Calibration device capable of resisting magnetic field radiation interference
By combining a magnetic field sensor coil and a spectrum analyzer, the problem of probe placement distance limitations was solved, enabling high-precision magnetic field radiation interference calibration, reducing costs and improving applicability.
Patent Information
- Application Number
- CN202520428464.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-12
AI Technical Summary
In existing technologies, it is difficult to place the probe within 5cm of the antenna, resulting in poor calibration results. Furthermore, different probes are required for different frequencies, increasing costs.
By replacing the probe with a magnetic field sensor coil, and using a spectrum analyzer and the magnetic field sensor coil for signal monitoring and recording, the problem of distance limitation between the magnetic field sensor coil and the loop antenna is solved, simplifying the calibration process and reducing costs.
It achieves precise calibration of field strength at different frequencies, reduces the number of magnetic field sensor coils, improves calibration accuracy and applicability, and enables real-time evaluation of the magnetic field radiation immunity of electrical and electronic products.
Smart Images
Figure CN223941095U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of signal detection technology, and in particular to a calibration device for resisting magnetic field radiation interference. Background Technology
[0002] When calibrating a nearby magnetic field, a probe is typically used to detect the signal emitted by the antenna. In this method, the probe usually needs to be placed 5cm away from the antenna to ensure the accuracy of the detection data. Therefore, when the diameter of the probe is larger than the diameter of the antenna, it is difficult to place the probe 5cm away from the antenna, resulting in poor calibration results. At the same time, the frequency used by the probe is limited, which means that different probes are needed to detect the field strength at different frequencies, thus increasing costs. Utility Model Content
[0003] To overcome the aforementioned shortcomings, the purpose of this invention is to provide a magnetic field radiation interference immunity calibration device. This device solves the problem of distance limitations between the magnetic field sensor coil and the loop antenna by using a magnetic field sensor coil instead of a traditional probe to receive signals. When calibrating field strength at different frequencies, there is no need to replace the magnetic field sensor coil, thereby reducing the number of magnetic field sensor coils, lowering costs, and simplifying the calibration process. Simultaneously, the size of the magnetic field sensor coil is no longer limited. Furthermore, by utilizing a spectrum analyzer, the test frequency can meet the requirements of nearby magnetic field radiation immunity testing, resulting in high accuracy of the calibrated field strength and improving the applicability of the device. The spectrum analyzer and magnetic field sensor coil can also monitor and record calibration values in real time to accurately assess the nearby magnetic field radiation immunity of electrical and electronic products or systems.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is: an anti-magnetic field radiation interference calibration device, comprising: a loop antenna, a signal generator, a low-frequency power amplifier, a spectrum analyzer, and a magnetic field sensor coil. The magnetic field sensor coil is disposed on the loop antenna, the loop antenna is connected to the low-frequency power amplifier, the low-frequency power amplifier is connected to the signal generator, and the magnetic field sensor coil is connected to the spectrum analyzer.
[0005] In this technical solution, a signal generator is used to generate interference signals, a loop antenna is used to transmit the interference signals generated by the signal generator, a low-frequency power amplifier is used to amplify the signals according to the set power to meet the field strength requirements, and a spectrum analyzer and magnetic field sensor coil are used to monitor the magnetic field strength. By using a magnetic field sensor coil to receive signals instead of the original probe, the problem of distance limitations between the magnetic field sensor coil and the loop antenna is solved. When calibrating the field strength at different frequencies, there is no need to replace the magnetic field sensor coil, thus reducing the need to prepare too many magnetic field sensor coils, thereby reducing costs and simplifying the calibration process. At the same time, the size of the magnetic field sensor coil is not limited. By using a spectrum analyzer, the test frequency can meet the frequency requirements of the nearby magnetic field radiation immunity test, and the accuracy of the calibrated field strength is high, thereby improving the applicability of the magnetic field radiation immunity calibration device. At the same time, the spectrum analyzer and magnetic field sensor coil effectively monitor and record calibration values in real time, so as to truly evaluate the nearby magnetic field radiation immunity of electrical and electronic products or systems.
[0006] In some implementations, the loop antenna includes a matching network and a resonant circuit.
[0007] In this technical solution, a matching network and a resonant circuit are used to transmit signals.
[0008] In some implementations, the resistance of the matching network is 50 ohms.
[0009] In this technical solution, a loop antenna with a 50-ohm matching network is used for signal transmission.
[0010] In some embodiments, the frequency range of the spectrum analyzer is from 10 Hz to 40 GHz.
[0011] In this technical solution, the frequency range of 10Hz to 40GHz is used to cover all the frequencies required for testing.
[0012] In some embodiments, the spectrum analyzer used is a Keysight N9010B.
[0013] In this technical solution, the magnetic field strength is detected using a Keysight N9010B spectrum analyzer.
[0014] In some implementations, the loop antenna is model FESP 5132.
[0015] In this technical solution, a loop antenna of model FESP 5132 is used for signal transmission.
[0016] In some embodiments, the model of the loop antenna also includes HFRA 5164.
[0017] This technical solution utilizes an HFRA 5164 loop antenna for signal transmission.
[0018] In some embodiments, the magnetic field sensor coil is model FESP 5134-40.
[0019] In this technical solution, the FESP 5134-40 magnetic field sensor coil is used to monitor the signal transmitted by the loop antenna.
[0020] In some embodiments, the magnetic field sensor coil also includes the model number ESP 5134-1.
[0021] In this technical solution, the magnetic field sensor coil of model ESP 5134-1 is used to monitor the signal transmitted by the loop antenna.
[0022] The beneficial effects of this invention are as follows: by using a magnetic field sensor coil to receive signals instead of the original probe, the problem of the distance between the magnetic field sensor coil and the loop antenna needs to be limited. When calibrating the field strength at different frequencies, there is no need to replace the magnetic field sensor coil, thus reducing the need to prepare too many magnetic field sensor coils, thereby reducing costs and simplifying the calibration steps. At the same time, the size of the magnetic field sensor coil is not limited. By using a spectrum analyzer, the test frequency can meet the frequency requirements of the nearby magnetic field radiation anti-interference test, and the accuracy of the calibrated field strength is high, thereby improving the applicability of the anti-magnetic field radiation interference calibration device. At the same time, the spectrum analyzer and the magnetic field sensor coil effectively monitor and record the calibration values in real time, so as to truly evaluate the nearby magnetic field radiation anti-interference capability of electrical and electronic products or systems. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the anti-magnetic field radiation interference calibration device according to an embodiment of the present invention;
[0024] In the diagram: 1. Loop antenna; 2. Spectrum analyzer; 3. Low-frequency power amplifier; 4. Signal generator. Detailed Implementation
[0025] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.
[0026] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0027] Combined with appendix Figure 1 This invention provides a calibration device for resisting magnetic field radiation interference, comprising: a loop antenna 1, a signal generator 4, a low-frequency power amplifier 3, a spectrum analyzer 2, and a magnetic field sensor coil. The magnetic field sensor coil is mounted on the loop antenna 1, located at the center of the loop antenna 1, at a distance of 50mm from the loop antenna 1. The magnetic field sensor coil is connected to the spectrum analyzer 2, the loop antenna 1 is connected to the low-frequency power amplifier 3, and the low-frequency power amplifier 3 is connected to the signal generator 4. The signal generator 4 is used to generate interference signals, typically carrier or pulse-modulated signals. The signal generator 4 is a vector signal generator with an output frequency range of 9kHz-30MHz, the specific output frequency of which can be defined by the operator. The loop antenna 1 is used to transmit the interference signals generated by the signal generator 4. The low-frequency power amplifier 3 is used to amplify the signal according to the set power; the amplification factor can be adjusted as needed to meet the field strength requirements. The spectrum analyzer 2 and the magnetic field sensor coil are used to monitor the magnetic field strength. The spectrum analyzer 2 acquires the signal collected by the magnetic field sensor coil and, according to a formula, converts the level value or field strength to obtain the field strength of the current interference signal.
[0028] The conversion formula for converting the level value to the corresponding field strength is: x = 20 × log10(y × 10^6) - c, where x is the reading on the spectrum analyzer, i.e. the level value, y is the field strength, and c is the factor of the magnetic field sensor coil.
[0029] For example, if the field strength is 8 A / m and the factor of the magnetic field sensor coil is 42.27, the reading of the spectrum analyzer should be calculated according to the above formula as: x = 20 × log10(8 × 10^6) - c, that is, x = 95.73 dBuv. Similarly, the current field strength can also be calculated according to the formula based on the level value of the spectrum analyzer reading.
[0030] Adjust the power value of the interference signal output by signal generator 4 until the monitored field strength meets the test requirements, and record the power value of the interference signal output by signal generator 4 at this time so that the interference signal can be quickly adjusted in subsequent tests.
[0031] By using a magnetic field sensor coil to receive signals instead of the original probe, the problem of distance limitations between the magnetic field sensor coil and the loop antenna 1 is solved. When calibrating the field strength at different frequencies, there is no need to replace the magnetic field sensor coil, thus reducing the need to prepare too many magnetic field sensor coils, thereby reducing costs and simplifying the calibration process. At the same time, the size of the magnetic field sensor coil is not limited. By using a spectrum analyzer 2, the test frequency can meet the frequency requirements of the nearby magnetic field radiation immunity test, and the accuracy of the calibrated field strength is high, thereby improving the applicability of the anti-magnetic field radiation interference calibration device. At the same time, the spectrum analyzer 2 and the magnetic field sensor coil can effectively monitor and record the calibration values in real time, so as to truly evaluate the nearby magnetic field radiation immunity of electrical and electronic products or systems.
[0032] In some implementations, the loop antenna includes a matching network and a resonant circuit. The matching network has a resistance of 50 ohms to optimize signal transmission efficiency. The spectrum analyzer has a frequency range of 10 Hz to 40 GHz, covering all frequencies required for testing. A high-performance signal analyzer, such as the Keysight N9010B, can be used. The models of the loop antenna and the magnetic field sensor coil can be selected according to actual needs; for example, the loop antenna can be a FESP 5132 or HFRA 5164, and the magnetic field sensor coil can be a FESP 5134-40 or ESP 5134-1.
[0033] In summary, this invention provides a magnetic field radiation interference calibrator. By using a magnetic field sensor coil instead of the original probe to receive signals, it solves the problem of distance limitations between the magnetic field sensor coil and the loop antenna. When calibrating field strength at different frequencies, there is no need to replace the magnetic field sensor coil, thus reducing the need for excessive coils, lowering costs, and simplifying the calibration process. Furthermore, the size of the magnetic field sensor coil is not limited. By utilizing a spectrum analyzer, the test frequency meets the frequency requirements for nearby magnetic field radiation interference testing, resulting in high accuracy of the calibrated field strength and improving the applicability of the magnetic field radiation interference calibrator. Simultaneously, the spectrum analyzer and magnetic field sensor coil effectively monitor and record calibration values in real time, enabling a true assessment of the nearby magnetic field radiation interference immunity of electrical and electronic products or systems.
[0034] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.
Claims
1. A calibration device resistant to magnetic field radiation interference, characterized in that, include: The system includes a loop antenna, a signal generator, a low-frequency power amplifier, a spectrum analyzer, and a magnetic field sensor coil. The magnetic field sensor coil is mounted on the loop antenna. The loop antenna is connected to the low-frequency power amplifier, which is connected to the signal generator. The magnetic field sensor coil is connected to the spectrum analyzer.
2. The anti-magnetic field radiation interference calibration device according to claim 1, characterized in that, The loop antenna includes a matching network and a resonant circuit.
3. The anti-magnetic field radiation interference calibration device according to claim 2, characterized in that, The resistance of the matching network is 50 ohms.
4. The anti-magnetic field radiation interference calibration device according to claim 1, characterized in that, The frequency range of the spectrum analyzer is 10 Hz to 40 GHz.
5. The anti-magnetic field radiation interference calibration device according to claim 1, characterized in that, The spectrum analyzer used is a Keysight N9010B.
6. The anti-magnetic field radiation interference calibration device according to claim 1, characterized in that, The model of the loop antenna includes FESP 5132.
7. The anti-magnetic field radiation interference calibration device according to claim 1, characterized in that, The model of the loop antenna also includes HFRA 5164.
8. The anti-magnetic field radiation interference calibration device according to claim 1, characterized in that, The magnetic field sensor coil is model FESP 5134-40.
9. The anti-magnetic field radiation interference calibration device according to claim 1, characterized in that, The magnetic field sensor coil also includes the ESP 5134-1 model.