Visual radiation disturbance value scanning test system for high-power electrical equipment

Abstract

The invention discloses a visual radiation disturbance value scanning test system for high-power power equipment. The system comprises a stereo camera, receiving equipment and an upper computer, the stereo camera comprises a binocular camera shooting module and a laser tracking and positioning module; the binocular camera is used for integrally shooting the tested power equipment, taking the shot image as a visible light background image, and dividing the image into size-adjustable grid areas; the laser tracking and positioning module determines the three-dimensional coordinate position of the reflection marking ball on the visible light background image by tracking and positioning the coordinate sensor of the reflection marking ball; the receiving equipment collects a radiation disturbance measurement signal of the measured power equipment through a wireless probe connected with the reflection marking ball; generating a disturbance amplitude value and a quasi-peak value through a spectrum analyzer; and the upper computer is connected with the stereo camera and the spectrum analyzer, and displays a disturbance amplitude value and a quasi-peak value by taking the visible light background image as a background. And the specific disturbance source overrun position of the power equipment with the emission disturbance value overrun can be accurately identified.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic compatibility radiation harassment measurement, and particularly to a visual radiation harassment value scanning test system for high-power electrical equipment. Background Art

[0002] In accordance with relevant standards such as the national standard GB 4824—2019 "Limits and Methods of Measurement of Radio Frequency Disturbance Characteristics of Industrial, Scientific and Medical Equipment", the vast majority of electrical equipment needs to carry out emission tests to measure their radio frequency disturbance characteristics. In the prior art, it is often only possible to determine whether the emission harassment value of the electrical equipment under test exceeds the limit, but it is impossible to specifically determine the specific location of the excessive harassment source in the electrical equipment. Summary of the Invention

[0003] In view of the deficiencies and defects in the prior art, the present invention provides a visual radiation harassment value scanning test system for high-power electrical equipment, which is used to identify the specific excessive position of the harassment source of the electrical equipment with an excessive emission harassment value, so as to facilitate the subsequent optimization of the emission harassment characteristics of the electrical equipment by the electrical equipment production unit. The system includes:

[0004] A stereo camera, a receiving device, and a host computer; wherein,

[0005] The stereo camera includes a built-in binocular camera and a laser tracking and positioning module; it is used to take an overall picture of the electrical equipment under test through the binocular camera, use the taken image as a visible light background image, and divide the visible light background image into grid areas with adjustable sizes; the laser tracking and positioning module determines the three-dimensional coordinate position of the reflection marker ball on the visible light background image through a coordinate sensor that tracks and locates the reflection marker ball.

[0006] The receiving device includes an antenna probe and a spectrum analyzer; it collects the radiation harassment measurement signal of the electrical equipment under test through a wireless probe connected to the reflection marker ball, and transmits the radiation harassment measurement signal to the spectrum analyzer; the spectrum analyzer generates the harassment amplitude and quasi-peak value in the spectrum region of the test frequency band.

[0007] The host computer is connected to the stereo camera and the spectrum analyzer, and displays the harassment amplitude and quasi-peak value with the visible light background image as the background.

[0008] Further, before the step in which the laser tracking and positioning module determines the three-dimensional coordinate position of the reflection marker ball through a coordinate sensor that tracks and locates the reflection marker ball, it further includes: moving the reflection marker ball to scan the surface of the electrical equipment under test in real time.

[0009] Further, the receiving device further includes: a differential amplification device, which is connected to the wireless probe and is used to suppress common-mode interference and noise and provide a processed signal for the spectrum analyzer.

[0010] Furthermore, the spectrum analyzer is connected to a differential amplification device, and generates a disturbance amplitude and a quasi-peak value within the spectrum region of the test frequency band based on the processed signal.

[0011] Furthermore, the host computer further includes a measurement switch for calibrating the initial position of the reflection marker ball.

[0012] Furthermore, the grid side length range of the grid area is set to 1 - 1000 mm, and the depth upper limit to the lower limit is set to -1000 - 1000 mm.

[0013] Furthermore, the wireless probe is connected to the spectrum analyzer through a coaxial cable to transmit the radiation disturbance measurement signal.

[0014] Furthermore, the frequency band coverage of the spectrum analyzer is 30 MHz - 1 GHz, and the scanning time is 1 ms - 16000 s.

[0015] Furthermore, the host computer controls the stereo camera and the spectrum analyzer to perform measurement, data processing, and data storage.

[0016] Furthermore, the host computer synchronously and visually displays the radiation disturbance measurement signal in the visible light coordinate system, and displays the disturbance amplitude with a color - level bar.

[0017] The present invention uses a laser signal with a specific wavelength to locate the three - dimensional spatial position of the reflection ball connecting the antenna probe. The non - contact measurement method has no special limitations on conditions such as the measurement environment and site. The measurement accuracy can reach the millimeter level, the response speed can reach the millisecond level, and it is not affected by the ambient light and other electromagnetic interferences at the measurement site, and can realize the measurement of the disturbance value from the component monomer to the complete product.

[0018] The present invention uses a binocular camera and a vision technology based on the deep - learning YOLO algorithm to generate the visible - light background of the power equipment to be measured target surface. The binocular camera can complete non - contact shooting measurement without moving, so as to facilitate the accurate positioning of the radiation disturbance measurement value over - limit point.

[0019] The present invention uses a differential amplification device to effectively suppress the common - mode interference and noise in a clutter environment, improve the signal - to - noise ratio and anti - interference performance of the input port signal, so as to provide the repeatability and stability of the spectrum analyzer input signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic layout diagram of a visual radiation disturbance value scanning test system for high - power power equipment provided by an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of a test grid involved in an embodiment of the present invention;

[0022] Figure 3 is an example of the measurement test process involved in the embodiments of the present invention;

[0023] Figure 4 is a schematic flow chart of a method for generating a visible light background on the target surface of a power equipment to be measured in a visual radiation harassment value scanning test system for high-power power equipment involved in the embodiments of the present invention. Detailed implementation manners

[0024] Many specific details are set forth in the following description in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementations disclosed below.

[0025] The specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the specific embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0026] It should be noted that in the description of the specification and the claims, certain terms are used to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. The specification and the claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of components as the criterion for distinction. As mentioned throughout the specification and the claims, "comprising" or "including" is an open-ended term and should be interpreted as "including but not limited to". The subsequent description in the specification is for the purpose of describing the preferred implementation manners of the present invention, but the description is for the general purpose of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be defined by the appended claims.

[0027] For the convenience of understanding the embodiments of the present invention, the following will further explain with several specific embodiments as examples in conjunction with the accompanying drawings, and each accompanying drawing does not constitute a limitation to the embodiments of the present invention.

[0028] For better understanding, high power refers to power equipment at the Mvar level with a rated power / output power above 1 Mvar, such as Figure 1 As shown, a visual radiation harassment value scanning test system for high-power power equipment includes a stereo camera, a receiving device, and a host computer; wherein,

[0029] A stereo camera, including a built-in binocular camera and a laser tracking and positioning module; for overall photographing of a power device to be measured through binocular photography, taking the photographed image as a visible light background image, and dividing the visible light background image into grid areas with adjustable sizes; the laser tracking and positioning module determines the three-dimensional coordinate position of a reflection marker ball on the visible light background image through a coordinate sensor for tracking and positioning the reflection marker ball.

[0030] A receiving device, including an antenna probe and a spectrum analyzer; collecting a radiation disturbance measurement signal of the power device to be measured through a wireless probe connected to the reflection marker ball, and transmitting the radiation disturbance measurement signal to the spectrum analyzer; the spectrum analyzer generates disturbance amplitudes and quasi-peak values within a test frequency band spectrum region.

[0031] A host computer, connected to the stereo camera and the spectrum analyzer, and displaying the disturbance amplitudes and quasi-peak values with the visible light background image as the background.

[0032] Before the step of the laser tracking and positioning module tracking and positioning the coordinate sensor of the reflection marker ball, it further includes: moving the reflection marker ball to scan the surface of the power device to be measured in real time. During the test, the tester holds the reflection marker ball to scan the surface of the test item, and the stereo camera internally tracks and positions the coordinate sensor of the reflection marker ball for positioning on the visible light background image.

[0033] A binocular camera unit, which is used for binocular measurement of a power device to be measured to produce a visible light background image.

[0034] A laser positioning unit, which is used for quickly, highly accurately, and non-contact tracking and positioning the three-dimensional spatial position of the reflection marker ball in the visible light background image.

[0035] A receiving device, which includes an antenna probe, which is provided with a reflection marker ball to scan the power device, the laser positioning unit positions the reflection marker ball for positioning on the visible light background image, and the antenna probe collects a radiation disturbance measurement signal.

[0036] The receiving device further includes: a differential amplification device, which is connected to the wireless probe, for suppressing common-mode interference and noise, improving the signal-to-noise ratio and anti-interference performance, and providing a processed signal for the spectrum analyzer.

[0037] The spectrum analyzer, connected to the differential amplification device, generates disturbance amplitudes and quasi-peak values within a test frequency band spectrum region based on the processed signal.

[0038] The host computer further includes: a measurement switch for calibrating the initial position of the reflection marker ball.

[0039] The grid side length range of the grid area is set to 1 - 1000 mm, and the depth upper limit to lower limit is set to -1000 - 1000 mm.

[0040] The wireless probe is connected to the spectrum analyzer through a coaxial cable to transmit the radiation disturbance measurement signal.

[0041] The upper computer controls the stereo camera and the spectrum analyzer for measurement, data processing, and data storage. The upper computer also includes a central processing unit. The upper computer synchronously visualizes and displays the radiation disturbance measurement signal in the visible light coordinate system, and displays the disturbance amplitude with color - graded bars.

[0042] The operation method of the visualization radiation disturbance value scanning test system for high - power electrical equipment includes:

[0043] The binocular camera unit is used for binocular measurement of the power equipment to be measured to generate a visible - light background image;

[0044] Using the stereo camera, reflection marker balls, and measurement switch for visible - light background image position calibration. For the initial calibration, the binocular camera unit of the stereo camera takes an overall shot, and then uses the reflection marker balls to select two points on the diagonal of the measured surface of the power equipment to be measured to establish a spatial plane. During the establishment process, the stereo camera uses the laser positioning unit for tracking, reads the real - time position of the moving reflection marker balls, and displays the spatial coordinate values;

[0045] The handheld mobile antenna probe is transmitted to the spectrum analyzer in the form of an electrical signal to measure the radiation disturbance measurement signal. The spectrum analyzer is connected to the antenna probe to generate the disturbance amplitude and quasi - peak value within the test frequency band spectrum region based on the radiation disturbance measurement signal;

[0046] The upper computer is connected to the stereo camera and the spectrum analyzer, and uses the visible - light background image of the power equipment to be measured as the background to display the disturbance amplitude and quasi - peak value.

[0047] In one embodiment, the visualization radiation disturbance value scanning test system includes a stereo camera and receiving devices, which include a spectrum analyzer, an antenna probe, and a background (including an upper computer and a measurement switch). The stereo camera has two functions: binocular imaging and laser positioning. Binocular imaging is used to take an overall shot of the product under test, and the captured image is used as the visible - light background image of the test sample object, and is divided into a grid area with adjustable size (the grid side length range is 1 - 1000 mm, and the upper and lower limits of the depth are -1000 - 1000 mm) as follows Figure 2As shown in the figure. The laser positioning function is realized by the reflection marker ball (which is combined and connected with the antenna probe). During the test, the tester holds the reflection marker ball and scans the surface of the test piece. The stereo camera internally has a laser to track and position the coordinate sensor of the reflection marker ball, which is used to position on the visible light background image and gives calibration examples of the lower left corner and upper right corner of the test piece. After calibrating the initial position of the reflection marker ball, the X / Y / Z three-axis coordinate positions of the reflection marker ball on the visible light background image can be read in real time as it moves. Figure 3 It is an example of the test process for the tester to measure. Specifically, the receiving device described above includes an antenna probe, a differential amplifier, and a spectrum analyzer. Figure 4 A method for generating a visible light background of a power equipment target to be measured by a binocular camera and the YOLO algorithm, including the following steps:

[0048] Complete binocular image acquisition under the calibrated background;

[0049] Preprocess the left image of the target power equipment using the semi-soft threshold wavelet denoising method, and use the FAST algorithm to extract boundary feature points {Y1, Y2, Y3... Y n};

[0050] Based on the extracted boundary feature points, extract four corner points G1, G2, G3, and G4 through the deep learning algorithm YOLO technology;

[0051] Store the image coordinates of the four corner points of the left image: the upper left vertex G1(x1, y1), the lower left vertex G2(x2, y2), the lower right vertex G3(x3, y3), and the upper right vertex G4(x4, y4);

[0052] Use the NCC matching algorithm to match the four corner points G1 ’ 、G2 ’ 、G3 ’ 、G4 ’ ;

[0053] Store the image coordinates of the four corner points of the right image: the upper left vertex G1’(x1’, y1’), the lower left vertex G2’(x2’, y2’), the lower right vertex G3’(x3’, y3’), and the upper right vertex G4’(x4’, y4’);

[0054] Based on the left and right image coordinates, obtain the three-dimensional coordinates in the world coordinate system according to the principle of triangulation.

[0055] The antenna probe transmits the radiation harassment measurement signal to the differential amplifier through a coaxial cable, and the differential amplifier is connected to the spectrum analyzer.

[0056] The frequency band of the described spectrum analyzer covers 30 MHz - 1 GHz, and the scanning time is 1 ms - 16,000 s. It can be adjusted arbitrarily within the spectrum area of the test frequency band, and the disturbance amplitudes and quasi-peak values of the required frequency points and frequency bands can be set and read from the overall frequency band disturbance map. The background mainly serves for measurement control, image display, data processing, and data storage. Specifically, the spectrum test data is synchronously and visually displayed in the visible light coordinate system, and the emission disturbance level intensity is displayed with color-level bars. Before each test, the visible light background position is calibrated using the stereo camera, reflection marker balls, and measurement switch. The initial calibration is performed by the binocular cameras of the stereo camera for overall shooting, and then two points on the diagonal of the test surface of the test sample are selected using the reflection marker balls to establish a spatial plane. During the establishment process, the stereo camera uses the laser positioning function to track, reads the real-time position of the movement of the reflection marker balls, and directly displays the spatial coordinate values on the background. The reflection marker balls are combined and connected with the antenna probe, and are held and moved by the tester. The antenna probe transmits in the form of an electrical signal to the spectrum analyzer to measure the emission disturbance value. The background uses the visible light photo of the test surface of the test sample as the background, and flexibly displays in different colors according to the strength of the emission disturbance value.

[0057] The basic principles of the present application have been described above in combination with specific embodiments. However, it should be noted that the advantages, advantages, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, advantages, effects, etc. are essential for each embodiment of the present application. In addition, the above-disclosed specific details are only for the purposes of illustration and easy understanding, rather than limitations. The above details do not limit the present application to necessarily adopt the above specific details for implementation.

[0058] The above description has been given for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions, and sub-combinations thereof.

Claims

1. A visual radiated disturbance value scanning test system for high-power electrical equipment, characterized in that: include: Stereo camera, receiving device and host computer; among them, A stereo camera, including a built-in binocular camera and a laser tracking and positioning module; used to take a picture of the tested power equipment as a whole through binocular camera, use the captured image as a visible light background image, and divide the visible light background image into grid areas with adjustable sizes; the laser tracking and positioning module determines the three-dimensional coordinate position of the reflective marker ball on the visible light background image by tracking and positioning the coordinate sensor of the reflective marker ball; The receiving device includes an antenna probe and a spectrum analyzer; the radiated disturbance measurement signal of the tested power equipment is collected through a wireless probe connected to the reflective marker ball, and the radiated disturbance measurement signal is transmitted to the spectrum analyzer; the spectrum analyzer generates the disturbance amplitude and quasi-peak value in the spectrum area of ​​the test frequency band; The host computer is connected to the stereo camera and the spectrum analyzer, and displays the disturbance amplitude and quasi-peak value with the visible light background image as the background.

2. The system according to claim 1, characterized in that Before the laser tracking and positioning module tracks and positions the coordinate sensor of the reflective marker ball, the step further includes: moving the reflective marker ball to scan the surface of the tested electrical equipment in real time.

3. The system according to claim 1, characterized in that The receiving device also includes: a differential amplifier, which is connected to the wireless probe and is used to suppress common-mode interference and noise and provide a processing signal for the spectrum analyzer.

4. The system according to claim 1 or 3, characterized in that: The spectrum analyzer is connected to the differential amplifier and generates a disturbance amplitude and a quasi-peak value in a test frequency band spectrum region based on the processed signal.

5. The system according to claim 1, characterized in that The host computer also includes: a measuring switch for calibrating the initial position of the reflective marker ball.

6. The system according to claim 1, characterized in that The grid side length range of the grid area is set to 1-1000mm, and the upper and lower limits of the depth are set to -1000-1000mm.

7. The system according to claim 1, characterized in that The wireless probe is connected to the spectrum analyzer via a coaxial cable to transmit a radiated disturbance measurement signal.

8. The system according to claim 1, characterized in that The frequency band of the spectrum analyzer is 30MHz-1GHz, and the scanning time is 1ms-16000s.

9. The system according to claim 1, characterized in that The host computer performs measurement, data processing and data storage by controlling the stereo camera and the spectrum analyzer.

10. The system according to claim 1, characterized in that The host computer synchronously visualizes the radiation disturbance measurement signal in the visible light coordinate system and displays the disturbance amplitude with color grade bars.

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