CN110702723B - Imaging system and method for high-temperature wind tunnel - Google Patents
Imaging system and method for high-temperature wind tunnel Download PDFInfo
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- CN110702723B CN110702723B CN201810744890.5A CN201810744890A CN110702723B CN 110702723 B CN110702723 B CN 110702723B CN 201810744890 A CN201810744890 A CN 201810744890A CN 110702723 B CN110702723 B CN 110702723B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/71—Circuitry for evaluating the brightness variation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
Abstract
The invention relates to an imaging system and method of a high-temperature wind tunnel. The method comprises the following steps: the image acquisition device acquires images of the material to be detected in the high-temperature wind tunnel in real time; the temperature acquisition device and the image acquisition device synchronously acquire the surface temperature of the material to be detected; the processing device receives the image of the material to be detected and the surface temperature of the material to be detected, obtains an interested area image according to the image of the material to be detected, and calculates the gray value of the interested area image; the light supplement control device acquires the surface temperature of the material to be detected and the gray value of the image of the region of interest, and generates a light supplement control signal according to the surface temperature of the material to be detected and the gray value of the image of the region of interest; and the light supplementing device receives the light supplementing control signal and supplements light to the material to be detected according to the light supplementing control signal. The light supplementing device can compensate the image of the material to be detected, and further can adapt to large temperature change, so that the quality of the image of the material to be detected is improved.
Description
Technical Field
The invention relates to the technical field of engineering materials, in particular to an imaging system and method of a high-temperature wind tunnel.
Background
The high-temperature wind tunnel can carry out high-temperature ablation oxidation on the detected material, thereby achieving the purpose of detecting the performance of the detected material. Most high-temperature test pieces need to be subjected to high-temperature loading test in a high-temperature wind tunnel. A non-contact high-temperature three-dimensional digital image correlation method (3D-DIC) is a method for performing mechanical measurement on a detected material in a high-temperature wind tunnel. The non-contact high-temperature three-dimensional digital image correlation method (3D-DIC) has the advantages of high precision, no damage, non-contact, large visual field and the like. However, the above method needs to rely on high quality images, so that obtaining high quality images becomes the key of non-contact mechanical measurement.
The prior art is used for placing an imaging device on a tripod when imaging a detected material in a high-temperature wind tunnel, then placing the tripod in front of an observation window of the high-temperature wind tunnel to build an image acquisition platform, and acquiring an image of the detected material in the high-temperature wind tunnel through the observation window by the imaging device. Due to severe temperature change in the high-temperature wind tunnel, the gradient of image brightness change of the material to be detected is large, and the quality of the image of the material to be detected is seriously influenced.
Disclosure of Invention
Based on this, it is necessary to provide an imaging system and method for a high temperature wind tunnel for the problem that the image brightness change gradient is large, and further the quality of the image of the material to be detected is seriously affected.
An imaging system for a high temperature wind tunnel comprising: the device comprises an image acquisition device, a temperature acquisition device, a processing device, a light supplement control device and a light supplement device; the image acquisition device is used for acquiring images of the material to be detected in the high-temperature wind tunnel in real time; the temperature acquisition device is used for synchronously acquiring the surface temperature of the material to be detected with the image acquisition device; the processing device is connected with the image acquisition device and the temperature acquisition device and is used for receiving the image of the material to be detected and the surface temperature of the material to be detected, acquiring an image of an interested area according to the image of the material to be detected and calculating the gray value of the image of the interested area; the light supplement control device is electrically connected with the processing device and used for acquiring the surface temperature of the material to be detected and the gray value of the image of the region of interest and generating a light supplement control signal according to the surface temperature of the material to be detected and the gray value of the image of the region of interest; and the light supplementing device is connected with the light supplementing control device and used for receiving the light supplementing control signal and supplementing light to the material to be detected according to the light supplementing control signal.
In one embodiment, the temperature acquisition device and the image acquisition device acquire the surface temperature of the material to be detected and the image of the material to be detected synchronously.
In one embodiment, the processing device is further configured to generate an exposure control signal according to the surface temperature of the material to be detected and the gray-scale value of the image of the region of interest, and the image acquisition device controls the exposure time according to the exposure control signal.
In one embodiment, the system further comprises: the fixing device is fixedly connected with the outer wall of the high-temperature wind tunnel, and the image acquisition device, the temperature acquisition device and the light supplementing device are connected to the fixing device.
In one embodiment, the fixing device comprises: the fixing device comprises a fixing bracket, a first fixing mechanism, a second fixing mechanism and a third fixing mechanism; the fixed bracket is fixedly connected with the outer wall of the high-temperature wind tunnel; the first fixing mechanism is movably connected with the fixing support, and the image acquisition device is connected with the first fixing mechanism; the second fixing mechanism is movably connected with the fixing support, and the temperature acquisition device is connected with the second fixing mechanism; the third fixing mechanism is movably connected with the fixing support, and the light supplementing device is connected with the third fixing mechanism.
In one embodiment, the fixing bracket includes: the wind tunnel fixing device comprises at least one wind tunnel fixing rod and a plurality of fixing blocks, and further comprises a cross rod and/or a vertical rod; the wind tunnel fixing rod is perpendicular to the outer wall of the high-temperature wind tunnel and is connected with the outer wall of the high-temperature wind tunnel through a fixing block; the transverse rods and the vertical rods are perpendicular to each other and are connected with the wind tunnel fixing rods through fixing blocks.
In one embodiment, the first fixing mechanism comprises: the camera comprises at least one first fixing rod, at least one camera holder and at least one fixing block; the image acquisition device comprises at least one image acquisition mechanism; one end of the first fixed rod is movably connected with the transverse rod or the vertical rod through a fixed block, and the camera holder is fixedly arranged at the other end of the first fixed rod; the camera cloud deck is fixedly connected with the image acquisition mechanism and used for adjusting the image acquisition angle of the image acquisition mechanism.
In one embodiment, the second fixing mechanism includes: the second fixing rod, the first clamp and the fixing block; one end of the second fixed rod is movably connected with the transverse rod or the vertical rod through a fixed block, and the first clamp is fixedly arranged at the other end of the second fixed rod; the first clamp is fixedly connected with the temperature acquisition device and used for fixedly arranging the temperature acquisition device at a preset position.
In one embodiment, the third fixing mechanism includes: the third fixing rod, the second clamp and the fixing block; one end of the third fixed rod is movably connected with the transverse rod or the vertical rod through a fixed block, and the second clamp is fixedly arranged at the other end of the third fixed rod; the second fixture is fixedly connected with the light supplementing device and used for fixedly arranging the light supplementing device at a preset position.
A method of imaging a high temperature wind tunnel, the method comprising: acquiring state information of the high-temperature wind tunnel; when the high-temperature wind tunnel is in a heating state, acquiring an image and the surface temperature of a material to be detected in real time; acquiring an interested area image according to the image of the material to be detected, and calculating the gray value of the interested area image; generating a light supplement control signal according to the surface temperature of the material to be detected and the gray value of the region of interest; and adjusting the light supplement power according to the light supplement control signal.
In one embodiment, the method further comprises: when the high-temperature wind tunnel is not in a heating state, acquiring an image of a material to be detected in real time; acquiring an image of the region of interest according to the image of the material to be detected, and calculating the average gray value of the image of the region of interest; comparing the average gray value with a preset threshold value; when the average gray value is larger than a preset threshold value, reducing the light supplement power; and when the average gray value is smaller than the preset threshold value, increasing the light supplement power.
According to the imaging system of the high-temperature wind tunnel, the image acquisition device and the temperature acquisition device are fixedly arranged on the observation window through the fixing device on the outer wall of the high-temperature wind tunnel, so that the image acquisition device and the temperature acquisition device can accurately acquire the image of the material to be detected and the surface temperature of the material to be detected. And acquiring an image of the region of interest according to the image of the material to be detected, calculating the gray value of the image of the region of interest, and further acquiring the image of the material to be detected. And the light supplement control device receives the surface temperature of the material to be detected and the gray value of the image of the region of interest to generate a light supplement control signal, and controls the light supplement device through the light supplement control signal. The light supplementing device can compensate the image of the material to be detected, and further can adapt to large temperature change, so that the quality of the image of the material to be detected is improved.
The imaging system of the high-temperature wind tunnel is integrally fixed on the outer wall of the wind tunnel, and the influence of ground vibration generated by air pressure on the imaging device can be effectively weakened.
Drawings
FIG. 1 is a schematic structural diagram of an imaging system of a high temperature wind tunnel in one embodiment;
FIG. 2 is a schematic structural diagram of an imaging system of a high temperature wind tunnel in another embodiment;
FIG. 3 is a block diagram of an imaging system for a high temperature wind tunnel according to one embodiment;
FIG. 4 is a flowchart of an imaging method of a high temperature wind tunnel according to an embodiment.
Description of the drawings: 100 is an image acquisition device, 200 is a temperature acquisition device, 300 is a processing device, 400 is a fixing device, 410 is a fixing support, 411 is a wind tunnel fixing rod, 412 is a cross rod, 413 is a vertical rod, 420 is a first fixing mechanism, 421 is a first fixing rod, 422 is a camera holder, 430 is a second fixing mechanism, 431 is a second fixing rod, 432 is a first clamp, 440 is a third fixing mechanism, 441 is a third fixing rod, 442 is a second clamp, 450 is a fixing block, 500 is a light supplement control device, and 600 is a light supplement device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The high-temperature alloy and the composite material are widely applied to the fields of aerospace, aviation and the like due to good mechanical property and high-temperature resistance. In particular in the case of aeronautical supersonic flight, the aerodynamic heat to which the aircraft profile is subjected increases with increasing aircraft speed, and in the case of hypersonic flight, the structural material of the aircraft surface oxidizes as a result of aerodynamic ablation. In general, in order to simulate the hypersonic flight environment of an aircraft, a high-temperature simulation experiment is adopted to test the high-temperature resistance of the aircraft structural material, wherein the most important simulation mode is to detect the material structure through a high-temperature wind tunnel. The existing high-temperature wind tunnel is usually a gas pneumatic tunnel and an electric arc wind tunnel
Referring to fig. 1-3, fig. 1 is a schematic structural diagram of an imaging system of a high temperature wind tunnel according to an embodiment; FIG. 2 is a schematic structural diagram of an imaging system of a high-temperature wind tunnel in another embodiment; FIG. 3 is a block diagram of an imaging system of a high temperature wind tunnel in one embodiment.
As shown in fig. 1-3, an imaging system of a high temperature wind tunnel, the high temperature wind tunnel is used for performing a high temperature oxidation ablation test on a material to be detected, the high temperature wind tunnel is provided with an observation window, and the system comprises: the device comprises an image acquisition device 100, a temperature acquisition device 200, a processing device 300, a light supplement control device 500 and a light supplement device 600; the image acquisition device 100 is arranged on the observation window and is used for acquiring an image of the material to be detected in real time; the temperature acquisition device 200 is arranged on the observation window and used for synchronously acquiring the surface temperature of the material to be detected with the image acquisition device 100; the processing device 300 is connected to the image acquisition device 100 and the temperature acquisition device 200, and is configured to receive an image of a material to be detected and a surface temperature of the material to be detected, obtain an image of an area of interest according to the image of the material to be detected, and calculate a gray value of the image of the area of interest; the light supplement control device 500 is connected to the processing device 300, and is configured to acquire the surface temperature of the material to be detected and the gray scale value of the image of the region of interest, and generate a light supplement control signal according to the surface temperature of the material to be detected and the gray scale value of the image of the region of interest; the light supplement device 600 is disposed at the observation window, electrically connected to the light supplement control device 500, and configured to receive a light supplement control signal and supplement light to the material to be detected according to the light supplement control signal.
Specifically, the image acquisition device 100 and the temperature acquisition device 200 are arranged in an observation window of the outer wall of the high-temperature wind tunnel, and are stably fixed on the outer wall of the high-temperature wind tunnel through the fixing device 400. And placing the material to be detected in a high-temperature wind tunnel for high-temperature ablation oxidation. The image of the material to be detected and the surface temperature of the material to be detected are acquired through the image acquisition device 100 and the temperature acquisition device 200 which are arranged on the high-temperature wind tunnel observation window. The image acquisition device 100 photographs the surface of the material to be detected through the observation window to obtain an image of the material to be detected, and transmits the image of the material to be detected to the processing device 300. The temperature acquisition device 200 is aligned to the surface of the material to be detected through the observation window, and the temperature acquisition device 200 and the image acquisition device 100 synchronously acquire the surface temperature of the material to be detected and transmit the surface temperature of the material to be detected to the processing device 300. The image capturing device 100 includes at least one image capturing mechanism, which may be a video camera, preferably a charge coupled device camera (CCD camera), or the like. The temperature acquisition device 200 may be a non-contact temperature sensor, and preferably, may be an infrared thermometer, a pyrometer, or the like. The processing device 300 receives the image of the material to be detected and the surface temperature of the material to be detected, selects an image within a preset range as an image of the region of interest with the material to be detected as the center in the image of the material to be detected, and calculates the gray value of each pixel point of the image of the region of interest. The processing device 300 is connected to the image capturing device 100 and the temperature capturing device 200, and may be electrically connected or wirelessly connected, preferably electrically connected. The processing device 300 is further configured to generate an exposure control signal according to the surface temperature of the material to be detected and the gray-scale value of the region-of-interest image, and the image capturing device 100 controls the exposure time according to the exposure control signal. When a material to be detected is placed in a high-temperature wind tunnel for high-temperature ablation oxidation, temperature changes in the high-temperature wind tunnel are severe, so that the gradient of image brightness changes of the material to be detected is large, the quality of an image of the material to be detected is seriously affected, the light supplementing control device 500 and the light supplementing device 600 need to be arranged, the light supplementing control device 500 obtains the gray value of an image of an area of interest and the surface temperature of the material to be detected through calculation by the processing device 300, a light supplementing control signal is generated according to the surface temperature of the material to be detected and the gray value of the image of the area of interest, the light supplementing control signal is transmitted to the light supplementing device 600, and the light supplementing device 600 is controlled to supplement light the material to be detected. The light supplement control device 500 is connected to the processing device 300 in an electrical or wireless manner, preferably in an electrical manner, and the light supplement control device 500 communicates with the processing device 300 through an RS485 serial interface. The light emitted by the light supplement device 600 passes through the observation window and irradiates the surface of the material to be detected for light supplement. Therefore, the light supplement device 600 is also required to be disposed on the observation window, so that light can irradiate on the surface of the material to be detected through the observation window. The light supplement device 600 may be a light source of any color, preferably a blue light source. When the high-temperature wind tunnel is in a heating state, the light supplement control device 500 generates a light supplement control signal according to the surface temperature of the material to be detected and the gray value of the region of interest, transmits the light supplement control signal to the light supplement device 600, and the light supplement device 600 adjusts the light supplement power according to the light supplement control signal. When the high-temperature wind tunnel is not in a heating state, the light supplement control device 500 compares the average gray value of the image of the region of interest with a preset threshold value; when the average gray value is greater than the preset threshold, sending a light supplement control signal to the light supplement device 600, and reducing light supplement power by the light supplement device 600 according to the light supplement control signal; and when the average gray value is smaller than the preset threshold, sending a light supplement control signal to the light supplement device 600, and increasing the light supplement power by the light supplement device 600 according to the light supplement control signal. The light supplement is generally needed to be carried out on the material to be detected when the image of the material to be detected is obtained in a high-temperature environment, and the filter is arranged between the lens and the camera, so that the interference of radiation light on the collected image is reduced. However, the light supplement device 600 with fixed power cannot adapt to a test with large brightness change, so the light supplement device 600 in this embodiment is the light supplement device 600 with adjustable power, and can adapt to a test with large brightness change.
Preferably, the system further comprises a fixing device fixedly connected with the outer wall of the high-temperature wind tunnel, and the image acquisition device, the temperature acquisition device and the light supplement device are connected to the fixing device.
Specifically, the image acquisition device 100 and the temperature acquisition device 200 are fixed at the observation window of the outer wall of the high temperature wind tunnel by the fixing device 400. The device can avoid the influence on the quality of the collected image caused by the deviation of the lens of the image collecting device 100 due to the vibration generated on the ground when the high-temperature wind tunnel heats the detected material. And when the material to be detected is tested in the high-temperature wind tunnel, the time for installing and debugging the image acquisition device 100 and the temperature acquisition device 200 is limited, the image acquisition device 100 and the temperature acquisition device 200 are fixed on the outer wall of the high-temperature wind tunnel through the fixing device 400, so that the equipment can be installed conveniently and quickly, the debugging time can be saved, and the high-temperature wind tunnel detection efficiency is improved. The fixing device 400 is further configured to fix the light supplement device 600 at an outer wall observation window of the high temperature wind tunnel. Because the size of the observation window of the high-temperature wind tunnel is limited, the image acquisition device 100, the temperature acquisition device 200 and the light supplement device 600 are arranged on the observation window through the fixing device 400, and the installation difficulty can be reduced.
Preferably, the fixing device 400 includes: a fixing bracket 410, a first fixing mechanism 420, a second fixing mechanism 430, and a third fixing mechanism 440; the fixed bracket 410 is fixedly connected with the outer wall of the high-temperature wind tunnel; the first fixing mechanism 420 is movably connected to the fixing bracket 410, and is configured to movably dispose the image capturing device 100 at a preset position of the observation window; the second fixing mechanism 430 is movably connected to the fixing support 410, and is configured to movably dispose the temperature acquisition device 200 at a preset position of the observation window; the third fixing mechanism 440 is movably connected to the fixing bracket 410, and is configured to movably dispose the light supplement device 600 at a preset position of the observation window.
Specifically, the fixing bracket 410 includes: at least one wind tunnel fixing rod 411 and a plurality of fixing blocks 450, and further comprises a cross rod 412 and/or a vertical rod 413; the wind tunnel fixing rod 411 is perpendicular to the outer wall of the high-temperature wind tunnel and is connected with the outer wall of the high-temperature wind tunnel through a fixing block 450; the cross bar 412 and the vertical bar 413 are perpendicular to each other and are connected to the wind tunnel fixing rod 411 through a fixing block 450. The fixing blocks 450 for fixing the wind tunnel fixing rods 411 are high temperature resistant fixing blocks 450, the vertical rods 413 are fixedly arranged on the two wind tunnel fixing rods 411 arranged in the vertical direction, one end of the cross rod 412 is connected with the other wind tunnel fixing rod 411, the other end of the cross rod can be connected with the wind tunnel fixing rod 411 in the vertical screen direction, and the other end of the cross rod can also be fixedly connected with the vertical rods 413 through the fixing blocks 450. Scales are marked on the cross rod 412 and the vertical rod 413, and the first fixing mechanism 420, the second fixing mechanism 430 and the third fixing mechanism 440 can move on the cross rod 412 or the vertical rod 413, so that the positions of the first fixing mechanism 420, the second fixing mechanism 430 and the third fixing mechanism 440 can be further accurately adjusted according to the scales. If the observation window of the high-temperature wind tunnel is large enough, a fixed rod can be used to fix a cross bar 412 through the fixed rod, the first fixing mechanism 420, the second fixing mechanism 430 and the third fixing mechanism 440 are all fixed on the cross bar 412, and scales are marked on the cross bar 412 for accurately adjusting the position; it is also possible to fix a vertical rod 413 by a fixing rod, and fix the first fixing mechanism 420, the second fixing mechanism 430 and the third fixing mechanism 440 on the vertical rod 413, and the vertical rod 413 is marked with scales for precise position adjustment.
Specifically, the first fixing mechanism 420 includes: at least one first fixing rod 421, at least one camera pan-tilt 422, and at least one fixing block 450; one end of the first fixing rod 421 is movably connected with the cross rod 412 or the vertical rod 413 through a fixing block 450, and the other end is fixedly provided with the camera pan-tilt 422; the camera pan-tilt 422 is fixedly connected with the image acquisition mechanism, and is used for fixedly arranging the first image acquisition mechanism at the preset position of the observation window and adjusting the image acquisition angle of the image acquisition mechanism. The number of the first fixing rod 421 and the camera pan-tilt 422 is the same as the number of the image capturing mechanisms of the image capturing apparatus 100. The first fixing rod 421 may be connected to the cross rod 412 or the vertical rod 413, and only the image capturing mechanism needs to be disposed at the observation window. The camera pan-tilt 422 is a supporting device for mounting and fixing the camera, and the image acquisition mechanism is mounted on the camera pan-tilt 422, so that the angle of the image acquisition mechanism can be adjusted, and the acquisition view field can be further adjusted. The first fixed rod 421 is marked with scales, the camera holder 422 can move on the first fixed rod 421, and the position of the image acquisition mechanism can be further adjusted according to the scales.
Specifically, the second fixing mechanism 430 includes: a second fixing rod 431, a first clamp 432 and a fixing block 450; one end of the second fixing rod 431 is movably connected with the cross rod 412 or the vertical rod 413 through a fixing block 450, and the other end of the second fixing rod is fixedly provided with the first clamp 432; the first clamp 432 is fixedly connected with the temperature acquisition device 200, and is used for fixedly arranging the temperature acquisition device 200 at the preset position of the observation window. The second fixing rod 431 may be connected to the cross rod 412 or the vertical rod 413, and it is only necessary to ensure that the temperature collecting device 200 can be disposed at the observation window. The first clamp 432 is used to fix the temperature acquisition device 200, so that the temperature acquisition device 200 is fixedly arranged at a corresponding position to acquire the surface temperature of the material to be detected. Scales are marked on the second fixing rod 431, the first clamp 432 can move on the second fixing rod 431, and the position of the temperature acquisition device 200 can be further adjusted according to the scales.
Specifically, the third fixing mechanism 440 includes: a third fixing rod 441, a second jig 442, and a fixing block 450; one end of the third fixing rod 441 is movably connected with the cross rod 412 or the vertical rod 413 through a fixing block 450, and the other end of the third fixing rod is fixedly provided with the second clamp 442; the second fixture 442 is fixedly connected to the light supplement device 600, and is configured to fixedly set the light supplement device 600 at the preset position of the observation window. The third fixing rod 441 may be connected to the cross rod 412 or the vertical rod 413, and only the light supplement device 600 needs to be disposed on the observation window. The second fixture 442 is used to fix the light supplement device 600, so that the light supplement device 600 is fixedly disposed at a corresponding position, so as to supplement light to the material to be detected. Scales are marked on the third fixing rod 441, the second fixture 442 can move on the third fixing rod 441, and the position of the light supplementing device 600 can be further adjusted according to the scales.
Referring to fig. 4, fig. 4 is a flowchart illustrating an imaging method of a high temperature wind tunnel according to an embodiment.
As shown in fig. 4, an imaging method for a high temperature wind tunnel is provided, which may include the following steps:
step S102: and acquiring state information of the high-temperature wind tunnel.
Specifically, the state information of the high-temperature wind tunnel includes: the high-temperature wind tunnel is in a heating state and the high-temperature wind tunnel is not in the heating state.
Step S104: and when the high-temperature wind tunnel is in a heating state, acquiring the image and the surface temperature of the material to be detected in real time.
Specifically, the image acquisition device shoots the surface of the material to be detected through the observation window to obtain an image of the material to be detected. The temperature acquisition device is aligned to the surface of the material to be detected through the observation window, synchronously acquires the surface temperature of the material to be detected with the image acquisition device, and transmits the surface temperature of the material to be detected to the processing device.
Step S106: and acquiring an image of the region of interest according to the image of the material to be detected, and calculating the gray value of the image of the region of interest.
Specifically, the processing device receives an image of the material to be detected and the surface temperature of the material to be detected, selects an image within a preset range as an interested area image by taking the material to be detected as the center in the image of the material to be detected, and calculates the gray value of each pixel point of the interested area image.
Step S108: and generating a light supplement control signal according to the surface temperature of the material to be detected and the gray value of the region of interest.
Specifically, the light supplement control device generates a light supplement control signal according to the relationship between the surface temperature of the detection material and the gray value of the region of interest, and transmits the light supplement signal to the light supplement module.
Step S110: and adjusting the light supplement power according to the light supplement control signal.
Specifically, the light supplement module adjusts light supplement power according to the received light supplement control signal.
In one embodiment, the method for imaging a high temperature wind tunnel may further include the steps of:
step S202: and when the high-temperature wind tunnel is not in a heating state, acquiring the image of the material to be detected in real time.
Specifically, the image acquisition device shoots the surface of the material to be detected through the observation window to obtain an image of the material to be detected.
Step S204: and acquiring an image of the region of interest according to the image of the material to be detected, and calculating the average gray value of the image of the region of interest.
Specifically, the processing device receives an image of a material to be detected, the image of the material to be detected is taken as a center, the image within a preset range is selected as an interested area image, the gray value of each pixel point of the interested area image is calculated, and the average gray value of the interested area image is calculated according to the gray value of each pixel point of the interested area image.
Step S206: comparing the average gray value with a preset threshold value; when the average gray value is larger than a preset threshold value, reducing the light supplement power; and when the average gray value is smaller than the preset threshold value, increasing the light supplement power.
Specifically, if the region-of-interest image is an 8-bit image, the preset threshold may be set to 125. That is, when the average gray-scale value is greater than 125, the fill-in light power is reduced; and when the average gray value is less than 125, increasing the fill-in power.
According to the imaging system of the high-temperature wind tunnel, the image acquisition device and the temperature acquisition device are fixedly arranged on the observation window through the fixing device on the outer wall of the high-temperature wind tunnel, so that the image acquisition device and the temperature acquisition device can accurately acquire the image of the material to be detected and the surface temperature of the material to be detected. And acquiring an image of the region of interest according to the image of the material to be detected, calculating the gray value of the image of the region of interest, and further acquiring the image of the material to be detected. The light supplement control device receives the surface temperature of the material to be detected and the gray value of the image of the region of interest to generate a light supplement control signal, and the light supplement device is controlled through the light supplement control signal. The light supplementing device can compensate the image of the material to be detected, and further can adapt to large temperature change, so that the quality of the image of the material to be detected is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An imaging system for a high temperature wind tunnel, comprising: the device comprises an image acquisition device, a temperature acquisition device, a processing device, a light supplement control device and a light supplement device;
the image acquisition device is used for acquiring images of the material to be detected in the high-temperature wind tunnel in real time;
the temperature acquisition device is used for acquiring the surface temperature of the material to be detected;
the processing device is connected with the image acquisition device and the temperature acquisition device and is used for receiving the image of the material to be detected and the surface temperature of the material to be detected, acquiring an image of an interested area according to the image of the material to be detected and calculating the gray value of the image of the interested area;
the light supplement control device is connected with the processing device and used for acquiring the surface temperature of the material to be detected and the gray value of the image of the region of interest and generating a light supplement control signal according to the surface temperature of the material to be detected and the gray value of the image of the region of interest; and
the light supplementing device is electrically connected with the light supplementing control device and is used for receiving a light supplementing control signal and supplementing light to the material to be detected according to the light supplementing control signal;
the processing device is further used for generating an exposure control signal according to the surface temperature of the material to be detected and the gray value of the image of the region of interest, and the image acquisition device controls the exposure time according to the exposure control signal.
2. The system of claim 1, wherein the temperature acquisition device acquires the surface temperature of the material to be detected and the image of the material to be detected in synchronization with the image acquisition device.
3. The system of claim 1, further comprising:
the fixing device is fixedly connected with the outer wall of the high-temperature wind tunnel, and the image acquisition device, the temperature acquisition device and the light supplementing device are connected to the fixing device.
4. The system of claim 3, wherein the securing device comprises: the fixing device comprises a fixing bracket, a first fixing mechanism, a second fixing mechanism and a third fixing mechanism;
the fixed bracket is fixedly connected with the outer wall of the high-temperature wind tunnel;
the first fixing mechanism is movably connected with the fixing support, and the image acquisition device is connected with the first fixing mechanism;
the second fixing mechanism is movably connected with the fixing support, and the temperature acquisition device is connected with the second fixing mechanism;
the third fixing mechanism is movably connected with the fixing support, and the light supplementing device is connected with the third fixing mechanism.
5. The system of claim 4, wherein the fixed bracket comprises: the wind tunnel fixing device comprises at least one wind tunnel fixing rod, a plurality of fixing blocks, a cross rod and/or a vertical rod;
the wind tunnel fixing rod is perpendicular to the outer wall of the high-temperature wind tunnel and is connected with the outer wall of the high-temperature wind tunnel through a fixing block; the transverse rods and the vertical rods are perpendicular to each other and are connected with the wind tunnel fixing rods through fixing blocks.
6. The system of claim 5, wherein the first securing mechanism comprises: the camera comprises at least one first fixing rod, at least one camera holder and at least one fixing block;
the image acquisition device comprises at least one image acquisition mechanism;
one end of the first fixed rod is movably connected with the cross rod or the vertical rod through a fixed block, and the camera pan-tilt is fixedly arranged at the other end of the first fixed rod;
the camera cloud deck is fixedly connected with the image acquisition mechanism and used for adjusting the image acquisition angle of the image acquisition mechanism.
7. The system of claim 5, wherein the second securing mechanism comprises: the second fixing rod, the first clamp and the fixing block;
one end of the second fixed rod is movably connected with the transverse rod or the vertical rod through a fixed block, and the first clamp is fixedly arranged at the other end of the second fixed rod;
the first clamp is fixedly connected with the temperature acquisition device and used for fixedly arranging the temperature acquisition device at a preset position.
8. The system of claim 5, wherein the third securing mechanism comprises: the third fixing rod, the second clamp and the fixing block;
one end of the third fixed rod is movably connected with the transverse rod or the vertical rod through a fixed block, and the second clamp is fixedly arranged at the other end of the third fixed rod;
the second fixture is fixedly connected with the light supplementing device and used for fixedly arranging the light supplementing device at a preset position.
9. An imaging method of a high temperature wind tunnel, the method comprising:
acquiring state information of the high-temperature wind tunnel;
when the high-temperature wind tunnel is in a heating state, acquiring an image and the surface temperature of a material to be detected in real time;
acquiring an interested area image according to the image of the material to be detected, and calculating the gray value of the interested area image;
generating a light supplement control signal according to the surface temperature of the material to be detected and the gray value of the region of interest;
adjusting the light supplement power according to the light supplement control signal;
the method further comprises the following steps: and generating an exposure control signal according to the surface temperature of the material to be detected and the gray value of the image of the region of interest, and controlling the exposure time according to the exposure control signal.
10. The method of claim 9, further comprising:
when the high-temperature wind tunnel is not in a heating state, acquiring an image of a material to be detected in real time;
acquiring an image of the region of interest according to the image of the material to be detected, and calculating the average gray value of the image of the region of interest;
comparing the average gray value with a preset threshold value; when the average gray value is larger than a preset threshold value, reducing the light supplement power; and when the average gray value is smaller than the preset threshold value, increasing the light supplement power.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810744890.5A CN110702723B (en) | 2018-07-09 | 2018-07-09 | Imaging system and method for high-temperature wind tunnel |
| CN201811243870.6A CN110702724B (en) | 2018-07-09 | 2018-07-09 | Imaging method of high-temperature wind tunnel |
| CN201811246164.7A CN110702725B (en) | 2018-07-09 | 2018-07-09 | Imaging system of high-temperature wind tunnel |
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| CN201810744890.5A CN110702723B (en) | 2018-07-09 | 2018-07-09 | Imaging system and method for high-temperature wind tunnel |
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| CN201811246164.7A Division CN110702725B (en) | 2018-07-09 | 2018-07-09 | Imaging system of high-temperature wind tunnel |
| CN201811243870.6A Division CN110702724B (en) | 2018-07-09 | 2018-07-09 | Imaging method of high-temperature wind tunnel |
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| CN114697537A (en) * | 2020-12-31 | 2022-07-01 | 浙江清华柔性电子技术研究院 | Image acquisition method, image sensor, and computer-readable storage medium |
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| CN110702724A (en) | 2020-01-17 |
| CN110702723A (en) | 2020-01-17 |
| CN110702724B (en) | 2024-02-20 |
| CN110702725B (en) | 2024-02-20 |
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