CN103743985A - Method for testing shielding effectiveness of textile material under complex electromagnetic environment - Google Patents
Method for testing shielding effectiveness of textile material under complex electromagnetic environment Download PDFInfo
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- CN103743985A CN103743985A CN201410032787.XA CN201410032787A CN103743985A CN 103743985 A CN103743985 A CN 103743985A CN 201410032787 A CN201410032787 A CN 201410032787A CN 103743985 A CN103743985 A CN 103743985A
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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
The present invention relates to a kind of method of test fabric Materials ' Shielding Effectiveness, belong to shield effectiveness technical field of measurement and test, be more suitable for the test of textile material shield effectiveness under testing complex electromagnetic environment.
Background technology
At present, conventional Materials ' Shielding Effectiveness method of testing mainly contains screened room window technique, flange coaxial method, ASTM coaxial transmission collimation method, the two box methods of ASTM-ES-7 and improved MIL-STD-285 mensuration etc., and these standard methods are generally tested shield effectiveness by the vertical irradiation of single plane electromagnetic wave.Yet in the middle of reality is used, shielding material often needs complicated, the severe a lot of electromagnetic environment of this idealized test environment of shielding ratio.Such as in fields such as weaponry, Industry Control instrument room, vehicular traffics, and the mimo context of the main cabin of the instrument room of Large-Scale Equipment, passenger plane and spacecraft, work chamber, mobile communication etc., in these environment, there is the electromagnetism from external environment condition to threaten, also the electromagnetic interference (EMI) that has the personal electronic equipments such as PC from inner space, mobile communication equipment, because the multiple reflections of electromagnetic field and cavity shield wall or shell forms the electromagnetic environment of relative complex, in NASA report, be called " electromagnetic environment in chamber ".Now, adopt traditional shield effectiveness method of testing just cannot accurate evaluation material for the screening ability of this type electromagnetic environment.
Reverberation chamber is a kind of emerging emc testing place, and the electromagnetic environment that Electromagnetic Wave Propagation direction is various, polarization mode is random can be provided, and can be used for the emc testings such as radiation immunity, radiation-emitting, antenna efficiency and shield effectiveness.The electromagnetic environment situation that the electromagnetic environment providing due to reverberation chamber and material run into is in actual use more approaching, so Reverberation room method Materials ' Shielding Effectiveness test result closing to reality is the technology trends of following evaluating material screening ability.
For this reason, International Electrotechnical Commission proposes a little reverberation chamber that has test window to be positioned in reverberation chamber, and loads tested material at test window, carrys out the shield effectiveness of Calculating material by contrasting average power content in large and small reverberation chamber.Yet the method cannot be eliminated the impact of test window on result, wherein the most significant problem is exactly when not loading tested material, and because of the aperture-coupled effect of test window, the shield effectiveness value obtaining is also non-vanishing.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of simple and quick, and test result accurately and reliably, is not affected by window size, the method to textile material shield effectiveness under the blanket practical testing complex electromagnetic environment of various tested textile materials.
For addressing the above problem, the present invention adopts following technical scheme:
Step 1: build a hollow metal cavity, at described hollow metal housing surface, window and first wave guide hole are set, electrometer of field strength and the first stirrer are placed in described hollow metal cavity, described hollow metal cavity is placed in reverberation chamber;
Step 2: build reverberation chamber working environment:
By optical fiber, pass waveguide aperture the signal of electrometer of field strength in hollow metal cavity is spread out of, described optical fiber spreads out of to computing machine through the Second Wave guide hole on reverberation locular wall again, and described reverberation chamber is interior, outer the second stirrer and the emitting antenna placed of hollow metal cavity;
Step 3: tested textile material is close to and is covered on described window, the parameter of emitting antenna is set and starts, open the first stirrer and the second stirrer simultaneously;
The electric field intensity that now electrometer of field strength gathers is once just recorded once in the every stepping rotation of described the first stirrer and the second stirrer, calculates its average field intensity value and is denoted as E
1;
Step 4: remove the tested textile material on described window, keep electrometer of field strength invariant position in step 1, the parameter constant that keeps emitting antenna in step 3, keep the stirring efficiency of the first stirrer and the second stirrer constant, the electric field intensity that now electrometer of field strength gathers is once just recorded once in the every stepping rotation of described the first stirrer and the second stirrer, calculates its average field intensity value and is denoted as E
2;
Step 5: adopt following formula (1) calculate tested textile material shielding properties SE:
SE=20*log(E
1/ E
2) （1）。
Described tested textile material is close to and is covered on window by flange.
The direction of described emitting antenna is aimed at its nearest corner of reverberation indoor distances.
In described step 3, the stepping rotating speed of the first stirrer and the second stirrer is consistent.
The invention has the beneficial effects as follows: (1) this method has been avoided within it, outer both sides arrange respectively electrometer of field strength, only an electrometer of field strength need be set in hollow cavity, test result is not subject to the impact of window size, and testing apparatus is simpler, test result is more stable, and repeatability is better.(2) because the size to window does not require, for the higher textile material of some cost or some, because of self character relation, cannot do large textile material, more applicable, usable range is wide.(3) utilize the multiple directions electromagnetic radiation producing in reverberation chamber, more approach the electromagnetic environment in real work, the test result according to single direction one train wave radiation has more practicality.(4), except testing according to the hollow cavity that need to select appropriate window of tested textile material, without adding new equipment, be easy to apply under reverberation chamber condition.
Accompanying drawing explanation
Accompanying drawing 1 is method of testing process flow diagram of the present invention.
Embodiment
Below in conjunction with Figure of description 1 and embodiment, the present invention is further described:
Described hollow metal cavity is that the length of side is the rectangle of 55*50cm, and window is that diameter is the circular hole of 45cm.As shown in Figure 1, its operation steps is as follows:
Step 1: build a hollow metal cavity, at described hollow metal housing surface, window and first wave guide hole are set, electrometer of field strength and the first stirrer are placed in described hollow metal cavity, described hollow metal cavity is placed in reverberation chamber perform region;
Step 2: build reverberation chamber working environment:
By optical fiber, pass waveguide aperture the signal of electrometer of field strength in hollow metal cavity is spread out of, described optical fiber spreads out of to computing machine through the Second Wave guide hole on reverberation locular wall again, and described reverberation chamber is interior, outer the second stirrer and the emitting antenna placed of hollow metal cavity;
Step 3: tested textile material is close to and is covered on described window, the parameter of emitting antenna is set and starts, open the first stirrer with the second stirrer simultaneously and make its rotating speed consistent;
The electric field intensity that now electrometer of field strength gathers is once just recorded once in the every stepping rotation of described the first stirrer and the second stirrer, calculates its average field intensity value and is denoted as E
1;
Step 4: remove the tested textile material on described window, keep electrometer of field strength invariant position in step 1, the parameter constant that keeps emitting antenna in step 3, keep the stirring efficiency of the first stirrer and the second stirrer constant, the electric field intensity that now electrometer of field strength gathers is once just recorded once in the every stepping rotation of described the first stirrer and the second stirrer, calculates its average field intensity value and is denoted as E
2;
Step 5: adopt following formula (1) calculate tested textile material shielding properties SE:
SE=20*log(E
1/ E
2) （1）。
Embodiment 2: the rectangle that the length of side of described hollow metal cavity is 55*50cm, described window is changed into the square hole of 30*30cm, and other conditions are constant, repeat above-mentioned steps 1 ~ 5, can find, and test result is not subject to the impact of window size.
Described tested textile material is close to and is covered on window by flange.
Described emitting antenna is placed in reverberation chamber, and its distance apart from each corner in reverberation chamber is different, and the aligning direction of emitting antenna is its that nearest corner of reverberation indoor distances.
In described step 3, the stepping rotating speed of the first stirrer and the second stirrer is consistent.
This method has been avoided within it, outer both sides arrange respectively electrometer of field strength, only an electrometer of field strength need be set in hollow cavity, and test result is not subject to the impact of window size, and testing apparatus is simpler, and test result is more stable, and repeatability is better.
Because the size to window does not require, for the higher textile material of some cost or some, because of self character relation, cannot do large textile material, more applicable, usable range is wide.
The multiple directions electromagnetic radiation that utilization produces in reverberation chamber, more approaches the electromagnetic environment in real work, and the test result according to single direction one train wave radiation has more practicality.
Except testing according to the hollow cavity that need to select appropriate window of tested textile material, without adding new equipment, be easy to apply under reverberation chamber condition.
The above; be only preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, in the technical scope that any those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.
Claims (4)
1. a method for textile material shield effectiveness under testing complex electromagnetic environment, is characterized in that step is as follows:
Step 1: build a hollow metal cavity, at described hollow metal housing surface, window and first wave guide hole are set, electrometer of field strength and the first stirrer are placed in described hollow metal cavity, described hollow metal cavity is placed in reverberation chamber;
Step 2: build reverberation chamber working environment:
By optical fiber, pass waveguide aperture the signal of electrometer of field strength in hollow metal cavity is spread out of, described optical fiber spreads out of to computing machine through the Second Wave guide hole on reverberation locular wall again, and described reverberation chamber is interior, outer the second stirrer and the emitting antenna placed of hollow metal cavity;
Step 3: tested textile material is close to and is covered on described window, the parameter of emitting antenna is set and starts, open the first stirrer and the second stirrer simultaneously;
The electric field intensity that now electrometer of field strength gathers is once just recorded once in the every stepping rotation of described the first stirrer and the second stirrer, calculates its average field intensity value and is denoted as E
1;
Step 4: remove the tested textile material on described window, keep electrometer of field strength invariant position in step 1, the parameter constant that keeps emitting antenna in step 3, keep the stirring efficiency of the first stirrer and the second stirrer constant, the electric field intensity that now electrometer of field strength gathers is once just recorded once in the every stepping rotation of described the first stirrer and the second stirrer, calculates its average field intensity value and is denoted as E
2;
Step 5: adopt following formula (1) calculate tested textile material shielding properties SE:
SE=20*log(E
1/ E
2) （1）。
2. the method for textile material shield effectiveness under testing complex electromagnetic environment according to claim 1, is characterized in that: described tested textile material is close to and is covered on window by flange.
3. the method for textile material shield effectiveness under testing complex electromagnetic environment according to claim 2, is characterized in that: the direction of described emitting antenna is aimed at its nearest corner of reverberation indoor distances.
4. the method for textile material shield effectiveness under testing complex electromagnetic environment according to claim 3, is characterized in that: in described step 3, the stepping rotating speed of the first stirrer and the second stirrer is consistent.
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Cited By (5)
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| CN104330658A (en) * | 2014-10-14 | 2015-02-04 | 华北电力大学 | Device and method for testing shielding effectiveness of material in low-frequency electric field |
| CN106291128A (en) * | 2016-08-29 | 2017-01-04 | 航宇救生装备有限公司 | A kind of detection method of aviation magnetic radiation protective garment |
| CN106443208A (en) * | 2016-11-29 | 2017-02-22 | 中国人民解放军军械工程学院 | Shielding effectiveness measuring method, measuring system and calibration system of shielding material |
| CN107255755A (en) * | 2017-06-27 | 2017-10-17 | 华北电力大学 | A kind of subregion analytic modell analytical model for calculating field distribution inside perforate rectangular shield body |
| CN109406899A (en) * | 2018-11-12 | 2019-03-01 | 中国科学院长春光学精密机械与物理研究所 | Active light transmission shielding membrane shield effect test method, apparatus and system |
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| JP2013210360A (en) * | 2012-02-28 | 2013-10-10 | Unitika Ltd | Radiation shielding sheet, and radiation shielding bag body formed by sewing the radiation shielding sheet |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330658A (en) * | 2014-10-14 | 2015-02-04 | 华北电力大学 | Device and method for testing shielding effectiveness of material in low-frequency electric field |
| CN106291128A (en) * | 2016-08-29 | 2017-01-04 | 航宇救生装备有限公司 | A kind of detection method of aviation magnetic radiation protective garment |
| CN106443208A (en) * | 2016-11-29 | 2017-02-22 | 中国人民解放军军械工程学院 | Shielding effectiveness measuring method, measuring system and calibration system of shielding material |
| CN106443208B (en) * | 2016-11-29 | 2019-07-09 | 中国人民解放军军械工程学院 | Shield effectiveness measurement method, measuring system and the calibration system of shielding material |
| CN107255755A (en) * | 2017-06-27 | 2017-10-17 | 华北电力大学 | A kind of subregion analytic modell analytical model for calculating field distribution inside perforate rectangular shield body |
| CN107255755B (en) * | 2017-06-27 | 2019-09-20 | 华北电力大学 | A method of calculating the subregion analytic modell analytical model of field distribution inside aperture rectangular shield body |
| CN109406899A (en) * | 2018-11-12 | 2019-03-01 | 中国科学院长春光学精密机械与物理研究所 | Active light transmission shielding membrane shield effect test method, apparatus and system |
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| CN103743985B (en) | 2016-09-07 |
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