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Method for testing shielding effectiveness of textile material under complex electromagnetic environment

A fabric material, complex electromagnetic technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as the inability to eliminate the influence of the test window results, and achieve stable test results, wide range of use, and good repeatability.

Active Publication Date: 2014-04-23
PEOPLES LIBERATION ARMY ORDNANCE ENG COLLEGE
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Problems solved by technology

However, this method cannot eliminate the influence of the test window on the results. One of the most significant problems is that when the test material is not loaded, the shielding effectiveness value obtained is not zero due to the aperture coupling effect of the test window.

Method used

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  • Method for testing shielding effectiveness of textile material under complex electromagnetic environment

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Comparison scheme
Effect test

Embodiment 2

[0030] Embodiment 2: The side length of the hollow metal cavity is a rectangle of 55*50cm, the window is changed to a square hole of 30*30cm, other conditions remain unchanged, and the above steps 1~5 are repeated, it can be found that the test results Not affected by window size.

[0031] The tested fabric material is tightly covered on the window through the flange.

[0032] The transmitting antenna is placed in the reverberation chamber, and its distance from each corner of the reverberation chamber is different, and the direction of the transmitting antenna is the corner closest to it in the reverberation chamber.

[0033] In the step 3, the stepping speeds of the first agitator and the second agitator are consistent.

[0034] This method avoids setting up field strength meters on the inner and outer sides of the cavity, and only needs to set up a field strength meter in the hollow cavity. The test results are not affected by the size of the window. The test equipment is ...

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Abstract

The invention discloses a method for testing the shielding effectiveness of a textile material under a complex electromagnetic environment. The method comprises the following steps: (1) establishing a hollow metal cavity, wherein the hollow metal cavity is put in a reverberation room, and a window and a first waveguide hole are formed in the surface of the hollow metal cavity; a field intensity meter and a first stirrer are arranged in the hollow metal cavity; (2) constructing a reverberation room work environment; (3) enabling the to-be-tested textile material to closely cover the window, enabling the stirrer, recording electric field intensities acquired by the field intensity meter when the stirrer does step-by-step rotation each time, and computing an average electric field intensity value as E1; (4) removing the to-be-tested textile material on the window, keeping the field intensity meter in the step 1 unchanged in position, keeping all parameters in the step 3 constant, and computing an average electric field intensity value as E2; (5) computing the shielding effectiveness SE of the to-be-tested textile material by adopting a formula SE=20*log(E1 / E2) (1). The method disclosed by the invention has the advantages that the operation is simple and fast; a testing result is accurate and reliable, and not influenced by the size of the window.

Description

technical field [0001] The invention relates to a method for testing the shielding effectiveness of fabric materials, which belongs to the technical field of shielding effectiveness testing and is more suitable for testing the shielding effectiveness of fabric materials in complex electromagnetic environments. Background technique [0002] At present, the commonly used test methods for shielding effectiveness of materials mainly include shielded room window method, flange coaxial method, ASTM coaxial transmission line method, ASTM-ES-7 double box method and improved MIL-STD-285 measurement method, etc. These standards The method generally tests the shielding effectiveness by vertically irradiating a single plane of electromagnetic waves. However, in actual use, shielding materials often need to shield a much more complex and harsh electromagnetic environment than this idealized test environment. For example, in the fields of weaponry and equipment, industrial control instru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 程二威王庆国刘逸飞潘晓东万浩江周星王平平
Owner PEOPLES LIBERATION ARMY ORDNANCE ENG COLLEGE
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