CN110186641B - Knife edge monitoring control system and method convenient for schlieren system light path debugging - Google Patents
Knife edge monitoring control system and method convenient for schlieren system light path debugging Download PDFInfo
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- CN110186641B CN110186641B CN201910403385.9A CN201910403385A CN110186641B CN 110186641 B CN110186641 B CN 110186641B CN 201910403385 A CN201910403385 A CN 201910403385A CN 110186641 B CN110186641 B CN 110186641B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000006073 displacement reaction Methods 0.000 claims abstract description 37
- 230000003287 optical effect Effects 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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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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Abstract
The invention relates to a knife edge monitoring control system and method convenient for schlieren system light path debugging, which mainly solves the problems of complex process and lower adjusting precision caused by frequent manual adjustment of the cutting quantity of a knife edge in the existing system. The system comprises an electric knife edge, a knife edge monitoring camera, a knife edge controller, a six-degree-of-freedom adjusting platform, a knife edge displacement driving motor and an image processor; the electric knife edge is arranged on the six-degree-of-freedom adjusting platform; the knife edge controller controls the size of the electric knife edge and adjusts the size parameters of the electric knife edge; the knife edge monitoring camera images a spot image at the electric knife edge and sends the collected knife edge image to the image processor, and the image processor is respectively connected with the knife edge controller and the knife edge displacement driving motor; the knife edge displacement driving motor is connected with the six-degree-of-freedom adjusting platform and drives the six-degree-of-freedom adjusting platform to move. Meanwhile, the invention provides a knife edge monitoring control method based on the convenience in schlieren system optical path debugging.
Description
Technical Field
The invention relates to the field of schlieren system monitoring and control, in particular to a knife edge monitoring control system and method convenient for schlieren system optical path debugging.
Background
In the color schlieren system test process, the knife edge is a key component of the schlieren system. The schlieren light source emits light, the light passes through the slit in the shape of a Chinese character kou, the light is collimated by the primary reflector on the first surface and then passes through the flow field, and a corresponding color light source image in the shape of a Chinese character kou is formed at the focal plane of the primary reflector on the second surface. The four edges of the 'kou' -shaped edge are used for respectively cutting corresponding slit images on the focal plane, so that a color schlieren graph reflecting light deflection in two directions is obtained, and the sensitivity of a schlieren system can be changed by adjusting the cutting amount of each edge.
In the working process of the traditional schlieren system, the sensitivity of the system is changed by frequently adjusting the cutting amount of the knife edge manually. The following problems exist with manual adjustment: firstly, the adjusting process becomes complicated, so that the redundant workload of scientific researchers is increased; secondly, the incision cutting amount is expected to be uniform as much as possible under the normal condition, but the human eyes are generally required to judge the cutting amount during manual adjustment, or the human eyes are required to identify the edges of the slit light source images in the shape of the Chinese character 'kou'. At this time, on one hand, because the slit light source image size is smaller, the human eye can not accurately judge the cutting amount; on the other hand, there may be individual differences in judgment among different operators, resulting in a decrease in adjustment accuracy.
Disclosure of Invention
In order to solve the problem of manually adjusting the knife edge in the schlieren system, the invention provides a knife edge monitoring control system and a knife edge monitoring control method which are convenient for the adjustment of the light path of the schlieren system, replaces the conventional manual adjustment, reduces the redundant workload of scientific researchers and ensures the accurate control of the knife edge cutting amount of the schlieren system.
The technical scheme of the invention is as follows:
a knife edge monitoring control system convenient for schlieren system light path debugging comprises an electric knife edge, a knife edge monitoring camera, a knife edge controller, a six-degree-of-freedom adjusting platform, a knife edge displacement driving motor and an image processor; the electric knife edge is arranged on the six-degree-of-freedom adjusting platform; the knife edge controller can control the size of the electric knife edge and adjust the size parameters of the electric knife edge; the knife edge monitoring camera images a light spot image at the electric knife edge and sends the acquired knife edge image to the image processor, and the image processor is respectively connected with the knife edge controller and the knife edge displacement driving motor to realize the control of the knife edge controller and the knife edge displacement driving motor; the knife edge displacement driving motor is connected with the six-degree-of-freedom adjusting platform and controls the movement of the six-degree-of-freedom adjusting platform.
Further, the knife edge monitoring camera is arranged above the side of the electric knife edge, and can be used for carrying out imaging monitoring on light spots at the electric knife edge.
Further, the electric knife edge is provided with four movable knife edge slits in a shape of a Chinese character 'kou'.
Meanwhile, the invention provides a knife edge monitoring control method based on the convenience in schlieren system optical path debugging, which comprises the following steps:
1) The knife edge monitoring camera observes the position of the electric knife edge and the light spot size at the knife edge;
2) The knife edge monitoring camera transmits data to the image processor, and the image processor processes the data to obtain an electric knife edge displacement and an electric knife edge size value;
3) The image processor inputs the electric knife edge displacement to a knife edge displacement driving motor, and inputs the electric knife edge size value to a knife edge controller;
4) The knife edge displacement driving motor and the knife edge controller adjust the position and the size of the electric knife edge;
5) The knife edge moves to realize the cutting of the slit light source image.
Further, in step 2), the image processor processes the data, specifically, graphics processing is performed by MATLAB software of the image processor, and the center position of the knife edge image is determined by using a centroid algorithm.
Compared with the prior art, the invention has the following technical effects:
1. According to the system, the six-degree-of-freedom adjusting platform and the knife edge displacement driving motor are accurately controlled through the image processor, and the knife edge cutting precision is improved, so that the accuracy of a test result is improved, and the quality of the schlieren image is improved.
2. The system provided by the invention can be used for rapidly monitoring the position of the light spot at the incision of the schlieren system, automatically adjusting the position and the size of the incision, and improving the resolution of the schlieren system.
3. The system reduces redundant workload of manual knife edge adjustment of scientific researchers and improves the working efficiency of knife edge adjustment of the schlieren system.
Drawings
FIG. 1 is a schematic diagram of a knife edge monitoring system of the present invention;
FIG. 2 is a flow chart of the system of the present invention.
Reference numerals: 1-electric knife edge, 2-knife edge monitoring camera, 3-knife edge controller, 4-six-freedom degree adjusting platform, 5-knife edge displacement driving motor and 6-image processor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the knife edge monitoring control system convenient for the adjustment of the schlieren system light path provided by the invention comprises an electric knife edge 1, a knife edge monitoring camera 2, a knife edge controller 3, a six-degree-of-freedom adjusting platform 4, a knife edge displacement driving motor 5 and an image processor 6. The electric knife edge 1 is provided with four movable knife edge slits in the shape of a Chinese character 'kou' and is used for cutting light rays in the shape of the Chinese character 'kou' in a schlieren system.
The knife edge monitoring camera 2 is placed above the side of the electric knife edge 1, and can be used for carrying out imaging monitoring on light spots at the electric knife edge 1. The electric knife edge 1 is rigidly fixed on a six-degree-of-freedom adjusting platform 4, and the six-degree-of-freedom adjusting platform 4 drives the electric knife edge 1 to realize the adjustment of six degrees of freedom up, down, left, right, front, back and the like. The image processor 6 can process the image at the electric knife edge 1 and output the displacement of the electric knife edge 1 and the size value of the electric knife edge 1. The image processor 6 is in communication with the knife edge controller 3 and the knife edge displacement driving motor 5, the image processor 6 can send the displacement of the electric knife edge 1 to the knife edge displacement driving motor 5, and can send the size value of the electric knife edge 1 to the knife edge controller 3. The knife edge displacement driving motor 5 can receive the displacement of the electric knife edge 1 sent by the image processor 6, so that the six-degree-of-freedom adjusting platform 4 can be controlled to move, and the six-degree-of-freedom adjusting platform 4 drives the electric knife edge 1 rigidly connected to the six-degree-of-freedom adjusting platform to move. The knife edge controller 3 can receive the size value of the electric knife edge 1 sent by the image processor 6, control the movement of four movable knife edge slits of the shape of the opening of the electric knife edge 1, and adjust the size of the four slits of the shape of the opening of the knife edge, thereby controlling the size of the electric knife edge 1 and realizing the adjustment of the size parameters of the electric knife edge 1. Specific: the knife edge comprises a first blade, a second blade, a third blade and a fourth blade which are horizontally arranged, and a third blade and a fourth blade which are vertically arranged. Four blades form a shape of a Chinese character 'kou', each blade is controlled to move by a respective motor, and the knife edge controller 3 controls the output of the motor so as to control the movement of each blade, thereby achieving the purpose of controlling the knife edge size.
The knife edge monitoring camera 2 images a light spot image at the electric knife edge 1, the knife edge monitoring camera 2 sends the collected knife edge image to the image processor 6, the image processor 6 processes the electric knife edge 1 image to obtain a distance difference between the light spot center position and the electric knife edge 1 center position, and the displacement of the electric knife edge 1 and the size value of the electric knife edge 1 are obtained. The image processor 6 inputs the displacement of the electric knife edge 1 to the knife edge displacement driving motor 5, the knife edge displacement driving motor 5 drives the six-degree-of-freedom adjusting platform 4 to move, and the movement amount of the six-degree-of-freedom adjusting platform 4 is the displacement of the electric knife edge 1, so that the electric knife edge 1 moves to the center of a light spot at the electric knife edge 1. The image processor 6 processes the image of the electric knife edge 1 to obtain the edge position of the light spot at the electric knife edge 1, namely the size value of the electric knife edge 1, the image processor 6 inputs the size value of the electric knife edge 1 to the knife edge controller 3, and the knife edge controller 3 controls the electric knife edge 1 to be adjusted to the size value of the electric knife edge 1.
The invention provides a knife edge monitoring control method convenient for schlieren system light path debugging, which comprises the following steps:
1) The knife edge monitoring camera 2 observes the position of the electric knife edge 1 and the spot size at the knife edge;
2) The knife edge monitoring camera 2 transmits data to the image processor 6, and the image processor 6 processes the data to obtain the displacement of the electric knife edge 1 and the size value of the electric knife edge 1;
In step 2), the image processor 6 processes the data, specifically, graphics processing is performed by MATLAB software of the image processor 6, and the center position of the knife edge image is determined by using a centroid algorithm.
3) The image processor 6 inputs the displacement of the electric knife edge 1 to the knife edge displacement driving motor 5, and inputs the dimension value of the electric knife edge 1 to the knife edge controller 3;
4) The knife edge displacement driving motor 5 and the knife edge controller 3 adjust the position and the size of the electric knife edge 1;
5) The knife edge moves to realize the cutting of the slit light source image.
The system is used for replacing the traditional manual adjustment of the cutting amount of the knife edge. The system monitors the position state of the knife edge in real time through a visible light camera, and controls and adjusts the cutting amount of the knife edge according to the knife edge adjusting amount required by the working of the schlieren system, so that the sensitivity index required by the working is obtained. The method is characterized in that a visible light camera is used for monitoring a knife edge image at the upper side, an image processing technology is used for carrying out image recognition and analysis on the obtained knife edge image, the knife edge is adjusted according to the required knife edge cutting amount, and the knife edge cutting state can be fed back in real time through knife edge monitoring. The system successfully solves the defect of frequent manual adjustment of the incision in the schlieren test process, rapidly, accurately and intelligently realizes schlieren incision adjustment operation, and can be developed, popularized and used in future schlieren system incisions.
Claims (3)
1. A knife edge monitoring control system convenient for schlieren system light path debugging is characterized in that: the device comprises an electric knife edge (1), a knife edge monitoring camera (2), a knife edge controller (3), a six-degree-of-freedom adjusting platform (4), a knife edge displacement driving motor (5) and an image processor (6);
the electric knife edge (1) is arranged on the six-degree-of-freedom adjusting platform (4), and the electric knife edge (1) is provided with four movable knife edge slits in a shape of a Chinese character 'kou';
the knife edge controller (3) is connected with the electric knife edge (1) and is used for adjusting the size parameters of the electric knife edge (1);
The knife edge monitoring camera (2) images a light spot image at the electric knife edge (1) and sends the collected knife edge image to the image processor (6), and the image processor (6) is respectively connected with the knife edge controller (3) and the knife edge displacement driving motor (5) to control the knife edge controller (3) and the knife edge displacement driving motor (5);
The knife edge monitoring camera (2) is arranged above the side of the electric knife edge (1) and is used for carrying out imaging monitoring on light spots at the electric knife edge (1);
The knife edge displacement driving motor (5) is connected with the six-degree-of-freedom adjusting platform (4) and controls the movement of the six-degree-of-freedom adjusting platform (4).
2. The control method of the knife edge monitoring control system for facilitating the adjustment of the schlieren system optical path is based on the control method, and is characterized by comprising the following steps:
1) The knife edge monitoring camera observes the position of the electric knife edge and the light spot size at the knife edge;
2) The knife edge monitoring camera transmits data to the image processor, and the image processor processes the data to obtain an electric knife edge displacement and an electric knife edge size value;
3) The image processor inputs the electric knife edge displacement to the knife edge displacement driving motor and inputs the electric knife edge size value to the knife edge controller;
4) The knife edge displacement driving motor and the knife edge controller adjust the position and the size of the electric knife edge;
5) The knife edge moves to realize the cutting of the slit light source image.
3. The control method of the knife edge monitoring control system for facilitating the adjustment of the optical path of the schlieren system according to claim 2, wherein the control method comprises the following steps: in the step 2), the image processor processes the data, specifically, graphics processing is performed by MATLAB software of the image processor, and the center position of the knife edge image is determined by using a centroid algorithm.
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| CN112284683A (en) * | 2020-11-12 | 2021-01-29 | 华北科技学院 | Method and system for observing wave system evolution process of premixed gas deflagration flow field |
| CN112595497A (en) * | 2021-03-03 | 2021-04-02 | 南京臻恒光学仪器有限公司 | Machine vision-based digital knife edge instrument inspection method and system |
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| CN101403803A (en) * | 2008-10-29 | 2009-04-08 | 清溢精密光电（深圳）有限公司 | Iris diaphragm and diaphragm regulating method |
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