Automatic calibration device and calibration method for electromagnetic compatibility radiation immunity test

Abstract

The invention belongs to the technical field of electromagnetic compatibility testing, and discloses an automatic calibration device and method for an electromagnetic compatibility radiation immunity test, and the device comprises a horizontal driving module and a vertical driving module, the vertical driving module is installed on the horizontal driving module, and the vertical driving module is installed on the vertical driving module. A clamping device on the vertical driving module can fixedly install a field intensity probe, the horizontal driving module and the vertical driving module are controlled through the control module, by means of the device and the method, 16 calibration points needing to be measured during field intensity calibration can be conveniently and rapidly measured, data are stored, the calibration points are accurately positioned in the measurement process, and the measurement accuracy is improved. The operation difficulty of detection personnel is simplified, the energy required by the detection personnel in the detection process is reduced, and the measurement is more accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic compatibility testing, and in particular relates to an automatic calibration device and a calibration method for an electromagnetic compatibility radiation immunity test. Background Art

[0002] With the development of science and technology, electronic technology has gradually developed towards high frequency, high speed, high precision, high reliability, high sensitivity, high integration and other aspects. The electromagnetic compatibility of electrical and electronic equipment has become increasingly prominent and has been highly valued by governments of various countries. More and more electromagnetic compatibility directives, specifications and standards have been gradually introduced and required to be enforced. Electromagnetic compatibility refers to the ability of a device or system to operate in accordance with the requirements in its electromagnetic environment and not to produce intolerable electromagnetic interference to any device in its environment. Therefore, electromagnetic compatibility includes two requirements: on the one hand, it means that the electromagnetic interference generated by the device to the environment in which it is located during normal operation cannot exceed a certain limit; on the other hand, it means that the device has a certain degree of immunity to the electromagnetic interference in the environment in which it is located, that is, electromagnetic sensitivity.

[0003] In electromagnetic compatibility testing, the immunity test is used to verify whether medical electrical equipment or systems have sufficient immunity to electromagnetic disturbances to provide basic safety and basic performance. One of the immunity tests is the radio frequency electromagnetic field radiation immunity test.

[0004] One of the equipment required for this test is an anechoic chamber. The anechoic chamber should be of suitable size to maintain a uniform field area (UFA) with sufficient space relative to the equipment under test (EUT). The uniform field area is an imaginary vertical plane where the field level is set, and the change of field strength in this plane is small enough.

[0005] The standard GB 17626.3-2023 states that when setting the level, it is very important to record the position of the test equipment (such as antennas, absorbers, cables, etc.), especially at high frequencies, because even small displacements can significantly affect the electromagnetic field.

[0006] The level setting of the entire area used for the test should be carried out once a year. When the indoor layout changes (replacement of absorbing materials, relocation of the test area, change of equipment, etc.), the level setting should also be re-performed.

[0007] The preferred size of the UFA is 1.5m*1.5m. When setting the level, the UFA is divided into a series of small grids with a spacing of 0.5m. 16 standard points are required for measurement.

[0008] The common method now is to manually calibrate the distance between the antenna and UFA, and calibrate the positions of 16 calibration points one by one. After the software in the control room measures a point, it saves the relevant data, and the test personnel return to the darkroom to readjust the next measurement point. The whole process is slow, and when UFA calibration is performed in multiple darkrooms, it requires the cooperation of multiple people, which takes up more energy of the test personnel, and the manual calibration of the measurement points has poor accuracy. Summary of the invention

[0009] In order to solve the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an automatic calibration device and calibration method for electromagnetic compatibility radiation immunity test to solve the problems mentioned in the background technology.

[0010] The technical solution adopted by the present invention to solve the technical problem is: Provided is an automatic calibration device for electromagnetic compatibility radiation immunity test, comprising a horizontal drive module and a vertical drive module, wherein the vertical drive module is mounted on the horizontal drive module, a field strength probe is fixedly mounted on the vertical drive module, the horizontal drive module comprises a shielding shell, a horizontal guide rail is fixedly mounted in the shielding shell, a first belt and a first driven wheel for guiding the first belt are arranged on one side of the horizontal guide rail, the first driven wheel is rotatably mounted in the shielding shell, a first drive motor is fixedly mounted in the shielding shell, a first driving wheel for driving the first belt to move is fixedly mounted at the output end of the first drive motor, and a first driving wheel for driving the first belt to move is matched on the horizontal guide rail. A horizontal slider is installed, which is fixedly connected to the first belt. A vertical drive module is fixedly installed on the horizontal slider. The vertical drive module includes a base fixedly installed on the horizontal slider. A through groove is provided on the top of the shielding shell. The base is located in the through groove. A second belt and a second driven wheel for guiding the second belt are provided on the base. The second driven wheel is rotatably installed on the base. A second drive motor fixedly installed on the base is provided in the shielding shell. A second driving wheel for driving the second belt to move is fixedly installed on the output end of the second drive motor. A clamping device is fixedly installed on the second belt, and the field strength probe is clamped on the clamping device.

[0011] Furthermore, the clamping device is a three-jaw chuck.

[0012] Furthermore, the horizontal driving module and the vertical driving module are controlled by a control module.

[0013] Furthermore, a first laser ranging sensor is fixedly installed on one side of the shielding shell, a second laser ranging sensor is fixedly installed on the top of the base, and the outside of the second laser ranging sensor is wrapped with absorbing material.

[0014] Furthermore, the control module includes a control box, a power supply and a display screen, and the control box is connected to the first drive motor, the second drive motor, the first laser ranging sensor and the second laser ranging sensor through optical fibers.

[0015] In addition, a calibration method for electromagnetic compatibility radiation immunity test is provided, which is characterized by comprising: ①. Connect the control box to the power supply and call the set program for electromagnetic radiation immunity uniform field calibration through the display screen; ②. The first laser distance sensor measures the distance to the base, and the second laser distance sensor measures the distance to the clamping device. The measurement results are transmitted to the control module; ③. Clamp the field strength probe on the clamping device; ④. Set the horizontal center position of the shielding shell as the mark point X. Point X is aligned with the center point of the darkroom turntable along the direction of the field transmitting antenna. The vertical distance between the second laser distance sensor and the mark point X is ym, the vertical distance between the second laser distance sensor and the clamping device is y1m, and the distance between the clamping device and the field intensity probe is y2m. The distance between the calibration point and the marking point in the horizontal direction X is measured by the first laser distance sensor measuring the distance between it and the base. Set the coordinate of the marker point X to (0,0), the coordinates of the calibration points A1, A2, A3, and A4 to (-0.75, y-y1-y2), (-0.25, y-y1-y2), (0.25, y-y1-y2), (0.75, y-y1-y2), and the unit is m. The coordinates of calibration points A5, A6, A7, and A8 change compared to A1, A2, A3, and A4. They move 0.5 m in the vertical direction toward the second laser rangefinder. Their coordinates are (-0.75, y-y1-y2+0.5), (-0.25, y-y1-y2+0.5), (0.25, y-y1-y2+0.5), and (0.75, y-y1-y2+0.5). The unit is m. The coordinates of calibration points A9, A10, A11, and A12 change compared to A1, A2, A3, and A4. They move 1m in the vertical direction toward the second laser rangefinder. The coordinates are (-0.75, y-y1-y2+1), (-0.25, y-y1-y2+1), (0.25, y-y1-y2+1), and (0.75, y-y1-y2+1). The unit is m. The coordinates of calibration points A13, A14, A15, and A16 change compared to A1, A2, A3, and A4. They move 1.5 m in the vertical direction toward the second laser rangefinder. The coordinates are (-0.75, y-y1-y2+1.5), (-0.25, y-y1-y2+1.5), (0.25, y-y1-y2+1.5), and (0.75, y-y1-y2+1.5), respectively, in meters. Set one of the calibration points as the initial calibration point.

[0016] ⑤. The control box plans the moving path of the field strength probe according to the position of the initial calibration point, and controls the first drive motor and the second drive motor to work, moves the clamping device and the field strength probe to the initial calibration point, and moves the field strength probe to each calibration point in turn for measurement, and saves and marks each calibration point, and records the data accordingly, so as to facilitate viewing the test data of each calibration point; ⑥ Based on the saved relevant data, calibrate the field strength of the entire experimental area.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. An automatic calibration device for an electromagnetic compatibility radiation immunity test according to an example of the present invention, when in use, can drive the vertical drive module to move by driving the first belt by controlling the operation of the first drive motor, so as to facilitate position adjustment of the vertical drive module, and can drive the clamping device to move by driving the second belt by controlling the operation of the second drive motor, so as to facilitate position adjustment of the field strength probe fixed on the clamping device.

[0018] 2. An automatic calibration device for electromagnetic compatibility radiation immunity test in the present invention can universally clamp field strength probes of different manufacturers, brands and models by means of a three-jaw chuck.

[0019] 3. An automatic calibration device for electromagnetic compatibility radiation immunity test according to an example of the present invention can conveniently drive the field intensity probe to measure each calibration point by controlling the horizontal drive module and the vertical drive module through the control module. 4. An automatic calibration device for an electromagnetic compatibility radiation immunity test is exemplified in the present invention. The first laser ranging sensor is used to measure the distance to the base, and the second laser ranging sensor is used to measure the distance to the clamping device. The first laser ranging sensor and the second laser ranging sensor can conveniently locate the position of the field intensity probe.

[0020] 5. An automatic calibration device for electromagnetic compatibility radiation immunity test according to an example of the present invention, wherein a control box, a power supply and a display screen are arranged in a control room, can conveniently view and control the device.

[0021] 6. A calibration method for an automatic calibration device for an electromagnetic compatibility radiation immunity test is exemplified in the present invention. This method can conveniently and quickly measure and save data on 16 calibration points required for level setting by automatically calibrating measurement calibration points and planning the moving path of the field strength probe. During the measurement process, the calibration points are accurately positioned, which simplifies the operating difficulty of the detection personnel, reduces the energy required by the detection personnel during the detection process, and makes the measurement more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading and referring to the following drawings Other features, purposes and advantages of the present application will become more apparent from the detailed description of the non-limiting embodiments: Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is the size of the 16-point uniform field of the present invention; Figure 3 It is a schematic diagram of the level setting arrangement of the present invention.

[0023] In the figure: 1. shielding shell; 2. horizontal guide rail; 3. first belt; 4. first driven wheel; 5. first drive motor; 6. first driving wheel; 7. horizontal slider; 8. base; 9. second belt; 10. second driven wheel; 11. second drive motor; 12. second driving wheel; 13. clamping device; 14. field intensity probe; 15. first laser ranging sensor; 16. second laser ranging sensor. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] Embodiment 1: like Figure 1As shown, this embodiment provides an automatic calibration device for an electromagnetic compatibility radiation immunity test, including a horizontal drive module and a vertical drive module, the vertical drive module is installed on the horizontal drive module, a field strength probe 14 is fixedly installed on the vertical drive module, the horizontal drive module, the vertical drive module and the field strength probe 14 are all located in an anechoic chamber, the horizontal drive module includes a shielding shell 1, the shielding shell 1 is installed in the anechoic chamber and the top surface of the shielding shell 1 is located at the same horizontal plane as the floor of the anechoic chamber, a horizontal guide rail 2 is fixedly installed in the shielding shell 1, a first belt 3 and a first driven wheel 4 for guiding the first belt 3 are provided on one side of the horizontal guide rail 2, the first driven wheel 4 is rotatably installed in the shielding shell 1, a first drive motor 5 is fixedly installed in the shielding shell 1, and a first main drive motor 5 for driving the first belt 3 to move is fixedly installed at the output end of the first drive motor 5 A driven wheel 6, a horizontal slider 7 is installed on the horizontal guide rail 2, the horizontal slider 7 is fixedly connected to the first belt 3, and a vertical drive module is fixedly installed on the horizontal slider 7. The vertical drive module includes a base 8 fixedly installed on the horizontal slider 7. A through groove is opened on the top of the shielding shell 1, and the base 8 is located in the through groove. A second belt 9 and a second driven wheel 10 for guiding the second belt 9 are provided on the base 8. The second driven wheel 10 is rotatably installed on the base 8. A second drive motor 11 fixedly installed on the base 8 is provided in the shielding shell 1. The output end of the second drive motor 11 is fixedly installed with a second driving wheel 12 for driving the second belt 9 to move. A clamping device 13 is fixedly installed on the second belt 9, and a field strength probe 14 is clamped on the clamping device 13. The base 8, the second belt 9, the second driven wheel 10 and the clamping device 13 are all non-metallic parts.

[0027] In this embodiment, the clamping device 13 is a three-jaw chuck. The three-jaw chuck can be used to clamp field strength probes of different manufacturers, brands and models.

[0028] In this embodiment, the horizontal driving module and the vertical driving module are controlled by a control module, and the control module is arranged in a control room.

[0029] In this embodiment, a first laser ranging sensor 15 is fixedly installed on one side of the shielding shell 1, and a second laser ranging sensor 16 is fixedly installed on the top of the base 8. The second laser ranging sensor 16 is wrapped with absorbing material on the outside.

[0030] In this embodiment, the control module includes a control box, a power supply and a display screen. The control box is connected to the first drive motor 5, the second drive motor 11, the first laser ranging sensor 15 and the second laser ranging sensor 16 through optical fibers.

[0031] When the device is in use, the shielding shell 1 is installed in the anechoic chamber and the top surface of the shielding shell 1 is located at the same level as the floor of the anechoic chamber, and is connected to the shielding chamber grounding system with low impedance to avoid interference with the test results. The first drive motor 5 and the second drive motor 11 are controlled by the control module to work, and the movement of the field intensity probe 14 can be conveniently controlled. After the field intensity probe 14 is positioned according to the first laser ranging sensor 15 and the second laser ranging sensor 16, the control box is used to plan the detection calibration points and the moving path of the field intensity probe 14, and UFA calibration can be conveniently and quickly performed. It is convenient and quick to use, reduces the energy required by the detection personnel during the detection process, and the measurement is more accurate. Through the device, while meeting the electromagnetic compatibility site requirements and test environment, it can realize fully automated calibration and meet high-standard precision control, and can also achieve compatibility with existing commercial test software to achieve fully automated testing of UFA calibration.

[0032] Embodiment 2: This example also provides a calibration method for electromagnetic compatibility radiation immunity test, including: ①. Connect the control box to the power supply and call the set program for electromagnetic radiation immunity uniform field calibration through the display screen; ②, the first laser distance sensor 15 measures the distance to the base 8, and the second laser distance sensor 16 measures the distance to the clamping device 13, and the measurement results are transmitted to the control module; ③. Clamp the field intensity probe 14 on the clamping device 13; ④. Set the horizontal center position of the shielding shell as the mark point X. Point X is aligned with the center point of the darkroom turntable along the direction of the field transmitting antenna. The vertical distance between the second laser distance sensor and the mark point X is ym, the vertical distance between the second laser distance sensor and the clamping device is y1m, and the distance between the clamping device and the field intensity probe is y2m. The distance between the calibration point and the marking point X in the horizontal direction is measured by the first laser distance measuring sensor 15 measuring the distance between the first laser distance measuring sensor 15 and the base 8; Set the coordinate of the marker point X to (0,0), and the coordinates of the calibration points A1, A2, A3, and A4 to (-0.75, y-y1-y2), (-0.25, y-y1-y2), (0.25, y-y1-y2), (0.75, y-y1-y2), in meters. The coordinates of calibration points A5, A6, A7, and A8 change compared to A1, A2, A3, and A4. They move 0.5 m in the vertical direction toward the second laser rangefinder 16. The coordinates are (-0.75, y-y1-y2+0.5), (-0.25, y-y1-y2+0.5), (0.25, y-y1-y2+0.5), and (0.75, y-y1-y2+0.5), respectively, in meters. The coordinates of calibration points A9, A10, A11, and A12 change compared to A1, A2, A3, and A4. They move 1 m in the vertical direction toward the second laser rangefinder 16. The coordinates are (-0.75, y-y1-y2+1), (-0.25, y-y1-y2+1), (0.25, y-y1-y2+1), and (0.75, y-y1-y2+1), respectively, in meters. The coordinates of calibration points A13, A14, A15, and A16 change compared to A1, A2, A3, and A4. They move 1.5 m in the vertical direction toward the second laser rangefinder 16. The coordinates are (-0.75, y-y1-y2+1.5), (-0.25, y-y1-y2+1.5), (0.25, y-y1-y2+1.5), and (0.75, y-y1-y2+1.5), respectively, in meters. Set one of the calibration points as the initial calibration point.

[0033] ⑤. The control box plans the moving path of the field strength probe 14 according to the position of the initial calibration point, and controls the first drive motor 5 and the second drive motor 11 to work, moves the clamping device 13 and the field strength probe 14 to the initial calibration point, and moves the field strength probe 14 to each calibration point in turn for measurement, and saves and marks each calibration point, and records the data accordingly, so as to facilitate viewing the test data of each calibration point; ⑥ Based on the saved relevant data, calibrate the field strength of the entire experimental area.

[0034] Normally, the distance between the field strength probe and the ground is set to ≤0.5m.

[0035] The method can conveniently and quickly measure and save data on 16 calibration points required for level setting by automatically calibrating measurement calibration points and planning the moving path of the field strength probe 14. The calibration points are accurately positioned during the measurement process, which simplifies the operating difficulty of the detection personnel and reduces the energy required by the detection personnel during the detection process. During the test, unnecessary personnel are kept away from the darkroom to avoid the influence of human body reflection on the radiation field, thereby ensuring the accuracy of the test results and making the measurement more accurate.

[0036] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

[0037] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.

Claims

1. An automatic calibration device for electromagnetic compatibility radiation immunity test, comprising a horizontal drive module and a vertical drive module, characterized in that: The vertical drive module is mounted on the horizontal drive module, and the horizontal drive module comprises a shielding shell (1), a horizontal guide rail (2) is fixedly mounted in the shielding shell (1), a first belt (3) and a first driven wheel (4) for guiding the first belt (3) are provided on one side of the horizontal guide rail (2), the first driven wheel (4) is rotatably mounted in the shielding shell (1), a first drive motor (5) is fixedly mounted in the shielding shell (1), a first driving wheel (6) for driving the first belt (3) to move is fixedly mounted at the output end of the first drive motor (5), a horizontal slider (7) is matched and mounted on the horizontal guide rail (2), and the horizontal slider (7) is fixedly connected to the first belt (3). The vertical drive module The block is fixedly mounted on the horizontal slider (7), the vertical drive module comprises a base (8) fixedly mounted on the horizontal slider (7), a through groove is provided on the top of the shielding shell (1), the base (8) is located in the through groove, a second belt (9) and a second driven wheel (10) for guiding the second belt (9) are provided on the base (8), the second driven wheel (10) is rotatably mounted on the base (8), a second drive motor (11) fixedly mounted on the base (8) is provided in the shielding shell (1), a second driving wheel (12) for driving the second belt (9) to move is fixedly mounted on the output end of the second drive motor (11), and a clamping device (13) is fixedly mounted on the second belt (9).

2. The automatic calibration device for electromagnetic compatibility radiation immunity test according to claim 1 is characterized in that: The clamping device (13) is a three-jaw chuck.

3. The automatic calibration device for electromagnetic compatibility radiation immunity test according to claim 1 is characterized in that: The horizontal driving module and the vertical driving module are controlled by the control module.

4. The automatic calibration device for electromagnetic compatibility radiation immunity test according to claim 1 is characterized in that: A first laser distance measuring sensor (15) is fixedly mounted on one side of the shielding shell (1), a second laser distance measuring sensor (16) is fixedly mounted on the top of the base (8), and the exterior of the second laser distance measuring sensor (16) is wrapped with wave absorbing material.

5. The automatic calibration device for electromagnetic compatibility radiation immunity test according to claim 4 is characterized in that: The control module comprises a control box, a power supply and a display screen, and the control box is connected to the first drive motor (5), the second drive motor (11), the first laser distance measuring sensor (15) and the second laser distance measuring sensor (16) via optical fibers.

6. A calibration method for an automatic calibration device for electromagnetic compatibility radiation immunity test according to any one of claims 1 to 5, characterized in that: include: ①. Connect the control box to the power supply and call the set program for electromagnetic radiation immunity uniform field calibration through the display screen; ②, the first laser distance measuring sensor (15) measures the distance between the first laser distance measuring sensor (15) and the base (8), and the second laser distance measuring sensor (16) measures the distance between the first laser distance measuring sensor (15) and the clamping device (13), and both measurement results are transmitted to the control module; ③. Clamping the field intensity probe (14) on the clamping device (13); ④. Set the horizontal center position of the shielding shell (1) as the mark point X. Point X is aligned with the center point of the darkroom turntable along the direction of the field transmitting antenna. The length of the second laser distance measuring sensor (16) from the marking point X in the vertical direction is ym, the distance of the second laser distance measuring sensor (16) from the clamping device in the vertical direction is y1m, and the distance of the clamping device from the field intensity probe is y2m. The distance between the calibration point and the marking point in the horizontal direction X is measured by the first laser distance measuring sensor (15) measuring the distance between the first laser distance measuring sensor (15) and the base (8). Set the coordinate of the marker point X to (0,0), the coordinates of the calibration points A1, A2, A3, and A4 to (-0.75, y-y1-y2), (-0.25, y-y1-y2), (0.25, y-y1-y2), (0.75, y-y1-y2), and the unit is m. The coordinates of calibration points A5, A6, A7, and A8 change compared to A1, A2, A3, and A4. They move 0.5 m in the vertical direction toward the second laser rangefinder (16). The coordinates are (-0.75, y-y1-y2+0.5), (-0.25, y-y1-y2+0.5), (0.25, y-y1-y2+0.5), and (0.75, y-y1-y2+0.5), respectively, in meters. The coordinates of calibration points A9, A10, A11, and A12 change compared to A1, A2, A3, and A4. They move 1 m in the vertical direction toward the second laser rangefinder (16). The coordinates are (-0.75, y-y1-y2+1), (-0.25, y-y1-y2+1), (0.25, y-y1-y2+1), and (0.75, y-y1-y2+1). The unit is m. The coordinates of calibration points A13, A14, A15, and A16 change compared to A1, A2, A3, and A4. They move 1.5 m in the vertical direction toward the second laser rangefinder (16). The coordinates are (-0.75, y-y1-y2+1.5), (-0.25, y-y1-y2+1.5), (0.25, y-y1-y2+1.5), and (0.75, y-y1-y2+1.5), respectively, in meters. Set one of the calibration points as the initial calibration point; 5. The control box plans the moving path of the field strength probe (14) according to the position of the initial calibration point, and controls the first drive motor (5) and the second drive motor (11) to work, so as to move the clamping device (13) and the field strength probe (14) to the initial calibration point, so that the field strength probe (14) moves to each calibration point in turn for measurement, and saves and marks each calibration point, and records the corresponding data, so as to facilitate viewing of the test data of each calibration point; ⑥ Based on the saved relevant data, calibrate the field strength of the entire experimental area.

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