Radiation magnetic moment test system of magnetic dipole radiator

Abstract

A radiation magnetic moment test system of a magnetic dipole radiator comprises three orthogonal electromagnetic measurement sensors arranged at a test point, the electromagnetic measurement sensors obtain magnetic field components under rectangular coordinates of the test point, and a radiation magnetic moment measurement value of the magnetic dipole radiator is calculated according to the magnetic field components. According to the radiation magnetic moment test system of the magnetic dipole radiator in the technical scheme of the utility model, only the size and the test distance of the electromagnetic emission system where the magnetic dipole radiator is located need to be given, so that a single magnetic dipole emission antenna or a magnetic dipole radiator formed by a plurality of magnetic dipole emission antennas can be tested; the field intensity component is tested under the condition of any angle and any frequency, and an effective technical approach is provided for accurate, complete and standard radiation magnetic moment testing of various electromagnetic emission systems.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic detection, in particular to a radiation magnetic moment test system for a magnetic dipole radiator. Background Art

[0002] The emission parameters of an electromagnetic detection system mainly include operating frequency, radiation magnetic moment, amplitude-frequency characteristic, and direction characteristic, where the radiation magnetic moment represents the intensity of the emitted electromagnetic field. For a given magnetic dipole emission system, the radiation magnetic moment is mainly related to the operating frequency and directivity. The radiation magnetic moment is a vector, and its magnitude depends on the principle, structure, shape, driving method, etc. of the magnetic dipole emission system. Currently, for the electromagnetic emission systems composed of two different magnetic dipole emission antennas or radiation devices, namely rod-shaped and arc-shaped ones, applied in engineering, due to the differences in internal structures and mechanisms, the distributions of the radiated electromagnetic fields are completely different. However, the adopted magnetic moment test methods both set a uniaxial electromagnetic sensor directly above the magnetic dipole emission system, at a distance of 600 mm from the surface of the emission antenna system for measurement, and convert according to the induced voltage value output by the electromagnetic sensor to determine whether the rated radiation magnetic moment is reached.

[0003] The above-mentioned radiation magnetic moment test method for the magnetic dipole emission system is limited to the tests at specific frequencies and in a single direction. Moreover, due to the too-close test distance, it does not meet the conditions for the magnetic dipole radiation field test, and has disadvantages such as the test results not conforming to the performance indicators, low accuracy, and poor consistency. For example, for the radiation electromagnetic field formed by a circular emission system composed of two arc-shaped antennas, the magnetic fields around the antennas or the system are not uniform, and the field strengths in the vertical and horizontal directions differ by about 1 time, and the maximum value is not in the vertical and horizontal directions. When the operating frequencies are separated by 30 HZ, the amplitudes differ by about 15%. Therefore, the existing test methods cannot accurately test the radiation magnetic moments and their field strength distribution characteristics under different electromagnetic antenna structures, different operating states, and operating conditions, resulting in inaccurate determination of the action distance of the electromagnetic detection system and inability to provide effective technical support for analyzing and solving practical problems in engineering. Summary of the Utility Model

[0004] The technical problem solved by the utility model is to provide a radiation magnetic moment test system for a magnetic dipole radiator, which solves the problem that the existing test methods cannot accurately test the radiation magnetic moments under different electromagnetic antenna structures, different operating states, and operating conditions.

[0005] To solve the above technical problem, an embodiment of the utility model provides a radiation magnetic moment test system for a magnetic dipole radiator, including three orthogonal electromagnetic measurement sensors arranged at a test point, where the electromagnetic measurement sensors are used to obtain the magnetic field components in the rectangular coordinates of the test point, and calculate the measured value of the radiation magnetic moment of the magnetic dipole radiator according to the magnetic field components.

[0006] Optionally, the magnetic field components of the test point in rectangular coordinates are:

[0007]

[0008] Where x, y, and z are the coordinates of the test point, μ is the relative magnetic permeability of the core, R is the effective distance of the magnetic dipole radiator, and K is the complex wave number.

[0009] The total field strength is:

[0010] At a distance r from the magnetic dipole transmitting system, the radiation magnetic moment measurement value M=H×r 3 .

[0011] Optionally, the distance between the electromagnetic measurement sensor and the equivalent surface of the magnetic dipole radiator is at least 5 to 8 times greater than the equivalent size of the magnetic dipole radiator.

[0012] Optionally, the distance between the electromagnetic measurement sensor and the equivalent surface of the magnetic dipole radiator is at least greater than 5 times the equivalent size of the magnetic dipole radiator.

[0013] Optionally, the environmental electromagnetic field interference of the test site is less than half of the sensitivity of the radiation magnetic moment test system.

[0014] Optionally, there is no ferromagnetic object within the effective range of the magnetic dipole radiator to affect the test result.

[0015] Optionally, the operating frequency band of the magnetic dipole radiator is low frequency.

[0016] Compared with the prior art, the technical solution of the embodiment of the utility model has the following beneficial effects:

[0017] The radiation magnetic moment test system of the magnetic dipole radiator of the technical solution of the utility model can test the field strength component of a single magnetic dipole transmitting antenna or a magnetic dipole radiator composed of multiple magnetic dipole transmitting antennas at any angle and any frequency conditions, only by giving the size of the electromagnetic transmitting system where the magnetic dipole radiator is located and the test distance. It provides an effective technical approach for accurate, complete and standardized radiation magnetic moment testing of various electromagnetic transmitting systems, and is particularly helpful for the calibration of performance parameters and product inspection and acceptance of magnetic dipole transmitting systems and their electromagnetic detection systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a schematic diagram of the structure of a radiation magnetic moment test system of a magnetic dipole radiator. DETAILED DESCRIPTION

[0019] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0020] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "length", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, it should not be construed as a limitation to the embodiments of the present invention.

[0021] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0022] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0023] The following disclosure provides many different embodiments or examples for implementing different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the embodiments of the present invention. In addition, the embodiments of the present invention may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0024] To better understand the purpose, structure, and function of the present invention, the following further describes in detail a radiation magnetic moment test system for a magnetic dipole radiator of the present invention with reference to the drawings.

[0025] Figure 1This is a schematic structural diagram of a radiation magnetic moment test system for a magnetic dipole radiator provided by the present utility model. Refer to Figure 1 A radiation magnetic moment test system for a magnetic dipole radiator includes three orthogonal electromagnetic measurement sensors 11 arranged at a test point. The electromagnetic measurement sensors 11 obtain the magnetic field components in the rectangular coordinates of the test point, and calculate the measured value of the radiation magnetic moment of the magnetic dipole radiator 12 based on the magnetic field components.

[0026] To accurately test the radiation magnetic moment of a complex magnetic dipole radiator in engineering, the following test conditions are stipulated:

[0027] The operating frequency band of the magnetic dipole radiator is low frequency and belongs to the magnetic dipole radiation field. The distance r between the electromagnetic measurement sensor and the equivalent surface of the magnetic dipole radiator is at least 5 to 8 times greater than the equivalent size D of the magnetic dipole radiator. In the embodiment of the present utility model, the distance r between the electromagnetic measurement sensor and the equivalent surface of the magnetic dipole radiator is at least 5 times greater than the equivalent size D of the magnetic dipole radiator, that is, the test conditions of the magnetic dipole radiation field are satisfied, and the influence of the magnetic dipole scale on the test is reduced to a negligible level;

[0028] Due to the influence of the test distance error on the test result, in the embodiment of the present utility model, a laser rangefinder or a special test bracket is used to ensure a relatively accurate test distance r; there is no large ferromagnetic body within the action distance of the magnetic dipole radiator to avoid the influence of electromagnetic reflection on the test result.

[0029] There should be no obvious electromagnetic interference source around the test site, and the environmental electromagnetic field interference of the test site is less than half of the sensitivity of the radiation magnetic moment test system.

[0030] Under the above test conditions, based on the distribution characteristics and propagation characteristics of the radiation electromagnetic field of the magnetic dipole emission system, for a magnetic dipole radiation source with a given magnetic moment, there is a certain corresponding relationship between the field strength at any point in space and the magnetic moment. The magnetic field components in the rectangular coordinates of the test point are obtained by coordinate transformation as follows:

[0031]

[0032]

[0033] where x, y, and z are the coordinates of the test point, μ is the relative magnetic permeability of the iron core, R is the action distance of the magnetic dipole radiator, and K is the complex wave number;

[0034] The total field strength is:

[0035] At a distance r from the magnetic dipole emission system, three orthogonal electromagnetic measurement sensors are used to test the three-dimensional radiation field, and the measured value of the radiation magnetic moment M = H × r 3 .

[0036] For the radiation magnetic moment test system of the magnetic dipole radiator of the technical solution of the present utility model, only by specifying the size of the electromagnetic emission system where the magnetic dipole radiator is located and the test distance, the field strength components of a single magnetic dipole emission antenna or a magnetic dipole radiator composed of multiple magnetic dipole emission antennas can be tested under any angle and any frequency conditions, providing an effective technical approach for accurate, complete and standardized radiation magnetic moment tests of various electromagnetic emission systems, and particularly contributing to the calibration of performance parameters and product detection and acceptance of magnetic dipole emission systems and their electromagnetic detection systems.

[0037] The embodiment of the present utility model also provides a test method for a radiation magnetic moment test system of a magnetic dipole radiator, which uses three orthogonal electromagnetic measurement sensors to test the magnetic dipole radiator, obtains the magnetic field components in the rectangular coordinates of the test point, and calculates the measured value of the radiation magnetic moment of the magnetic dipole radiator according to the magnetic field components.

[0038] According to the test method of the radiation magnetic moment test system of the magnetic dipole radiator, the measurement of the radiation magnetic moment and the field strength components of the magnetic dipole emission system with any structure at a certain distance r can be realized, and tests can also be carried out in different directions around the electromagnetic emission system as needed. When testing the radiation magnetic moment at different frequencies, the frequency characteristics of links such as electromagnetic receiving sensors are automatically compensated by the test system to realize the test of the radiation magnetic moment at any frequency, providing technical support for comprehensively and accurately grasping the distribution characteristics of the radiation field of the magnetic dipole emission system and the working performance of the electromagnetic detection system.

[0039] For the test method of the radiation magnetic moment test system of the magnetic dipole radiator of the technical solution of the present utility model, when using three orthogonal electromagnetic measurement sensors to conduct radiation electromagnetic field tests, it makes the determination of the measurement coordinates and the relative direction angles simple and easy to implement. Compared with the single field strength component measured by a single electromagnetic measurement sensor, the three orthogonal electromagnetic measurement sensors in the embodiment of the present utility model test the three-dimensional full field strength, and greatly reduce the influence of the direction angle of the observation point on the test results, having good flexibility, being convenient to operate, and being beneficial to improving the measurement accuracy and stability.

[0040] It can be understood that the present utility model is described through the above embodiments. Those skilled in the art know that without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. A radiation magnetic moment test system for a magnetic dipole radiator, characterized in that, For measuring the radiation magnetic moment of a magnetic dipole emission system, including: Three orthogonal electromagnetic measurement sensors arranged at the test point, the electromagnetic measurement sensors are used to obtain the magnetic field components in the rectangular coordinates of the test point, and the measured value of the radiation magnetic moment of the magnetic dipole radiator is calculated according to the magnetic field components.

2. The radiation magnetic moment test system of the magnetic dipole radiator according to claim 1, wherein The magnetic field components in the rectangular coordinates of the test point are: Where x, y, and z are the coordinates of the test point, μ is the relative magnetic permeability of the iron core, R is the action distance of the magnetic dipole radiator, and K is the complex wave number; The total field strength is: At a distance r from the magnetic dipole emission system, the measured value of the radiation magnetic moment M = H × r 3 .

3. The radiation magnetic moment test system of the magnetic dipole radiator according to claim 1, characterized in that The distance between the electromagnetic measurement sensor and the equivalent body surface of the magnetic dipole radiator is at least greater than 5 to 8 times the equivalent size of the magnetic dipole radiator.

4. The radiation magnetic moment test system of the magnetic dipole radiator according to claim 3, characterized in that, The distance between the electromagnetic measurement sensor and the equivalent body surface of the magnetic dipole radiator is at least greater than 5 times the equivalent size of the magnetic dipole radiator.

5. The radiation magnetic moment test system of the magnetic dipole radiator according to claim 1, characterized in that The environmental electromagnetic field interference of the test site is less than half of the sensitivity of the radiation magnetic moment test system.

6. The radiation magnetic moment test system of the magnetic dipole radiator according to claim 1, characterized in that, There is no ferromagnetic body within the action distance of the magnetic dipole radiator to affect the test results.

7. The radiation magnetic moment test system of the magnetic dipole radiator according to claim 1, characterized in that, The operating frequency band of the magnetic dipole radiator is low frequency.

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