temperature environment is wide in demand but high in difficulty, especially for closed narrow environments such as aviation turbine engines, the space reserved for detection equipment is very narrow, meanwhile, the environment temperature of the mechanical components can be 500-1200 ℃, and the working condition is very severe. The measurement of the strain field of the blade under the high-speed rotation working condition is always a key problem expected to be solved by the industry.
In conventional stereo digital image correlation or other computer binocular stereo vision applications, two similar cameras are needed to observe a measured object at a certain stereo visual angle. For this purpose, it is necessary to fix the cameras using a hardware synchronizer and a dedicated support bracket that coordinate the simultaneous exposure of the two cameras. The volume is large, and the detection in the ultrahigh-temperature narrow cavity cannot be adapted. The conventional single-camera binocular detection method usually uses a binocular observation device for splitting pictures to image part of a target surface of a camera, the visual angle of the conventional single-camera binocular detection method is limited, and the restriction of measuring environmental parameters is difficult to meet.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
To solve the technical problem at present, the utility model provides a vision device for inside detection of narrow cavity of high temperature for at least part of solve one of above-mentioned technical problem.
(II) technical scheme
An aspect of the utility model is to provide a vision device for the inside object detection of the narrow cavity of high temperature, include: the pixel polarization camera 1 is arranged outside the high-temperature narrow cavity; a high temperature optical lens barrel 2, which is arranged in the high temperature narrow cavity, wherein a semi-transparent reflector 3, a reflector 4, a first polarizer 5 and a second polarizer 6 are arranged in the high temperature optical lens barrel 2, wherein the polarization angle of the first polarizer 5 is orthogonal to that of the second polarizer 6; wherein, the light reflected by the object is polarized by the first polarizer 5, then reflected by the semi-transparent reflector 3, and enters the pixel polarization camera 1 for imaging; the light reflected by the object is polarized by the second polarizer 6, reflected by the reflector 4 and enters the pixel polarization camera 1 for imaging; and the stroboscopic illumination system is used for setting the exposure time of the pixel polarization camera 1 in the imaging process.
Optionally, the pixel polarization camera 1 is a single-target pixel polarization camera or a dual high-speed camera based on polarization splitting.
Optionally, the single-target-surface pixel polarization camera can shoot 30-200 frames per second, and the dual high-speed camera based on polarization beam splitting can shoot 2-50 ten thousand frames per second.
Alternatively, a dual high-speed camera based on polarization splitting includes a splitting device, a pair of polarizing plates, and two high-speed cameras.
Optionally, the stroboscopic illumination system comprises: the device comprises a stroboscopic light source 10, a control module, a stroboscopic light source driving circuit and a stroboscopic detection module; the control module is used for controlling the stroboscopic light source driving circuit to drive the stroboscopic light source to emit light flickering according to a preset frequency according to the instruction so as to control the exposure time of the pixel polarization camera 1 in the imaging process; the stroboscopic detection module is used for measuring the light flickering according to a preset frequency.
Optionally, the control module includes an embedded microprocessor and a programmable logic array chip.
Optionally, the strobe light source drive circuit comprises an adjustable power supply, a high speed field effect transistor and a high speed field effect transistor driver.
Optionally, the strobe detection module includes a transimpedance operational amplifier and a silicon photodiode.
Optionally, the stroboscopic illumination system further comprises: and an arc-shaped reflector 11 for guiding the light emitted from the stroboscopic light source 10 into the high-temperature optical barrel 2.
Optionally, the outer diameter of the high-temperature optical barrel 2 is 1 cm to 2 cm.
(III) advantageous effects
The utility model provides a pair of a vision device for inside detection of narrow cavity of high temperature through set up bireflector and bipolarization mirror in high temperature optics section of thick bamboo mirror, constitutes small and bear the light path that high temperature ability is strong, satisfies the inside detection of the narrow cavity of high temperature, and the light path that can export different visual angles provides the outside camera of high temperature cavity. Meanwhile, the single camera is a pixel polarization camera, can obtain binocular pictures, has a wide visual angle of the whole target surface, realizes measurement of the related morphology, displacement and deformation of the three-dimensional digital image in the high-temperature interior by small-volume equipment, can select the single-target-surface pixel polarization camera or a dual high-speed camera based on polarization beam splitting, and meets the requirements of low-speed measurement and high-speed measurement.
Drawings
Fig. 1 schematically illustrates a block diagram of a vision apparatus provided by an embodiment of the present invention;
fig. 2 schematically illustrates a structure diagram of a photosensitive chip of a pixel polarization camera according to an embodiment of the present invention;
fig. 3 schematically illustrates a block diagram of a stroboscopic illumination system provided in an embodiment of the present invention;
fig. 4 schematically shows a block diagram of a vision apparatus provided by an embodiment of the present invention;
fig. 5A schematically shows an out-of-plane displacement graph of the surface of a PVC pipe in an experimental result of measurement of the PVC pipe based on a vision apparatus provided by an embodiment of the present invention;
FIG. 5B schematically shows a plot of off-plane displacement plotted against the position of a point in the measurement field, taken from the phase line 0-Z in the off-plane displacement plot of the surface of FIG. 5A;
FIG. 5C schematically shows a map of the surface radius for each point in the measurement field calculated based on the out-of-plane displacement of the surface of FIG. 5A;
fig. 5D schematically shows a graph of the change in surface radius with position of a point in the measurement field, based on fig. 5C.
[ reference numerals ]
1-pixel polarization camera
a-micro polarizer array
b-photosensitive chip
2-high temperature optical lens barrel
3-half-transparent reflector
4-reflecting mirror
5-first polarizer
6-second polarizer
7-high temperature vessel interface
8-one virtual camera
9-second virtual camera
10-stroboscopic light source
11-arc reflector
D-object under test
L1Virtual image light center line of-1
L2Virtual image light core line No. two
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 schematically shows a structure diagram of a vision device according to an embodiment of the present invention. As shown in fig. 1, the vision device includes:
and the pixel polarization camera 1 is arranged outside the high-temperature narrow cavity. The pixel polarization camera 1 is a camera that senses only polarized light in a specific direction. The asymmetry of the vibration direction of light with respect to the propagation direction is referred to as the polarization of the light. Polarizers are common optical elements that study the polarization of light and allow only light with a polarization direction that is consistent with its polarization analysis direction to pass through. The pixel polarization camera 1 can be a single target surface pixel polarization camera, for example, and can shoot 30-200 frames of images per second, and can be used for low-cost and low-speed measurement.
The pixel polarization camera 1 is provided with a photosensitive chip b, and the photosensitive chip b is provided with a micro-polarizer array a. As shown in fig. 2, the size of the micro-polarizer unit of the micro-polarizer array a is the same as the size of the pixel unit of the photosensitive chip b. The micro-polarizer units of the micro-polarizer array a are aligned with the pixel units of the photosensitive chip b one by one.
The polarizing angle of the micro-polarizer in the micro-polarizer array a may be set to 0 degree, 45 degrees, 90 degrees, or 135 degrees, for example, or may be set to 0 degree, 45 degrees, 90 degrees, or 135 degrees according to actual requirements. Therefore, the pixel polarization camera 1 can collect the light intensity images of every adjacent 2 × 2 cells of the image after the light passes through the polarization analyzing directions of 0 °, 45 °, 90 ° and 135 ° polarization plates, respectively. The polarization direction can be obtained by processing the polaroid according to the requirement. In one embodiment, the light intensity image of 0 degree and 90 degree pixel can be used, and the pixel polarization camera of the dual-angle polarizer array of 0 degree and 90 degree can be used.
The high-temperature optical lens barrel 2 is arranged in the high-temperature narrow cavity, the semi-transparent reflector 3, the reflector 4, the first polarizer 5 and the second polarizer 6 are arranged in the high-temperature optical lens barrel 2, and the polarization angle of the first polarizer 5 is orthogonal to that of the second polarizer 6. The high temperature optical barrel 2 is provided with a semi-transparent reflector 3, and the parts of the reflector 4, the first polarizer 5 and the second polarizer 6 are embedded in a high temperature container interface 7.
The light reflected by the object is polarized by the first polarizer 5, then reflected by the semi-transparent reflector 3, and enters the pixel polarization camera 1 for imaging. The light reflected by the object is polarized by the second polarizer 6, then reflected by the reflector 4, and enters the pixel polarization camera 1 for imaging.
And the stroboscopic illumination system is used for setting the exposure time of the pixel polarization camera 1 in the imaging process.
In the process of imaging the blade actually, the exposure time of the camera may affect the synchronization problem and the picture quality problem of imaging. For example, in two super-high speed cameras with a sampling frequency of F Hz (2 khz), the shutter start time must have an F-th of a second error for the same synchronous external trigger signal, and this random error is determined by the respective clock asynchronism inside the cameras and cannot be eliminated. Assuming that the blade operates at 15000RPM and operates at a position 0.25m away from the rotation center, the displacement difference of 200 micrometers (2 pi 0.25m 250/s 20000-1s) can be generated by an error of two ten-thousandth of a second (sampling frequency of the camera), and the displacement error not only blurs an observed image, but also disables the full-field three-dimensional reconstruction of the dual camera, so that the strain measurement cannot be carried out. Considering that the blade is operating at a radius of 0.25 meters from the center of rotation, rotating at 15000RPM, the linear displacement produced by the blade per microsecond is approximately 4 microns. At an acquisition speed of 20000FPS, if the exposure time is set up to 1/20000 seconds, the line displacement is close to 200 microns, which can result in severe picture blur. The line displacement can be reduced to less than 0.1 μm by reducing the exposure time to 12 ns. High speed cameras typically cannot set shutter times as low as on the order of 10ns, even though the shutter time can be reduced to 12ns, such fast shutter times can suffer from severe underexposure and the synchronization errors mentioned above with conventional continuous illumination systems.
Therefore, the vision apparatus in the present embodiment adds a stroboscopic illumination system for setting the exposure time of the pixel polarization camera 1 during imaging.
Fig. 3 schematically shows a block diagram of a stroboscopic illumination system provided in an embodiment of the present invention. As shown in fig. 3, the stroboscopic illumination system may comprise, for example, a stroboscopic light source 10, a control module, a stroboscopic light source driving circuit, and a stroboscopic detection module. The control module can be used for controlling the stroboscopic light source driving circuit to drive the stroboscopic light source to emit light flickering according to a preset frequency according to the instruction so as to control the exposure time of the pixel polarization camera 1 in the imaging process; the strobe detection module may be configured to measure the light that flashes at a predetermined frequency.
The control module can comprise an embedded microprocessor and a programmable logic array chip, for example, the periphery of the control module comprises a computer input interface and a TTL level trigger input interface, and the TTL level trigger output interface. The microprocessor of the control module can be used for receiving and processing instructions input by the computer, including the duration of exposure time, the trigger delay of exposure, the output synchronous delay and the exposure working mode. The exposure working mode mainly refers to the single exposure after triggering or the autonomous exposure with a certain frequency. The FPGA chip of the control module can be used for precise delay control. The main control system uses the FPGA to match with a temperature compensation crystal oscillator (TCXO) or an oven controlled crystal oscillator (OCXO), the time accuracy can be controlled within 0.001%, and the time resolution reaches 4 nanoseconds.
The stroboscopic light source 10 may employ, for example, a high-speed LED. The LED can be a white LED, and can also be an LED with a specific wavelength selected according to requirements. The LED can use a high-power LED chip of CREE company, and the power of the LED can reach about 100 watts. Meanwhile, a high-power red light or near-infrared LED or even a laser light source with higher switching speed can be selected, and a driving circuit of the laser diode is consistent with that of the LED. Wherein, the light emitted from the stroboscopic light source 10 can enter the light path through the arc-shaped reflector 11.
The strobe light source driving circuit may include, for example, an adjustable power supply, a high speed field effect transistor, and a high speed field effect transistor driver. The working current and the applied voltage of the high-power LED in the working interval are approximately in direct proportion, and the adjustable power supply is set to be that the voltage suitable for the LED to work can be close to the equivalent high-current constant current source. An adjustable power supply module with power supply capacity of more than 18V 20A is generally required. The switch of the constant current source mainly depends on a high-speed MOSFET, and the MOSFET receives high-current grid charging or discharging and can completely turn on or turn off the LED in a very short time. A specific model, for example CSD17308 from TI corporation, may turn 40A of pulsed operating current on or off within 5 ns. Nowadays, MOS tubes develop rapidly, and conventional low-internal-resistance large-current MOS tubes of companies such as AO and the like can also realize switching action within 20 ns. The ultra-high speed field effect transistor driver is used for driving the grid electrode of the field effect transistor at a high speed. For example, DEIC420 from IXYS corporation, whose MOS drive current can reach 20A. The LED power supply can complete the switching action of the LED power supply within 7ns by matching with a high-speed MOS tube. The light emitting and turning-off speed of the high-power LED depends on the charging speed of a driving system and the capacitance of the LED. Conventional LEDs, in conjunction with the high speed switching system above, can typically complete a duty cycle of 200ns from power-up to full operation to power-down. With the above switch system, the control of the working period of the red or near infrared high-speed LED flashing can be controlled within 15 ns.
The strobe detection module may include, for example, a transimpedance operational amplifier and a silicon photodiode. For example, a light intensity measuring system with the amplification rate lkV/A constructed by combining a high-speed transimpedance operational amplifier such as LTC6268 and the like with a high-speed silicon photodiode such as BPW34 and the like can distinguish light pulses within 50ns and can effectively and dynamically measure the duration and the continuous light intensity of a pulse light system by matching with a conventional oscilloscope, wherein the amplification rate lkV/A is higher than that of the light intensity measuring system with the bandwidth of 10Mhz or more.
Based on the sizes of the semi-transparent reflector 3, the reflector 4, the first polarizer 5 and the second polarizer 6, the outer diameter of the high-temperature optical lens barrel 2 can be set to be 1 cm to 2 cm, and the optical path volume is small. Namely, the visual device can meet the requirement of 1 cm to 2 cm of workpiece opening.
The principle that the vision device detects the objects in the high-temperature narrow cavity is as follows:
a diffuse reflection light of an object D to be measured in the high-temperature narrow cavity is polarized by the first polarizer 5 and then reflected by the semi-transparent reflector 3 to enter the pixel polarization camera 1. The other diffuse reflection light of the object D to be measured is polarized by the second polarizer 6, then is reflected by the reflector 4, and enters the pixel polarization camera 1. Because the polarization detection angles of the first polarizer 5 and the second polarizer 6 are orthogonal, the two diffuse reflection light rays are captured and imaged by orthogonal polarization pixels in the pixel polarization camera 1, and a first picture and a second picture with different viewing angles are obtained by respectively extracting the orthogonal pixels in a later period. Virtual images of the pixel polarization camera 1 are respectively made along the semi-transparent reflector 3 and the reflector 4, so that a first virtual camera 8 and a second virtual camera 9 shown in fig. 1 are obtained. The first frame and the second frame are respectively equal to the first virtual camera 8 and the second virtual camera 9 along the first virtual image light axis L1And a virtual image light axis L2The surface of the object D to be measured is observed. The first picture and the second picture of different visual angles obtained by the camera can obtain the appearance, displacement and deformation information of the surface of the object D to be measured through a digital image correlation algorithm.
Fig. 4 schematically shows a structure diagram of a vision device according to an embodiment of the present invention. As shown in fig. 4, the ocular device differs from the ocular device shown in fig. 1 in that: the pixel polarization camera 1 of the vision device may be, for example, a dual high-speed camera based on polarization beam splitting, which may include a beam splitter, a pair of polarizers aligned with the first polarizer 5 and the second polarizer 6, and two high-speed cameras, and the cameras may capture 2 to 50 ten thousand frames of images per second, and may be used for high-speed measurement.
Other parts of the embodiment refer to the embodiment of the visual device shown in fig. 1, and are not described herein again.
The visual device can be used for detecting objects in an aircraft engine and the like. Based on above-mentioned vision device, can satisfy work piece trompil 1 ~ 2 centimetres, observe the requirement of 5 ~ 6 centimetres of blade length. The utility model relates to an embodiment has carried out the measurement experiment to 55mm semi-diameter PVC pipe, and the experimental result is shown as 5A-5D, can see out from the picture, utilizes the embodiment of the utility model provides a size of the PVC pipe that the vision device records is only 0.11% rather than actual size's relative error, and measurement accuracy is high.
The embodiment of the utility model provides a through set up bireflectance mirror and bipolarization mirror in high temperature optics section of thick bamboo mirror, constitute small and bear the light path that high temperature ability is strong, satisfy the inside measuring of the narrow cavity of high temperature, the light path that can export different visual angles provides the outside camera of high temperature cavity. Meanwhile, the single camera is a pixel polarization camera, can obtain binocular pictures, has a wide visual angle of the whole target surface, realizes measurement of the related morphology, displacement and deformation of the three-dimensional digital image in the high-temperature interior by small-volume equipment, can select the single-target-surface pixel polarization camera or a dual high-speed camera based on polarization beam splitting, and meets the requirements of low-speed measurement and high-speed measurement.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A vision device for object detection inside high temperature narrow cavities, comprising:
the pixel polarization camera (1) is arranged outside the high-temperature narrow cavity;
the high-temperature optical lens barrel (2) is arranged inside the high-temperature narrow cavity, a semi-transparent reflector (3), a reflector (4), a first polarizer (5) and a second polarizer (6) are arranged inside the high-temperature optical lens barrel (2), and the polarization angle of the first polarizer (5) is orthogonal to that of the second polarizer (6);
the light reflected by the object is polarized by the first polarizer (5), then reflected by the semi-transparent reflector (3) and enters the pixel polarization camera (1) for imaging; the light reflected by the object is polarized by the second polarizer (6), then reflected by the reflector (4) and enters the pixel polarization camera (1) for imaging;
a stroboscopic illumination system for setting an exposure time of the pixel-polarized camera (1) during imaging.
2. The visual arrangement according to claim 1, wherein the pixel polarization camera (1) is a single-target pixel polarization camera or a dual high-speed camera based on polarization splitting.
3. The vision device of claim 2, wherein said single target surface pixel polarization camera can take 30-200 frames per second, and said dual high speed polarization beam splitting based camera can take 2-50 ten thousand frames per second.
4. The vision apparatus of claim 2, wherein said dual high-speed camera based on polarization splitting comprises a splitting device, a pair of polarizers, and two high-speed cameras.
5. The vision apparatus of claim 1, wherein said stroboscopic illumination system comprises:
the stroboscopic light source comprises a stroboscopic light source (10), a control module, a stroboscopic light source driving circuit and a stroboscopic detection module;
the control module is used for controlling the stroboscopic light source driving circuit to drive the stroboscopic light source to emit light flickering according to a preset frequency according to an instruction so as to control the exposure time of the pixel polarization camera (1) in the imaging process;
the stroboscopic detection module is used for measuring the light flickering according to the preset frequency.
6. The vision apparatus of claim 5, wherein the control module comprises an embedded microprocessor and a programmable logic array chip.
7. The vision apparatus of claim 5, wherein said strobed light source driver circuit comprises an adjustable power supply, a high speed FET and a high speed FET driver.
8. The vision apparatus of claim 5, wherein said strobe detection module comprises a transimpedance operational amplifier and a silicon photodiode.
9. The vision apparatus of claim 5, wherein said stroboscopic illumination system further comprises:
and the arc-shaped reflector (11) is used for guiding the light rays emitted by the stroboscopic light source (10) into the high-temperature optical lens barrel (2).
10. The visual device according to claim 1, wherein the outer diameter of the high temperature optical barrel (2) is sized from 1 cm to 2 cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921855134.6U CN211352275U (en) | 2019-10-30 | 2019-10-30 | Visual device for detecting inside of high-temperature narrow cavity |
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| CN201921855134.6U CN211352275U (en) | 2019-10-30 | 2019-10-30 | Visual device for detecting inside of high-temperature narrow cavity |
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