CN105823935A - Device and method for field uniformity testing of semi-anechoic chamber - Google Patents
Device and method for field uniformity testing of semi-anechoic chamber Download PDFInfo
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- CN105823935A CN105823935A CN201610317732.2A CN201610317732A CN105823935A CN 105823935 A CN105823935 A CN 105823935A CN 201610317732 A CN201610317732 A CN 201610317732A CN 105823935 A CN105823935 A CN 105823935A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0821—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning rooms and test sites therefor, e.g. anechoic chambers, open field sites or TEM cells
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The invention discloses a device for field uniformity testing of a semi-anechoic chamber. The device comprises the semi-anechoic chamber and a control room, wherein the control room is located outside the semi-anechoic chamber; the semi-anechoic chamber and the control room are mutually independent; a transmitting antenna and an all-directional field probe are disposed in the semi-anechoic chamber; a wave absorbing material is paved on the ground between the transmitting antenna and the all-directional field probe; and a signal generator is disposed in the control room and successively connected to a power amplifier and a directional coupler, and the directional coupler is connected to the transmitting antenna which is located in the semi-anechoic chamber by a radio frequency cable. The device disclosed by the invention is characterized in that field uniformity tests of different sizes of semi-anechoic chambers can be implemented; and an optimal position of an EUT in an electromagnetic radiation susceptibility experiment can be found according to the different sizes of the semi-anechoic chambers. In this way, anti-interference performance of the EUT can be assessed more accurately; results are more accurate and reliable; testing efficiency is increased; and testing cost and production cost are reduced effectively.
Description
Technical field
The invention belongs to technical field of electromagnetic compatibility, particularly to a kind of semi-anechoic chamber field uniformity test devices and methods therefor.
Background technology
Along with extensively application and the development of radiotechnics, various radios constantly gush out so that the interference between equipment is increasingly severe.Simultaneously, electronic technology improves constantly with computer technology, the integrated level of system is more and more higher, the frequency band of electronic equipment is widened day by day, and sensitivity improves, and the cable system of equipment room becomes to become increasingly complex, therefore, in order to enable a device to normally work, it is necessary to the interference free performance of equipment is estimated, this radiation anti-interference experiment being accomplished by equipment carries out electromagnetic field.Semi-anechoic chamber is by the main place of radiation interference test, and field uniformity is as the important indicator weighing experimental site performance, it is to ensure that the key that experiment effectively goes on, is also to ensure that EUT key of the reproducibility and reliability of test result in electromagnetic radiation immunity experiment.Therefore it is very important for carrying out semi-anechoic chamber midfield uniformity testing assessment.
The conventional method of field uniformity calibration is based on IEC61000-4-3:2010 " EMC test and measuring technology radio frequency electromagnetic field radiation immunity experiment ", in regulation frequency range, the vertical checkout face of calibration is carried out field uniformity test, mainly limit vertical area to be measured, calibration point to be measured divides, then record every bit field intensity value is obtained, judge whether in range of tolerable variance with this, this method can make EUT be in a relatively uniform interference of electromagnetic field in vertical irradiation plane, it is ensured that the relative precision of result.
Summary of the invention
Goal of the invention: the present invention provides a kind of semi-anechoic chamber field uniformity test devices and methods therefor, to solve the problems of the prior art.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
A kind of semi-anechoic chamber field uniformity test device, including semi-anechoic chamber and control room, described control room is positioned at outside semi-anechoic chamber, and semi-anechoic chamber and control room separate space each other,
It is provided with in described semi-anechoic chamber on the floor, darkroom between transmitting antenna and omnidirectional's Field probe, and transmitting antenna and omnidirectional's Field probe and is equipped with absorbing material；
It is provided with signal generator in described control room, described signal generator is sequentially connected with power amplifier and directional coupler, described directional coupler connects the transmitting antenna being positioned at semi-anechoic chamber by radio-frequency cable, and described directional coupler is also associated with energy meter；Being additionally provided with field intentisy meter in described control room, described field intentisy meter connects the omnidirectional's Field probe being positioned at semi-anechoic chamber by optical fiber.
Further, the distance between described transmitting antenna and omnidirectional's Field probe is 1m.
Further, longitudinal midpoint of described transmitting antenna and the height on omnidirectional's Field probe distance semi-anechoic chamber ground are all not less than 0.8m.
Further, it is test plane that the height on distance semi-anechoic chamber ground is not less than the horizontal plane of 0.8m, has district to be measured, have horizontal homogeneous territory in district to be measured in test plane.
Further, above horizontal homogeneous territory and be perpendicular to horizontal homogeneous territory and be provided with vertical checkout face, it is provided with equally spaced 16 test points in described vertical checkout face, and test point is 4 row 4 row arrangements.
Further, distance is left between described test point and the body of wall of semi-anechoic chamber.
Further, being additionally provided with testboard in described semi-anechoic chamber, described testboard is perpendicular to the longitudinally asymmetric axle of semi-anechoic chamber.
Further, the wall of described semi-anechoic chamber is provided with the converting interface of body of wall.
A kind of semi-anechoic chamber field uniformity method of testing, comprises the following steps:
The first step: assemble test device；
Second step: choose test plane in semi-anechoic chamber, described test plane is highly to be not less than the horizontal plane of 0.8m, then test plane in, with test plane central shaft as the axis of symmetry, choose a rectangular district 19 to be measured, then district 19 to be measured is carried out equally spaced mesh point division；
3rd step: omnidirectional's Field probe 4 is placed on the mesh point in district 19 to be measured, launch antenna 3 and omnidirectional's Field probe 4 in the plane in district 19 to be measured on a longitudinal straight line, and the distance launched between antenna 3 and omnidirectional's Field probe 4 is 1m, then record the field intensity value of this mesh point；Omnidirectional's Field probe 4 is placed on each mesh point, obtain the field intensity value of each mesh point, in the process, launch antenna 3 to change along with the change of omnidirectional's Field probe 4 position all the time, and remain that transmitting antenna 3 and the omnidirectional's Field probe 4 longitudinally opposed distance in the plane in district 19 to be measured are 1m.
4th step: obtain in district 19 to be measured after the field intensity value of all mesh points, a square region is chosen in district 19 to be measured, and accounting for the 75% of all mesh point quantity at this region internal net point field intensity tolerance mesh point in the range of 0-+6db, this region is horizontal homogeneous territory 20.
5th step: above horizontal homogeneous territory and be perpendicular to horizontal homogeneous territory and choose vertical checkout face, equally spaced 16 test points are chosen in vertical checkout face, with vertical checkout face, the longitudinally asymmetric axle of 18 is as axle, and respectively to the extended test point of both lateral sides, and test point is 4 row 4 row arrangements；
6th step: successively each test point is carried out frequency sweep, obtains field intensity value.
Beneficial effect: the present invention mainly can carry out the test of field uniformity to various sizes of semi-anechoic chamber, can be according to different semi-anechoic chamber sizes, search out the optimum position of EUT in electromagnetic radiation immunity experiment, it is thus possible to assess the interference free performance of EUT more accurately, make result the most accurately and reliably, improve testing efficiency, effectively reduce testing cost and production cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of semi-anechoic chamber；
Fig. 3 is the top view of semi-anechoic chamber；
Fig. 4 is the structural representation in vertical checkout face；
Fig. 5 is test point scattergram；
Fig. 6 is the field strength distribution situation map of diverse location；
Fig. 7 is the graphics of frequency, cental axial position and electric field intensity；
Wherein: 1-semi-anechoic chamber, 2-control room, 3-launches antenna, 4-omnidirectional Field probe, 5-absorbing material, 6-signal generator, 7-power amplifier, 8-directional coupler, 9-radio-frequency cable, 10-energy meter, 11-field intentisy meter, 12-optical fiber, 13-testboard, 14-converting interface, 15-tests plane, floor, 16-darkroom, 17-test point, 18-vertical checkout face, 19-district to be measured, 20-horizontal homogeneous territory.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
As it can be seen, a kind of semi-anechoic chamber field uniformity test device, including semi-anechoic chamber 1 and control room 2, described control room 2 is positioned at outside semi-anechoic chamber 1, and semi-anechoic chamber 1 and control room 2 separate space each other,
It is provided with in described semi-anechoic chamber 1 on the floor, darkroom between transmitting antenna 3 and omnidirectional's Field probe 4, and transmitting antenna 3 and omnidirectional's Field probe 4 and is equipped with absorbing material 5；
It is provided with signal generator 6 in described control room 2, described signal generator 6 is sequentially connected with power amplifier 7 and directional coupler 8, described directional coupler 8 connects the transmitting antenna 3 being positioned at semi-anechoic chamber 1 by radio-frequency cable 9, and described directional coupler 8 is also associated with energy meter 10；Being additionally provided with field intentisy meter 11 in described control room 2, described field intentisy meter 11 connects the omnidirectional's Field probe 4 being positioned at semi-anechoic chamber 1 by optical fiber 12.
Distance between described transmitting antenna 3 and omnidirectional's Field probe 4 is 1m.
Longitudinal midpoint and the omnidirectional's Field probe 4 height apart from semi-anechoic chamber 1 ground of described transmitting antenna 3 are all not less than 0.8m.
It is test plane 15 that the height on distance semi-anechoic chamber 1 ground is not less than the horizontal plane of 0.8m, has district 19 to be measured, have horizontal homogeneous territory 20 in district 19 to be measured in test plane 15.
It is test plane 15 that longitudinal midpoint of described transmitting antenna 3 and the omnidirectional's Field probe 4 height apart from ground are all not less than the horizontal plane of 0.8m, has district 19 to be measured, have horizontal homogeneous territory 20 in district 19 to be measured in test plane 15.
Above horizontal homogeneous territory 20 and be perpendicular to horizontal homogeneous territory 20 and be provided with vertical checkout face 18, it is provided with equally spaced 16 test points 17 in described vertical checkout face 28, and test point 17 is in 4 row 4 row arrangements.
Distance is left between described test point 17 and the body of wall of semi-anechoic chamber 1.
Being additionally provided with testboard 13 in described semi-anechoic chamber 1, described testboard 13 is perpendicular to the longitudinally asymmetric axle of semi-anechoic chamber 1.
The converting interface 14 of body of wall it is provided with on the wall of described semi-anechoic chamber 1, described signal generator 6 produces a sine wave signal, after power amplifier 7 amplifies, through RF cable 9, by the converting interface 14 of body of wall, finally transfer signals to launch antenna 3, launch antenna 3 and the signal of telecommunication of amplification is launched in the form of an electromagnetic wave, thus in semi-anechoic chamber 1, produce electromagnetic field.
Each instrument, before being arranged test, is first calibrated, it is ensured that all appts is in normal duty, it is ensured that the accuracy of experiment by this device.As in figure 2 it is shown, owing to can not set up a uniform field near reference horizontal plane of manufacturing, therefore test plane 15 should be on the certain height of distance reference ground level, and height should be not less than 0.8m.
As shown in Figure 4, in test plane 15, with central shaft as the axis of symmetry, choose long and wide certain rectangle district to be measured 19, in district to be measured, then determine horizontal homogeneous territory 20, finally determine vertical checkout face 18.
Wherein, the density of mesh point can select according to practical situation, step-length should be avoided excessive and the inaccuracy of result that causes, avoid step-length too small again and increase workload, the efficiency of impact test.
As it is shown in figure 5, need in vertical checkout face 18 to choose 16 test points 17, with vertical checkout face, the longitudinally asymmetric axle of 18 is as axle, extends to both lateral sides respectively, chooses certain width.Hereafter being arranged test point 17 in this region, test point 17 is arranged in 4 row 4 row in vertical checkout face 18, and the distance between each test point 17 is equal, and maintains a certain distance from semi-anechoic chamber 1 body of wall.The spacing choosing each test point 17 in the present embodiment is 0.5m.
As shown in Figure 1, during test, described signal generator 6 produces a sine wave signal, after power amplifier 7 amplifies, through RF cable 9, by the converting interface 14 of body of wall, finally transfer signals to launch antenna 3, launch antenna 3 to be launched in the form of an electromagnetic wave by the signal of telecommunication of amplification, thus in semi-anechoic chamber 1, produce electromagnetic field.On the position of range transmission antenna 3 certain distance, with omnidirectional's Field probe 4, the field intensity of test point 17 is monitored.Launch the relative distance remaining certain length between antenna 3 and omnidirectional's Field probe 4, the height launching antenna 3 central axis distance ground should keep consistent with test plane, omnidirectional's Field probe 4 and the central axis launching antenna 3 are in same level, and all the time with on the straight line of semi-anechoic chamber 1 centerline axis parallel, launch antenna 3 to move along with the movement of omnidirectional's Field probe 4, primarily to make omnidirectional's Field probe 4 be in all the time in the 3dB beam angle launching antenna 3, make result more accurate and effective, get rid of and launch the interference that signal is caused.Meanwhile, absorbing material 5 should be spread between antenna 3 and omnidirectional's Field probe 4 launching, reduce the reflection on ground, the even results of enhanced field.
A kind of semi-anechoic chamber field uniformity method of testing, comprises the following steps:
Assemble test device；
Test plane is chosen in semi-anechoic chamber, described test plane is highly to be not less than the horizontal plane of 0.8m, then test plane in, with test plane central shaft as the axis of symmetry, choose a rectangular district 19 to be measured, then district 19 to be measured is carried out equally spaced mesh point division；
Omnidirectional's Field probe 4 is placed on the mesh point in district 19 to be measured, launches antenna 3 and omnidirectional's Field probe 4 in the plane in district 19 to be measured on a longitudinal straight line, and the distance launched between antenna 3 and omnidirectional's Field probe 4 is 1m, then records the field intensity value of this mesh point；Omnidirectional's Field probe 4 is placed on each mesh point, obtain the field intensity value of each mesh point, in the process, launch antenna 3 to change along with the change of omnidirectional's Field probe 4 position all the time, and remain that transmitting antenna 3 and the omnidirectional's Field probe 4 longitudinally opposed distance in the plane in district 19 to be measured are 1m.
Obtaining in district 19 to be measured, after the field intensity value of all mesh points, choosing a square region, and account for the 75% of all mesh point quantity at this region internal net point field intensity tolerance mesh point in the range of 0-+6db in district 19 to be measured, this region is horizontal homogeneous territory 20.
Above horizontal homogeneous territory and be perpendicular to horizontal homogeneous territory and choose vertical checkout face, equally spaced 16 test points are chosen in vertical checkout face, with vertical checkout face, the longitudinally asymmetric axle of 18 is as axle, and respectively to the extended test point of both lateral sides, and test point is 4 row 4 row arrangements；
Successively each test point is carried out frequency sweep, obtain field intensity value.
By determining " uniform territory " i.e. horizontal homogeneous territory 20 at horizontal plane, then in this region, in regulation frequency range, the vertical checkout face of calibration is carried out field uniformity test according to IEC61000-4-3:2010 " EMC test and measuring technology radio frequency electromagnetic field radiation immunity experiment ".Omnidirectional's Field probe 4 is placed in any point of 16 test points 17, and regulation signal generator 6 makes signal source frequency to testing lower-frequency limit, still uses firm power method, and the forward power of antenna 3, record forward power and field intensity value are launched in regulation.Increase frequency with the 1% of ongoing frequency for maximal increment, repeat previous step, until it reaches the upper limit of test frequency, surveyed 16 test points 17 according to this.If in the result of test, having the region of 75% in regulation region, the range of tolerable variance of field intensity is 0dB-+6dB, then it is assumed that the field in this region is uniform.In this region, EUT is carried out electromagnetic radiation immunity experiment, so record result more accurate and effective.This invention improves testing efficiency, effectively reduces testing cost and production cost, meets the production development requirement of science and technology.
When carrying out radiating anti-interference test in different dark room conditions, need the field uniformity of EUT shadow surface is carried out test analysis, in order to carry out the test analysis of field uniformity, first, it would be desirable to determine the horizontal level of EUT shadow surface, in the horizontal plane of certain altitude, determine a test plane, average at this test plane field, fluctuating less, meanwhile, the size of field intensity is in certain range of tolerable variance.Then, testing plane determined by according to, in the vertical checkout face (i.e. EUT irradiated plane) of this test plane, in utilization standard, the method for testing of field uniformity searches out the uniform territory of radiating surface, in this uniform territory, field intensity is also required to meet certain tolerance simultaneously.By such field uniformity method of testing, it is possible to make darkroom to radiate the result of anti-interference test more accurately effectively, thus the capacity of resisting disturbance of accurate evaluation EUT, improve testing efficiency, effectively reduce testing cost and production cost.
As shown in Figure 6, in semi-anechoic chamber, same frequency signal is different in the field intensity of diverse location.1MHz with 10MHz is tested by respectively in each position of central shaft, the result obtained is as shown in the figure, as can be seen from the figure, the variation tendency of the field intensity value that 1MHz Yu 10MHz brings along with change in location is identical, the 1MHz field intensity value in each position is all bigger than 10MHz, probably starting at test parameter initial point 80cm, field intensity change is relatively small, illustrate in this distance range, in horizontal plane, field intensity can may thereby determine that, in certain range of tolerable variance, the region that a field intensity value distribution is relatively uniform.
The present invention is to solve the problem at various sizes of semi-anechoic chamber midfield uniformity test.When carrying out radiating anti-interference test in different dark room conditions, need the field uniformity of EUT shadow surface is carried out test analysis, in order to carry out the test analysis of field uniformity, first, it would be desirable to determine the horizontal level of EUT shadow surface, a district 19 to be measured is determined in the test plane 15 of certain altitude, determining a horizontal homogeneous region 20 in region 19 to be measured, in this region, field intensity is relatively flat all, fluctuates less, meanwhile, the size of field intensity is in certain range of tolerable variance.Then, horizontal homogeneous region 20 determined by according to, the vertical checkout face 18(i.e. EUT irradiated plane in this region) in, in utilization standard, the method for testing of field uniformity searches out the uniform territory of radiating surface, in this uniform territory, field intensity is also required to meet certain tolerance simultaneously.
As it is shown in fig. 7, in semi-anechoic chamber, by firm power frequency sweep method, obtained the 10kHz-30MHz distribution graphics in the field of different test points.Understanding in conjunction with Fig. 6, probably start at 80cm, field strength fluctuation is more uniform.
By such field uniformity method of testing, it is possible to make darkroom to radiate the result of anti-interference test more accurately effectively, thus the capacity of resisting disturbance of accurate evaluation EUT, improve testing efficiency, effectively reduce testing cost and production cost.
The present invention mainly can carry out the test of field uniformity to various sizes of semi-anechoic chamber, can be according to different semi-anechoic chamber sizes, search out the optimum position of EUT in electromagnetic radiation immunity experiment, it is thus possible to assess the interference free performance of EUT more accurately, make result the most accurately and reliably, improve testing efficiency, effectively reduce testing cost and production cost.
The above is only the preferred embodiment of the present invention; it is noted that, for those skilled in the art; under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (9)
1. a semi-anechoic chamber field uniformity test device, it is characterised in that: include that semi-anechoic chamber and control room, described control room are positioned at outside semi-anechoic chamber, and semi-anechoic chamber and control room separate space each other,
It is provided with in described semi-anechoic chamber on the floor, darkroom between transmitting antenna and omnidirectional's Field probe, and transmitting antenna and omnidirectional's Field probe and is equipped with absorbing material；
It is provided with signal generator in described control room, described signal generator is sequentially connected with power amplifier and directional coupler, described directional coupler connects the transmitting antenna being positioned at semi-anechoic chamber by radio-frequency cable, and described directional coupler is also associated with energy meter；Being additionally provided with field intentisy meter in described control room, described field intentisy meter connects the omnidirectional's Field probe being positioned at semi-anechoic chamber by optical fiber.
Semi-anechoic chamber field uniformity the most according to claim 1 test device, it is characterised in that: the distance between described transmitting antenna and omnidirectional's Field probe is 1m.
Semi-anechoic chamber field uniformity the most according to claim 1 test device, it is characterised in that: longitudinal midpoint of described transmitting antenna and the height on omnidirectional's Field probe distance semi-anechoic chamber ground are all not less than 0.8m.
Semi-anechoic chamber field uniformity the most according to claim 1 test device, it is characterised in that: it is test plane that the height on distance semi-anechoic chamber ground is not less than the horizontal plane of 0.8m, has district to be measured, have horizontal homogeneous territory in district to be measured in test plane.
Semi-anechoic chamber field uniformity the most according to claim 4 test device, it is characterized in that: above horizontal homogeneous territory and be perpendicular to horizontal homogeneous territory and be provided with vertical checkout face, it is provided with equally spaced 16 test points in described vertical checkout face, and test point is 4 row 4 row arrangements.
Semi-anechoic chamber field uniformity the most according to claim 5 test device, it is characterised in that: leave distance between described test point and the body of wall of semi-anechoic chamber.
Semi-anechoic chamber field uniformity the most according to claim 1 test device, it is characterised in that: being additionally provided with testboard in described semi-anechoic chamber, described testboard is perpendicular to the longitudinally asymmetric axle of semi-anechoic chamber.
Semi-anechoic chamber field uniformity the most according to claim 1 test device, it is characterised in that: it is provided with the converting interface of body of wall on the wall of described semi-anechoic chamber.
9. according to the arbitrary described semi-anechoic chamber field uniformity method of testing of claim 1-8, it is characterised in that comprise the following steps:
The first step: assemble test device；
Second step: choose test plane in semi-anechoic chamber, described test plane is highly to be not less than the horizontal plane of 0.8m, then test plane in, with test plane central shaft as the axis of symmetry, choose a rectangular district 19 to be measured, then district 19 to be measured is carried out equally spaced mesh point division；
3rd step: omnidirectional's Field probe 4 is placed on the mesh point in district 19 to be measured, launch antenna 3 and omnidirectional's Field probe 4 in the plane in district 19 to be measured on a longitudinal straight line, and the distance launched between antenna 3 and omnidirectional's Field probe 4 is 1m, then record the field intensity value of this mesh point；Omnidirectional's Field probe 4 is placed on each mesh point, obtain the field intensity value of each mesh point, in the process, launch antenna 3 to change along with the change of omnidirectional's Field probe 4 position all the time, and remain that transmitting antenna 3 and the omnidirectional's Field probe 4 longitudinally opposed distance in the plane in district 19 to be measured are 1m；
4th step: obtain in district 19 to be measured after the field intensity value of all mesh points, a square region is chosen in district 19 to be measured, and accounting for the 75% of all mesh point quantity at this region internal net point field intensity tolerance mesh point in the range of 0-+6db, this region is horizontal homogeneous territory 20；
5th step: above horizontal homogeneous territory and be perpendicular to horizontal homogeneous territory and choose vertical checkout face, equally spaced 16 test points are chosen in vertical checkout face, with vertical checkout face, the longitudinally asymmetric axle of 18 is as axle, and respectively to the extended test point of both lateral sides, and test point is 4 row 4 row arrangements；
6th step: successively each test point is carried out frequency sweep, obtains field intensity value.
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| CN107121600A (en) * | 2017-06-07 | 2017-09-01 | 中国工程物理研究院应用电子学研究所 | A kind of automatic testing equipment for testing aerial radiation field uniformity |
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