CN212231577U - Spectroscopic Stereo Vision Device for Internal Inspection of High Temperature and Narrow Cavity - Google Patents

Abstract

A spectroscopic stereo vision device for detection inside a high-temperature narrow cavity, used for object detection inside a high-temperature narrow cavity, comprising: a color spectroscopic imaging module arranged outside the high-temperature narrow cavity for object imaging; The optical lens barrel is arranged inside the high temperature narrow cavity, and the high temperature optical lens barrel is provided with a half mirror, a reflector, a red spectrum color filter and a blue spectrum color filter, wherein the light of the real image of the object passes through the After being reflected by the reflector, it is filtered by the red spectrum color filter and passed through the half-reflecting mirror, and then enters the color spectroscopic imaging module for imaging; after the light reflected by the object is filtered by the blue spectrum color filter, After being reflected by the mirror, it enters the color spectroscopic imaging module for imaging. By arranging dual mirrors and color spectroscopic devices in the high-temperature optical tube lens, an optical path with small size and strong high temperature capability is formed, which can meet the detection inside the high-temperature narrow cavity, and can output optical paths with different viewing angles to provide the camera outside the high-temperature cavity. .

Description

Spectroscopic Stereo Vision Device for Internal Inspection of High Temperature and Narrow Cavity

technical field

The utility model relates to the field of computer vision and monitoring, in particular to a spectroscopic stereoscopic vision device used for internal detection of a high-temperature narrow cavity.

Background technique

On-line detection of displacement and strain of mechanical components in high temperature environment is widely required but difficult, especially for closed and narrow environments such as aero turbine engines, the space left for testing equipment is very small, and the ambient temperature may be between 500 and 1200 degrees Celsius. The working conditions are very bad. The strain field measurement of its blades under high-speed rotation conditions has always been a key problem that the industry expects to solve.

In conventional stereo digital image correlation or other computer binocular stereo vision applications, two similar cameras need to be used to observe the measured object from a certain stereo perspective. To do this, the camera needs to be secured with a hardware synchronizer and dedicated support brackets that coordinate the simultaneous exposure of the two cameras. Its volume is large and cannot be adapted to the above-mentioned ultra-high temperature and narrow cavity internal detection.

Conventional single-camera binocular detection methods often use a binocular observation device with a split screen to image part of the target surface of the camera, and its viewing angle is relatively limited, which is difficult to meet the constraints of measuring environmental parameters.

Utility model content

In view of this, the main purpose of the present invention is to provide a spectroscopic stereo vision device for detecting the interior of a high temperature narrow cavity, so as to partially solve at least one of the above technical problems.

In order to achieve the above purpose, the present utility model provides a spectroscopic stereo vision device, comprising:

A color spectroscopic imaging module, located outside the high temperature narrow cavity, used for object imaging;

The high-temperature optical lens barrel is arranged inside the high-temperature narrow cavity, and the interior of the high-temperature optical lens barrel is provided with a semi-transmissive mirror, a reflector, a red spectrum color filter and a blue spectrum color filter, wherein the light of the real image of the object passes through the After being reflected by the reflector, it is filtered by the red spectrum color filter and passed through the half-reflecting mirror and then enters the color spectroscopic imaging module for imaging; the light reflected by the object is filtered by the blue spectrum color filter. , and then reflected by the reflecting mirror, entering the color spectroscopic imaging module for imaging.

Wherein, the color spectroscopic imaging module is a CFA Byer array color camera, a 3CCD/CMOS color camera or a discrete color spectroscopic camera.

Among them, the CFA Byer array color camera is a camera whose single pixel is only sensitive to a specific spectrum; the color filter corresponding to the pixel is not installed in the CCD/CMOS, so that a specific pixel can only be sensitive to a specific color light.

The 3CCD/CMOS color camera is a camera mechanism that integrates three sensors with color filters and a beam splitter; it can reconstruct blue, green or Red photosensitive image.

Wherein, the outer diameter of the high temperature optical lens barrel is 1 cm-2 cm.

Based on the above technical solutions, the spectroscopic stereo vision device of the present invention has at least one of the following beneficial effects relative to the prior art:

1. A spectroscopic stereo vision device for high-temperature narrow cavity interior detection proposed by the present utility model, by arranging a double-reflecting mirror and a color spectroscopic device in a high-temperature optical tube lens, a light path with a small volume and a strong ability to withstand high temperature is formed, To meet the detection inside the high temperature narrow cavity, it can output light paths with different viewing angles to provide the camera outside the high temperature cavity.

2. The single camera in the device of the present invention is a color camera, which can obtain a binocular image and has a wide viewing angle of the entire target surface, so as to realize the relevant morphology, displacement and deformation of the three-dimensional digital image inside the high temperature by the small-volume device. Measurement, and the color camera can choose a single target color camera or a 3CCD or dual high-speed cameras based on the color splitting optical path, which can meet the needs of high-precision measurement and high-speed measurement at the same time.

Description of drawings

1 is a schematic structural diagram of a spectroscopic stereo vision device for performing a single-camera test according to an embodiment of the present invention;

Fig. 2 is the imaging principle diagram of the CFAByer array color camera of the present utility model;

Fig. 3 is the imaging principle diagram of the utility model 3CCD/CMOS color camera;

4 is a two-dimensional structural schematic diagram of a spectroscopic stereo vision device for performing dual-camera testing according to an embodiment of the present invention;

Fig. 5 is a three-dimensional side view schematic diagram of an embodiment of the present invention applied to the interior of an aero-engine.

In the above drawings, the meanings of the reference signs are as follows:

1. Color spectroscopic imaging module; 2. High temperature optical lens barrel; 3. Half mirror;

4. Reflector; 5. Red spectrum filter; 6. Blue spectrum filter;

7. High temperature container interface; 8. No. 1 virtual camera; 9. No. 2 virtual camera;

D. Object to be measured; L1, No. 1 virtual image optical center line; L2, No. 2 virtual image optical center line.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

1 is a schematic structural diagram of a spectroscopic stereo vision device for single-camera testing of the present invention; as shown in FIG. 1 , the spectroscopic stereo vision device includes:

The color spectroscopic imaging module 1 is arranged outside the high temperature narrow cavity and is used for object imaging; the color spectroscopic imaging module can be a conventional CFA Byer array color camera, a 3CCD/CMOS camera and a discrete color spectroscopic camera.

The principle of dual-view imaging of CFAByer array color camera and color spectroscopic camera:

A CFA Byer array color camera is a camera in which a single pixel is only sensitive to a specific spectrum of light. As shown in Figure 2, the color filter corresponding to the pixel is installed in the CCD/CMOS, so that a specific pixel can only be sensitive to a specific color light. By reading the patterns under different color filters, blue, green or red light-sensitive images can be reconstructed.

The 3CCD/CMOS color camera is a camera mechanism that integrates three sensors with color filters and a beam splitter. As shown in Figure 3, by reading the sensor data under the three color filters separately, blue, green or red light-sensitive images can be reconstructed.

The high temperature optical lens barrel 2 is arranged inside the high temperature narrow cavity, and the high temperature optical lens barrel is provided with a half mirror 3, a reflector 4, a red spectrum color filter 5 and a blue spectrum color filter 6, wherein the object After the light of the real image is reflected by the reflecting mirror 4, it is filtered by the red spectrum color filter 5 and passes through the half mirror 3 and then enters the color spectroscopic imaging module 1 for imaging; the light reflected by the object passes through the After being filtered by the blue spectrum color filter 6, it is reflected by the reflecting mirror 4 and then enters the color spectroscopic imaging module for imaging.

Based on the dimensions of the half mirror 3, mirror 4, red spectrum filter 5 and blue spectrum filter 6, the outer diameter of the high temperature optical lens barrel 2 can be set to 1 cm to 2 cm, and the optical path volume is small. That is, the vision device can meet the requirements of 1 cm to 2 cm for the opening of the workpiece.

The principle of the spectroscopic stereo vision device for detecting objects inside the high temperature narrow cavity is as follows:

A diffusely reflected light from the object to be measured D inside the high-temperature narrow cavity enters the cavity and is reflected by the mirror 4, then filtered into red light by the red spectrum color filter 5, and then transmitted through the semi-transparent mirror 3 to enter the color spectroscopic imaging. Module 1. Another diffusely reflected light of the object D to be measured is filtered into blue light by the blue spectral color filter 6 , and then reflected by the semi-transmissive mirror 3 to enter the color spectroscopic imaging module 1 . Since the spectra of the red spectral color filter 5 and the blue spectral color filter 6 do not overlap, the two diffusely reflected rays are captured and imaged by the red and blue pixels in the color spectroscopic imaging module 1 that are sensitive to red and blue respectively. The first picture and the second picture with different viewing angles are extracted respectively. A virtual image of the color spectroscopic imaging module 1 is taken along the half mirror 3 and the mirror 4, respectively, to obtain the No. 1 virtual camera 8 and the No. 2 virtual camera 9 as shown in FIG. 1 . The first picture and the second picture are respectively equal to the surface of the object to be measured D observed by the first virtual camera 8 and the second virtual camera 9 along the _first virtual image optical center line L1 and the _second virtual image optical center line L2. The first picture and the second picture of different viewing angles obtained by the camera can be used to obtain the topography, displacement and deformation information of the surface of the object D to be measured through a digital image correlation algorithm.

Example 1

The high temperature optical mirror barrel in the system is buried in the high temperature container interface 7. There is an object to be measured inside the high temperature container. The color spectroscopic imaging part 1 is arranged outside the high temperature narrow cavity; the high temperature optical lens barrel 2 is arranged inside the high temperature narrow cavity, and the above-mentioned high temperature optical lens barrel 2 is provided with a half mirror 3, a reflecting mirror 4, a red spectral filter. The color filter 5 and the blue spectrum color filter 6, wherein, after the light of the real image of the object is reflected by the above-mentioned reflecting mirror 4, it is filtered by the above-mentioned red spectral color filter 5 and passes through the above-mentioned half mirror 3 and then enters the above-mentioned color camera 1. Imaging: after the light reflected by the object is filtered by the blue spectrum color filter 6, it is reflected by the reflecting mirror 3 and enters the color camera 1 for imaging. Through the first and second pictures of different viewing angles obtained by the camera, the topography, displacement and deformation information of the surface of the object to be measured can be obtained through a digital image correlation algorithm.

This embodiment is a single-camera test, and its structure is shown in FIG. 1 .

Example 2

The difference between this embodiment and Embodiment 1 is that a set of color cameras, half mirrors, red spectrum filters and blue spectrum filters are added above the high temperature container interface, which constitutes a dual-camera spectroscopic stereoscopic device , and its schematic diagram is shown in Figure 4.

The above-mentioned spectroscopic stereo vision device can be used for the detection of objects such as the inside of an aero-engine.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included within the protection scope of the present utility model.

Claims (5)

1. A spectroscopic stereo vision device, characterized in that, for object detection inside a high temperature narrow cavity, comprising: A color spectroscopic imaging module, located outside the high temperature narrow cavity, used for object imaging; The high-temperature optical lens barrel is arranged inside the high-temperature narrow cavity, and the interior of the high-temperature optical lens barrel is provided with a semi-transmissive mirror, a reflector, a red spectrum color filter and a blue spectrum color filter, wherein the light of the real image of the object passes through the After being reflected by the reflector, it is filtered by the red spectrum color filter and passed through the half-reflecting mirror and then enters the color spectroscopic imaging module for imaging; the light reflected by the object is filtered by the blue spectrum color filter. , and then reflected by the reflecting mirror, entering the color spectroscopic imaging module for imaging. 2 . The spectroscopic stereo vision device according to claim 1 , wherein the color spectroscopic imaging module is a CFA Byer array color camera, a 3CCD/CMOS color camera or a discrete color spectroscopic camera. 3 . 3. The spectroscopic stereoscopic vision device according to claim 2, wherein the CFA Byer array color camera is a camera whose single pixel only sensitizes a specific spectrum; it is installed in CCD/CMOS and corresponding to the pixel. Color filters that allow certain pixels to only be sensitive to certain colors of light. 4. The spectroscopic stereo vision device according to claim 2, wherein the 3CCD/CMOS color camera is a camera mechanism integrating three color filter sensors and a spectroscopic lens group; The sensor data under the block color filter can reconstruct blue, green or red light sensitive images. 5 . The spectroscopic stereoscopic vision device according to claim 1 , wherein the outer diameter of the high-temperature optical lens barrel is 1 cm-2 cm. 6 .

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