Electromagnetic compatibility radiation emission field test method and system for irregular-shape equipment
By performing three-dimensional scanning and antenna detection methods on irregular-shaped devices, the problem of lack of automatic positioning devices and methods in the prior art is solved, and the convenience and accuracy of electromagnetically compatible radiation emission field testing is achieved.
Patent Information
- Application Number
- CN202510135755.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-07
- Publication Date
- 2025-05-06
AI Technical Summary
The prior art lacks automatic positioning devices and methods, making it difficult to achieve convenience and accuracy of electromagnetically compatible radiation emission field testing of equipment with irregular shapes.
A field test method for electromagnetically compatible radiation emission of equipment is adopted for irregular shapes. A three-dimensional model is established by scanning equipment, an antenna is arranged for electromagnetically compatible radiation detection, and multiple sets of electromagnetically compatible radiation data are obtained through the rotation and movement of the antenna, and normalized processing is carried out to judge the effectiveness of the data.
It has achieved standardization of the test process, improved testing efficiency and improved testing accuracy, and has the advantages of ease of on-site operation.
Smart Images
Figure CN119936532A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of radiation testing technology, and in particular to a method and system for on-site testing of electromagnetic compatibility radiation emissions of irregularly shaped equipment. Background Art
[0002] At present, there is still a lack of automatic positioning devices and methods for electromagnetic compatibility radiation emission testing of irregularly shaped devices. Existing radiation emission tests are mostly carried out in darkrooms, but when the device is large, it is necessary to test it on site. In field testing, in order to obtain accurate emission values, it is necessary to scan around the sample, but this process lacks a convenient and standardized method. Summary of the invention
[0003] In order to help solve the above-mentioned technical problems, the present application provides a method and system for on-site testing of electromagnetic compatibility radiation emissions of irregularly shaped equipment.
[0004] In a first aspect, the present application provides a method for on-site testing of electromagnetic compatibility radiation emission of irregularly shaped equipment, which adopts the following technical solution: A method for on-site testing of electromagnetic compatibility radiation emission of irregularly shaped equipment, wherein the method comprises: Step S1: Scan the irregularly shaped device and establish a three-dimensional model of the irregularly shaped device, and establish a spatial rectangular coordinate system with the center of the three-dimensional model as the origin and a straight line perpendicular to the bottom surface of the three-dimensional model as the z-axis; Step S2: Arrange an antenna around the irregularly shaped device, the antenna is parallel to the xy coordinate system, and the straight line where the antenna is located is perpendicular to the z-axis, and record the position of the antenna in the spatial rectangular coordinate system as the first position; Step S3: Detect electromagnetic compatibility radiation emitted by irregularly shaped devices through an antenna, and then the antenna moves clockwise or counterclockwise with the intersection of the straight line and the z-axis as the center and the plane parallel to the xy coordinate system as the disk. During the movement, the antenna moves from the first position, the second position to the Nth position in sequence until the antenna returns to the first position, and N groups of electromagnetic compatibility radiation data are obtained, where N is an integer greater than or equal to 2, and the angle between the line segment of the antenna extended to the z-axis at the Nth position and the line segment of the antenna extended to the z-axis at the N-1th position is a preset angle; Step S4: The distance between the antenna and the z-axis is the actual measurement distance. All electromagnetic compatibility radiation data detected at the actual measurement distance are normalized to the electromagnetic compatibility radiation data corresponding to the standard measurement distance, and it is determined whether the maximum and minimum values of the N groups of electromagnetic compatibility radiation data are within a preset range.
[0005] Preferably, step S3 includes: When the electromagnetic compatibility radiation frequency detected by the antenna at the first position is in the first frequency range, the preset angle is the first preset angle; when the electromagnetic compatibility radiation frequency detected by the antenna at the first position is in the second frequency range, the preset angle is the second preset angle.
[0006] Preferably, the first frequency interval is [30 MHz, 1 GHz], the second frequency interval is (1 GHz, +∞), the first preset angle is 22.5 degrees, and the second preset angle is 15 degrees.
[0007] Preferably, step S3 includes: At the Nth position, the antenna moves along the z-axis direction with a preset step size and a preset interval.
[0008] Preferably, the preset step size is 0.5 m, and the preset interval is [1 m, 4 m].
[0009] Preferably, step S4 comprises: Normalization is achieved in the following way: E_std=E_mea dBμV / m+20lg d_mea / d_std; where dmea is the actual measurement distance; dstd is the standard measurement distance; Emea is the electromagnetic compatibility radiation data corresponding to the actual measurement distance; Estd is the electromagnetic compatibility radiation data corresponding to the standard measurement distance, with units of m and dBμV / m.
[0010] In the second aspect, the present application provides an on-site electromagnetic compatibility radiation emission test system for irregularly shaped equipment, which adopts the following technical solution: A field test system for electromagnetic compatibility radiation emission of irregularly shaped equipment, wherein the system uses the method as described in the first aspect, the irregularly shaped equipment includes medical equipment and auxiliary equipment, and the system includes VR glasses, a 3D scanning tool, an antenna, a receiver and a computer. VR glasses and 3D scanning tools are used to scan irregularly shaped devices; The receiver is used to forward the EMC radiation sent by the antenna to the computer; The computer is used to establish a three-dimensional model, determine the frequency of electromagnetic compatibility radiation and display the electromagnetic compatibility radiation data spectrum, and is used to execute step S4.
[0011] In summary, the electromagnetic compatibility radiation emission on-site testing method of irregular-shaped equipment in the present application realizes the standardization of the testing process, the improvement of testing efficiency and the improvement of testing accuracy, and has the advantage of being easy to operate on-site. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 A schematic diagram of the principle of a field test method for electromagnetic compatibility radiation emission of irregularly shaped equipment in this application; Figure 2 for Figure 1 Top view of the illustrated embodiment. DETAILED DESCRIPTION
[0013] The present application is further described below in conjunction with the accompanying drawings, and the structure and principle of the present application are very clear to people in the field. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0014] Figure 1 This is a schematic diagram of the principle of a field test method for electromagnetic compatibility radiation emission of irregularly shaped equipment in this application. Figure 2 for Figure 1 Top view of the illustrated embodiment.
[0015] Combination Figure 1 to Figure 2 It is understood that the method of the present application may include the following steps: Step S1: Scan irregularly shaped equipment and establish a three-dimensional model of the irregularly shaped equipment, using the center of the three-dimensional model as the origin and the straight line perpendicular to the bottom surface of the three-dimensional model as the z-axis to establish a spatial rectangular coordinate system. Specifically, in step S1, three-dimensional modeling refers to converting the scanned data into a three-dimensional model through three-dimensional modeling software for subsequent analysis and processing. With the center of the three-dimensional model as the origin and the straight line perpendicular to the bottom surface of the three-dimensional model as the z-axis, a spatial rectangular coordinate system is established to facilitate accurate description of the spatial position of the equipment. Step S1 accurately obtains the three-dimensional geometric information of irregularly shaped equipment. Establishing a unified spatial rectangular coordinate system provides a basis for subsequent steps.
[0016] Step S2: Arrange an antenna around the irregularly shaped device, the antenna is parallel to the xy coordinate system, and the straight line where the antenna is located is perpendicular to the z-axis, and record the position of the antenna in the spatial rectangular coordinate system as the first position.
[0017] Specifically, in step S2, the antenna is arranged around the irregularly shaped device to ensure that the antenna can receive the electromagnetic radiation emitted by the device. The antenna is parallel to the xy coordinate system, and the straight line where the antenna is located is perpendicular to the z-axis to ensure that the antenna can receive the electromagnetic radiation of the device in the horizontal plane. Step S2 reasonably arranges the antenna to ensure that the electromagnetic radiation emitted by the device can be received.
[0018] Step S3: The electromagnetic compatibility radiation emitted by the irregularly shaped device is detected by the antenna, and then the antenna moves clockwise or counterclockwise with the intersection of the straight line and the z-axis as the center and the plane parallel to the xy coordinate system as the disk. During the movement, the antenna moves from the first position, the second position to the Nth position in sequence until the antenna returns to the first position, and N groups of electromagnetic compatibility radiation data are obtained, N is an integer greater than or equal to 2, and the angle between the line segment of the antenna extending to the z-axis at the Nth position and the line segment of the antenna extending to the z-axis at the N-1th position is the preset angle. In step S3, when the electromagnetic compatibility radiation frequency detected by the antenna at the first position is in the first frequency interval, the preset angle is the first preset angle, and when the electromagnetic compatibility radiation frequency detected by the antenna at the first position is in the second frequency interval, the preset angle is the second preset angle. In this embodiment, the first frequency interval can be [30MHz, 1GHz], the second frequency interval can be (1GHz, +∞), the first preset angle can be 22.5 degrees, and the second preset angle can be 15 degrees.
[0019] It should be noted that the antenna can also move up and down when rotating clockwise or counterclockwise along a plane parallel to the xy coordinate system. At the Nth position, the antenna moves along the z-axis direction with a preset step size and a preset interval. In this embodiment, the preset step size can be 0.5m, and the preset interval can be [1m, 4m].
[0020] In step S3, electromagnetic radiation detection refers to using an antenna to detect electromagnetic compatibility radiation emitted by irregularly shaped devices to obtain information such as the frequency and intensity of electromagnetic radiation. The antenna moves clockwise or counterclockwise in a plane parallel to the xy coordinate system with the intersection of the straight line and the z-axis as the center of the circle to simulate the electromagnetic radiation emitted by the device at different angles. The antenna moves from the first position to the Nth position in sequence until it returns to the first position, and obtains N sets of electromagnetic compatibility radiation data to comprehensively evaluate the electromagnetic compatibility of the device. When the electromagnetic compatibility radiation frequency is in [30MHz, 1GHz], the preset angle is 22.5 degrees to ensure sufficient sampling of electromagnetic radiation within this frequency range. When the electromagnetic compatibility radiation frequency is in (1GHz, +∞), the preset angle is 15 degrees. Since high-frequency electromagnetic radiation changes faster, a smaller angle is required to improve sampling accuracy.
[0021] It should be noted that the antenna cost for measuring the electromagnetic compatibility radiation of the equipment is usually high, and when multiple antennas are used at the same time, the antennas will interfere with each other, so a single antenna is selected in the method of this application. In other optional embodiments, all antennas can be directly placed after the preset angle, and a specific algorithm can be used to eliminate the influence of mutual interference between antennas on the radiation value detection result.
[0022] Step S4: The distance between the antenna and the z-axis is the actual measurement distance. All electromagnetic compatibility radiation data detected at the actual measurement distance are normalized to the electromagnetic compatibility radiation data corresponding to the standard measurement distance, and it is determined whether the maximum and minimum values of the N groups of electromagnetic compatibility radiation data are within the preset range. In step S4, normalization is achieved by: E_std=E_mea dBμV / m+20lg d_mea / d_std; where dmea is the actual measurement distance; dstd is the standard measurement distance; Emea is the electromagnetic compatibility radiation data corresponding to the actual measurement distance; Estd is the electromagnetic compatibility radiation data corresponding to the standard measurement distance, with m and dBμV / m as units. Through normalization processing, the influence of the measurement distance on the electromagnetic radiation detection intensity is eliminated to ensure that the electromagnetic radiation data at different distances are comparable.
[0023] The present application also proposes a field test system for electromagnetic compatibility radiation emission of irregularly shaped equipment, which uses the aforementioned method. The irregularly shaped equipment may include medical equipment and auxiliary equipment. The system includes VR glasses, 3D scanning tools, antennas, receivers and computers. VR glasses and 3D scanning tools are used to scan irregularly shaped equipment; the receiver is used to forward the electromagnetic compatibility radiation sent by the antenna to the computer; the computer is used to establish a three-dimensional model, determine the frequency of electromagnetic compatibility radiation and display the electromagnetic compatibility radiation data spectrum, and is used to execute step S4. The above parts involving calculation and intelligent processing are all implemented by the computer equipped with EMC32 software of the present application.
Claims
1. A method for testing electromagnetic compatibility radiation emission on-site of irregularly shaped equipment, characterized in that: The method comprises: Step S1: Scan the irregularly shaped device and establish a three-dimensional model of the irregularly shaped device, and establish a spatial rectangular coordinate system with the center of the three-dimensional model as the origin and a straight line perpendicular to the bottom surface of the three-dimensional model as the z-axis; Step S2: Arrange an antenna around the irregularly shaped device, the antenna is parallel to the xy coordinate system, and the straight line where the antenna is located is perpendicular to the z-axis, and record the position of the antenna in the spatial rectangular coordinate system as the first position; Step S3: Detect electromagnetic compatibility radiation emitted by irregularly shaped devices through an antenna, and then the antenna moves clockwise or counterclockwise with the intersection of the straight line and the z-axis as the center and the plane parallel to the xy coordinate system as the disk. During the movement, the antenna moves from the first position, the second position to the Nth position in sequence until the antenna returns to the first position, and N groups of electromagnetic compatibility radiation data are obtained, where N is an integer greater than or equal to 2, and the angle between the line segment of the antenna extended to the z-axis at the Nth position and the line segment of the antenna extended to the z-axis at the N-1th position is a preset angle; Step S4: The distance between the antenna and the z-axis is the actual measurement distance. All electromagnetic compatibility radiation data detected at the actual measurement distance are normalized to the electromagnetic compatibility radiation data corresponding to the standard measurement distance, and it is determined whether the maximum and minimum values of the N groups of electromagnetic compatibility radiation data are within a preset range.
2. The on-site testing method for electromagnetic compatibility radiation emission of irregularly shaped equipment according to claim 1 is characterized in that: The step S3 comprises: When the electromagnetic compatibility radiation frequency detected by the antenna at the first position is in the first frequency range, the preset angle is the first preset angle; when the electromagnetic compatibility radiation frequency detected by the antenna at the first position is in the second frequency range, the preset angle is the second preset angle.
3. The on-site testing method for electromagnetic compatibility radiation emission of irregular-shaped equipment according to claim 2 is characterized in that: The first frequency range is [30 MHz, 1 GHz], the second frequency range is (1 GHz, +∞), the first preset angle is 22.5 degrees, and the second preset angle is 15 degrees.
4. The on-site testing method for electromagnetic compatibility radiation emission of irregular-shaped equipment according to claim 2 is characterized in that: The step S3 comprises: At the Nth position, the antenna moves along the z-axis direction with a preset step size and a preset interval.
5. The on-site testing method for electromagnetic compatibility radiation emission of irregular-shaped equipment according to claim 4 is characterized in that: The preset step size is 0.5m, and the preset interval is [1m, 4m].
6. The on-site testing method for electromagnetic compatibility radiation emission of irregular-shaped equipment according to claim 4 is characterized in that: The step S4 comprises: The normalization is achieved in the following way: E_std=E_mea dBμV / m+20lg d_mea / d_std; wherein dmea is the actual measurement distance; dstd is the standard measurement distance; Emea is the electromagnetic compatibility radiation data corresponding to the actual measurement distance; Estd is the electromagnetic compatibility radiation data corresponding to the standard measurement distance, with m and dBμV / m as units.
7. A field test system for electromagnetic compatibility radiation emission of irregularly shaped equipment, characterized in that: The system uses the method as claimed in claim 6, the irregularly shaped device includes a medical device and an auxiliary device, and the system includes VR glasses, a 3D scanning tool, an antenna, a receiver and a computer. VR glasses and 3D scanning tools are used to scan the irregularly shaped device; The receiver is used to forward the EMC radiation sent by the antenna to the computer; The computer is used to establish the three-dimensional model, determine the frequency of the electromagnetic compatibility radiation and display the electromagnetic compatibility radiation data spectrum, and is used to execute the step S4.