Imaging method of high-temperature wind tunnel
阅读说明:本技术 高温风洞的成像方法 (Imaging method 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方法。包括:判断高温风洞是否处于加热状态;当处于加热状态时通过图像采集装置采集待检测材料的图像,将待检测材料的图像传至处理装置;通过温度采集装置采集待检测材料的表面温度,将待检测材料的表面温度传送至处理装置;处理装置根据待检测材料的图像获取感兴趣区域图像,计算感兴趣区域图像的灰度值,将其传至补光控制装置;补光控制装置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,将补光控制信号传至补光装置;补光装置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 method of a high-temperature wind tunnel. The method comprises the following steps: judging whether the high-temperature wind tunnel is in a heating state or not; when the material is in a heating state, acquiring an image of the material to be detected through an image acquisition device, and transmitting the image of the material to be detected to a processing device; collecting the surface temperature of the material to be detected through a temperature collecting device, and transmitting the surface temperature of the material to be detected to a processing device; the processing device acquires an image of the region of interest according to the image of the material to be detected, calculates the gray value of the image of the region of interest, and transmits the gray value to the light supplement control device; the light supplement control device 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 transmits the light supplement control signal to the light supplement device; and the light supplementing device 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. The imaging method of the high-temperature wind tunnel is characterized in that imaging is realized through an imaging system, the imaging system comprises an image acquisition device, a temperature acquisition device, a processing device, a light supplement control device and a light supplement device, and the imaging method of the high-temperature wind tunnel comprises the following steps:
(1) judging whether the high-temperature wind tunnel is in a heating state or not;
(2) when the high-temperature wind tunnel is judged to be in a heating state, acquiring an image of the material to be detected through an image acquisition device, and transmitting the acquired image of the material to be detected to the processing device; collecting the surface temperature of the material to be detected through a temperature collecting device, and transmitting the collected surface temperature of the material to be detected to the processing device;
(3) the processing device acquires an image of an interested area according to the image of the material to be detected, calculates the gray value of the image of the interested area, and transmits the gray value of the image of the interested area to the light supplement control device;
(4) the light supplement control device 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 transmits the light supplement control signal to the light supplement device;
(5) and the light supplementing device supplements light to the material to be detected according to the light supplementing control signal.
2. A method for imaging a high temperature wind tunnel according to claim 1, further comprising the following steps after step (1):
when the high-temperature wind tunnel is judged to be in an unheated state, acquiring an image of a material to be detected through an image acquisition device, and transmitting the acquired image of the material to be detected to a processing device;
the processing device acquires an image of an interested area according to the image of the material to be detected, calculates the average gray value of the image of the interested area, and compares the average gray value of the image of the interested area with a preset threshold value;
when the average gray value of the image of the region of interest is larger than the preset threshold value, the light supplement control device generates a reduced light supplement control signal; transmitting the reduced light supplement control signal to the light supplement device;
and the light supplementing device supplements light to the material to be detected and reduces the light supplementing power according to the light supplementing reduction control signal.
3. The method for imaging a high temperature wind tunnel according to claim 2, wherein after comparing the average gray scale value of the image of the region of interest with a preset threshold value, the method further comprises:
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 transmits the increased light supplement control signal to the light supplement device;
and the light supplementing device supplements light to the material to be detected, and increases the light supplementing power according to the increased light supplementing control signal.
4. A method of imaging a high temperature wind tunnel according to claim 1, further comprising:
the processing device generates 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 transmits the light supplement control signal to the image acquisition device;
and the image acquisition device controls the exposure time according to the exposure control signal.
5. A method of imaging a high temperature wind tunnel according to claim 1 wherein said imaging system further comprises a fixture; the method further comprises the following steps:
and the fixing device is used for fixing the image acquisition device, the temperature acquisition device and the light supplement device on the outer wall of the high-temperature wind tunnel.
6. A method according to claim 5, wherein said fixing 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.
7. The method according to claim 6, wherein said fixing 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.
8. The method according to claim 7, 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.
9. The method according to claim 7, 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.
10. The method according to claim 7, 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 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 a high temperature wind tunnel imaging system and method for the problem that the image brightness variation gradient is large, and further the quality of the image of the material to be detected is seriously affected.
An imaging method of a high-temperature wind tunnel realizes imaging through an imaging system, the imaging system comprises an image acquisition device, a temperature acquisition device, a processing device, a light supplement control device and a light supplement device, and the imaging method of the high-temperature wind tunnel comprises the following steps: (1) judging whether the high-temperature wind tunnel is in a heating state or not; (2) when the high-temperature wind tunnel is judged to be in a heating state, acquiring an image of the material to be detected through an image acquisition device, and transmitting the acquired image of the material to be detected to the processing device; collecting the surface temperature of the material to be detected through a temperature collecting device, and transmitting the collected surface temperature of the material to be detected to the processing device; (3) the processing device acquires an image of an interested area according to the image of the material to be detected, calculates the gray value of the image of the interested area, and transmits the gray value of the image of the interested area to the light supplement control device; (4) the light supplement control device 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 transmits the light supplement control signal to the light supplement device; (5) and the light supplementing device supplements light to the material to be detected according to the light supplementing control signal.
In one embodiment, the method further comprises the following steps after the step (1): when the high-temperature wind tunnel is judged to be in an unheated state, acquiring an image of a material to be detected through an image acquisition device, and transmitting the acquired image of the material to be detected to a processing device; the processing device acquires an image of an interested area according to the image of the material to be detected, calculates the average gray value of the image of the interested area, and compares the average gray value of the image of the interested area with a preset threshold value; when the average gray value of the image of the region of interest is larger than the preset threshold value, the light supplement control device generates a reduced light supplement control signal; transmitting the reduced light supplement control signal to the light supplement device; and the light supplementing device supplements light to the material to be detected and reduces the light supplementing power according to the light supplementing reduction control signal.
In one embodiment, after comparing the average gray-scale value of the image of the region of interest with a preset threshold, the method further includes: 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; transmitting the increased light supplement control signal to the light supplement device; and the light supplementing device supplements light to the material to be detected, and increases the light supplementing power according to the increased light supplementing control signal.
In one embodiment, the method further comprises: the processing device generates 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 transmits the light supplement control signal to the image acquisition device; and the image acquisition device controls the exposure time according to the exposure control signal.
In one embodiment, the imaging system further comprises a fixture; the method further comprises the following steps: and fixing the image acquisition device, the temperature acquisition device and the light supplement device on the outer wall of the high-temperature wind tunnel by using a 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 method 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.
- 上一篇:一种医用注射器针头装配设备
- 下一篇:高温风洞的成像系统