Imaging system of high-temperature wind tunnel
阅读说明:本技术 高温风洞的成像系统 (Imaging system of high-temperature wind tunnel ) 是由 黄浦 王显 于 2018-07-09 设计创作,主要内容包括:本发明涉及一种高温风洞的成像系统。包括:温度采集装置采集待检测材料的表面温度并传送至处理装置;图像采集装置采集待检测材料的图像并传至所述处理装置;处理装置当高温风洞处于加热状态时,根据待检测材料的图像获取感兴趣区域图像,并计算感兴趣区域图像的灰度值;补光控制装置获取待检测材料的表面温度以及感兴趣区域图像的灰度值,并根据待检测材料的表面温度以及感兴趣区域图像的灰度值生成补光控制信号;以及补光装置接收补光控制信号,并根据补光控制信号对待检测材料进行补光。通过设置补光装置能够对待检测材料的图像进行补偿,进一步的能够适应大幅度的温度变化,提高待检测材料的图像的质量。(The invention relates to an imaging system of a high-temperature wind tunnel. The method comprises the following steps: the temperature acquisition device acquires the surface temperature of the material to be detected and transmits the surface temperature to the processing device; the image acquisition device acquires an image of the material to be detected and transmits the image to the processing device; when the high-temperature wind tunnel is in a heating state, the processing device acquires an image of the region of interest according to the image of the material to be detected and calculates the gray value of the image of the region of interest; 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.)
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 temperature acquisition device is used for acquiring the surface temperature of the material to be detected and transmitting the surface temperature of the material to be detected to the processing device;
the image acquisition device is used for acquiring an image of the material to be detected in the high-temperature wind tunnel and transmitting the acquired image of the material to be detected to the processing device;
the processing device is connected with the image acquisition device and the temperature acquisition device and is used for 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 when the high-temperature wind tunnel is in a heating state;
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
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.
2. An imaging system for a high temperature wind tunnel according to claim 1,
and the processing device is also used for 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 when the high-temperature wind tunnel is in an unheated state.
3. An imaging system for a high temperature wind tunnel according to claim 2,
the processing device is further used for comparing the average gray value of the image of the region of interest with a preset threshold value;
when the average gray value of the image of the region of interest is greater than the preset threshold value, the light supplement control device is used for generating a reduced light supplement control signal, and the light supplement device is used for supplementing light to the material to be detected and receiving the reduced light supplement control signal to reduce light supplement power;
when the average gray value of the image of the region of interest is smaller than the preset threshold, the light supplement control device is used for generating an increased light supplement control signal, and the light supplement device is used for supplementing light to the material to be detected and receiving the increased light supplement control signal to increase light supplement power.
4. The imaging system of a high temperature wind tunnel according to claim 1, wherein the temperature acquisition device and the image acquisition device synchronously acquire the surface temperature of the material to be detected and the image of the material to be detected.
5. The imaging system of a high temperature wind tunnel according to claim 1, wherein 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 capturing device controls the exposure time according to the exposure control signal.
6. The imaging system of a high temperature wind tunnel according to 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.
7. An imaging system for a high temperature wind tunnel according to claim 6, wherein said fixture means 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.
8. The imaging system of a high temperature wind tunnel of claim 7, wherein said mounting 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 cross rod and the vertical rod are perpendicular to each other and are connected with the wind tunnel fixing rod through fixing blocks.
9. The imaging system of a high temperature wind tunnel according to claim 8, wherein said 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 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.
10. The imaging system of a high temperature wind tunnel according to claim 8, wherein said second fixing 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.
11. The imaging system of a high temperature wind tunnel according to claim 8, wherein said third fixing 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.
Technical Field
The invention relates to the technical field of engineering materials, in particular to an imaging system 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
Therefore, it is necessary to provide an imaging system of a high-temperature wind tunnel for solving the problem that the image brightness change gradient is large, and the quality of the image of the material to be detected is further seriously influenced.
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 temperature acquisition device is used for acquiring the surface temperature of the material to be detected and transmitting the surface temperature of the material to be detected to the processing device; the image acquisition device is used for acquiring an image of the material to be detected in the high-temperature wind tunnel and transmitting the acquired image of the material to be detected to the processing device; the processing device is connected with the image acquisition device and the temperature acquisition device and is used for 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 when the high-temperature wind tunnel is in a heating state; 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 used for receiving a light supplementing control signal and supplementing light to the material to be detected according to the light supplementing control signal.
In one embodiment, the processing device is further configured to, when the high-temperature wind tunnel is in an unheated state, obtain an image of a region of interest according to the image of the material to be detected, and calculate an average gray value of the image of the region of interest.
In one embodiment, the processing device is further configured to compare the average gray-scale value of the image of the region of interest with a preset threshold; when the average gray value of the image of the region of interest is greater than the preset threshold value, the light supplement control device generates a reduced light supplement control signal, and the light supplement device is used for supplementing light to the material to be detected and receiving the reduced light supplement control signal to reduce light supplement power; and when the average gray value of the image of the region of interest is smaller than the preset threshold value, the light supplement control device generates an increased light supplement control signal, and the light supplement device is used for supplementing light to the material to be detected and receiving the increased light supplement control signal to increase light supplement power.
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 imaging system of the high temperature wind tunnel further includes: 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, 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 cross rod and the vertical rod are perpendicular to each other and are connected with the wind tunnel fixing rod 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 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.
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.
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 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.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further 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 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
Specifically, the
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
Preferably, the fixing device 400 includes: a fixing
Specifically, the fixing
Specifically, the
Specifically, the
Specifically, the
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, there is provided a method for imaging a high temperature wind tunnel, 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, selects an image within a preset range as an interested area image by taking the material to be detected as a center in the image of the material to be detected, calculates the gray value of each pixel point of the interested area image, and calculates the average gray value of the interested area image 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.
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