CN112881825A - Reverberation room test system with temperature control system and test method - Google Patents
Reverberation room test system with temperature control system and test method Download PDFInfo
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- CN112881825A CN112881825A CN202110033143.2A CN202110033143A CN112881825A CN 112881825 A CN112881825 A CN 112881825A CN 202110033143 A CN202110033143 A CN 202110033143A CN 112881825 A CN112881825 A CN 112881825A
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- 238000012360 testing method Methods 0.000 title claims abstract description 64
- 238000010998 test method Methods 0.000 title abstract description 3
- 238000004321 preservation Methods 0.000 claims abstract description 35
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000000502 dialysis Methods 0.000 abstract description 5
- 238000003756 stirring Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 3
- 238000010907 mechanical stirring Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
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- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a reverberation room test system with a temperature control system and a test method, wherein the test system comprises: the device comprises a reverberation chamber, a stirrer assembly, a transmitting antenna, equipment to be tested, a heat preservation chamber, a temperature control system, an air inlet duct and an air return duct; the stirrer and the equipment to be tested are arranged in a reverberation chamber, and the stirrer changes the boundary condition of an electromagnetic field through mechanical rotation; the equipment to be tested is positioned in a working area of the reverberation chamber, and the working area is arranged in a heat preservation chamber containing six heat preservation dialysis plates; the heat preservation chamber is connected with a temperature control system through an air inlet duct and an air return duct, the whole body adopts a step-in type incubator structure, and a temperature control unit is connected with the heat preservation chamber inside the reverberation chamber through a pipeline, so that a high-low temperature environment is formed in a local volume area inside the reverberation chamber. The invention can effectively simulate the high-low temperature difference environment in practical application through the temperature control system, and realize the measurement of the equipment to be measured at the limit temperature.
Description
Technical Field
The invention relates to the technical field of electromagnetic compatibility testing, in particular to a reverberation room testing system with a temperature control system and a reverberation room testing method.
Background
Compared with the traditional electromagnetic compatibility test field, the reverberation room has outstanding advantages in the aspects of manufacturing cost, test time, test efficiency, effective simulation of a coincidence field and the like, and has attracted extensive attention in recent years. The reverberation chamber generates a variable electromagnetic field distribution in the reverberation chamber, so that an electromagnetic field with uniform statistical spatial distribution, incident direction and polarization direction is obtained, and the reverberation chamber can generate a statistically uniform electromagnetic field to perform RC (reverberation chamber) and RS (radiation immunity) tests of EMC, antenna efficiency tests and various electromagnetic tests including shell, material and cable shielding effectiveness tests.
The type of the reverberation chamber mainly comprises a mechanical stirring reverberation chamber, a frequency stirring reverberation chamber, a source stirring reverberation chamber and the like, wherein the mechanical stirring reverberation chamber depends on changing the boundary condition of the reverberation chamber and generally realizes the statistical uniform distribution of an electromagnetic field in the reverberation chamber through the stirring of a metal stirrer; the frequency stirring reverberation chamber achieves an electromagnetically statistically uniform reverberation chamber by generating a randomly varying operating frequency within a certain bandwidth around a nominal operating frequency; the source-stir reverberation chamber is a chamber that generates a statistically uniform electromagnetic field within the chamber by varying the position of the source.
The reverberation chamber by its nature produces a spatially uniform, isotropic, randomly polarized electromagnetic environment within the shielded cavity for measurement of the device under test. As an electromagnetic compatibility device, the basic structure of the reverberation chamber is that a metal electromagnetic closed shell is matched with one or more stirrers, generally rectangular shells, so that the reverberation chamber is equivalent to a metal waveguide resonant cavity, and the continuous stirring process of the stirrers is a process that the boundary conditions of the reverberation chamber are changed continuously.
At present, many researches on the reverberation room are carried out, including the optimization of parameters such as the size of the reverberation room, the form of a stirrer, the position of a transmitting and receiving antenna and the like, but related test descriptions of the tested device under different temperatures are not involved.
Disclosure of Invention
In order to overcome the above technical problems, an object of the present invention is to provide a reverberation room testing system with a temperature control system and a testing method thereof, which are used for testing devices to be tested at different operating temperatures.
In order to achieve the purpose, the invention adopts the technical scheme that:
a reverberation room test system with a temperature control system comprises a reverberation room 1 and a temperature control system 2, wherein a mechanical stirrer 3, a transmitting antenna 4 and a device under test 5 are arranged in the reverberation room 1, and the mechanical stirrer 3 changes the boundary condition of an electromagnetic field through mechanical rotation; the reverberation room 1 is internally provided with a working area, the equipment to be tested 5 is placed in the working area, the working area is arranged in a heat preservation room 6, and the heat preservation room 6 is connected with the temperature control system 2 through an air inlet duct 7 and an air return duct 8.
Furthermore, the number of the transmitting antennas 4 is set to be different according to requirements, and the working frequency of the transmitting antennas 4 is adjusted according to the test requirements so that the transmitting antennas can reach a matching state.
Furthermore, a rotary table 9 is arranged inside the reverberation chamber 1, the transmitting antenna 4 and the device to be tested 5 are selectively arranged on the rotary table 9, and the rotary table 9 rotates around a vertical rotating shaft to realize the test of the transmitting antenna 4 and the device to be tested 5 in multiple directions and positions.
Further, the mechanical stirrer 3 has stepping and rotating capabilities, and the size of the stirrer is matched to the lowest resonance frequency of the reverberation chamber 1.
Furthermore, the whole temperature control system 2 adopts a step-in type incubator structure, the temperature control system 2 comprises a unit box, and the unit box is connected with a heat preservation chamber 6 inside the reverberation chamber 1 through a pipeline, so that a high-low temperature environment is formed in a local volume area inside the reverberation chamber 1.
Further, the heat preservation chamber 6 is a cuboid structure, and the heat preservation chamber 6 is composed of six heat preservation dialysis plates.
Further, the maximum dimension of the mechanical stirrer 3 is not less than 75% of the maximum dimension of the reverberation chamber 1, and the stirrer rotation diameter is not less than l/4 of the wavelength of the lowest use frequency.
Further, the mechanical stirrer 3 includes a vertical stirrer and a horizontal stirrer.
Further, a motor control module 11, a vector network analyzer 12 and a rotary table control module 13 are arranged on the reverberation chamber 1, a temperature control module 14 is arranged on the temperature control system 2, and the motor control module 11 is connected with a driving motor 15 on the mechanical stirrer 3; the test port of the vector network analyzer 12 is respectively connected with the transmitting antenna 4 and the test equipment 5; the rotary table control module 13 is connected with the rotary table 9 for placing the transmitting antenna and testing; the motor control module 11, the vector network analyzer 12, the turntable control module 13 and the temperature control module 14 are respectively connected with the computer 10 through a GPIB or USB standard interface, and the computer 10 is used for controlling stepping and rotating speed of the mechanical stirrer 3, rotating speed of the turntable 9, testing frequency and relevant parameters of testing temperature.
A method for testing a reverberation room test system with a temperature control system comprises the following steps:
the method comprises the following steps: adjusting a transmitting antenna 4 at a proper position in a reverberation chamber 1, placing a device to be tested 5 on a rotary table 9 in a heat preservation chamber 6, connecting a motor power supply of a mechanical stirrer assembly, recording initial positions of the transmitting antenna 4, the device to be tested 5 and a stirrer, setting a main transmitting direction of the transmitting antenna 4 or the device to be tested 5, and adjusting a relative position of the device to be tested 5 and the transmitting antenna 4;
step two: the temperature of the heat preservation chamber 6 where the equipment to be tested 5 is located is set through the temperature regulation module 14, and a high-low temperature environment is formed in a local area inside the reverberation chamber 1;
step three: electromagnetic signals are fed into the transmitting antenna 4 through the vector network analyzer 12, the rotating speed of the rotating platform 9 is controlled by the rotating platform control module 13, the stepping and rotating speed of the stirrer are controlled by the motor control module 11, statistical and average electromagnetic field distribution is formed in the reverberation chamber 1, and S parameters among the antennas are measured through the vector network analyzer 12, so that testing work under different working modes is completed.
The invention has the beneficial effects that:
the whole device adopts a step-in type incubator structure, the working temperature of the device to be measured is controlled by the temperature control system, the high-low temperature difference environment in practical application is effectively simulated, and the measurement of the device to be measured at different temperatures is realized; meanwhile, the temperature control method adopted by the invention is independent of the stirring mode and the test type of the reverberation chamber, so that the method can be applied to different types of reverberation chambers, and can be applied to the stirring modes of a frequency stirring reverberation chamber, a source stirring reverberation chamber and the like besides a mechanical stirring reverberation chamber.
According to the invention, the heat preservation chamber formed by six heat preservation plates is additionally arranged in the working area inside the reverberation chamber, the working temperature of the equipment to be measured is regulated by the temperature control system, the high-low temperature difference environment in practical application is effectively simulated, and the measurement of the equipment to be measured at the limit temperature is realized.
Drawings
Fig. 1 is a schematic diagram of a reverberation room testing system with a temperature control system.
FIG. 2 is a schematic view showing the internal structure of the heat-retaining chamber.
Fig. 3 is a block diagram of a reverberation room testing system with a temperature control system.
Fig. 4 shows the total radiated power (TIS) measurements of the device under test at different temperatures.
Fig. 5 is a graph of total isotropic sensitivity (TRP) measurements for devices under test at different temperatures.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A reverberation room testing system with a temperature control system is shown in fig. 1, and its basic structure includes: the device comprises a reverberation room 1, a temperature control system 2, a stirrer component 3, a transmitting antenna 4, equipment to be tested 5, a heat preservation room 6, an air inlet duct 7 and an air return duct 8; the reverberation chamber 1 is a rectangular resonant cavity surrounded by high-reflection metal materials, two mechanical stirrers 3 are installed in the reverberation chamber 1 and respectively located in the vertical direction and the horizontal direction, the stirrers are driven to rotate in a stepping or mechanical rotation driving mode through an external motor, so that the boundary condition of an electromagnetic field is changed, the maximum size of the mechanical stirrers 3 is not less than 75% of the maximum size of the reverberation chamber 1, and the rotating diameter of the stirrers is not less than l/4 of the wavelength of the lowest use frequency.
Selecting a standard loudspeaker as a transmitting antenna 4 and fixing the standard loudspeaker in a reverberation chamber 1 through a bracket, arranging equipment 5 to be tested in a working area of the reverberation chamber 1 after arranging the equipment on a turntable 9 through an antenna bracket, arranging the working area of the reverberation chamber 1 in the working area of the reverberation chamber 1 by surrounding a rectangular heat preservation chamber 6 consisting of six heat preservation and dialysis plates shown in figure 2, wherein the heat preservation and dialysis plates consist of rigid polyurethane foaming heat preservation laminated plates with the thickness of 12cm, the heat preservation chamber 6 is connected with a temperature control system 2 through an air inlet duct 7 and an air return duct 8, the controllable temperature range of the temperature control system 2 is-50 ℃ to +100 ℃, the temperature uniformity of the temperature control system 2 is less than 2 ℃, the temperature deviation is within 2 ℃, air in a heat preservation box body is connected with air in a unit box 16 of the temperature control system 2 by adopting an air supply device and an air pipe, the air is refrigerated and heated by a heat exchanger and a heater in the unit box 16, and then cold air (, realize temperature reduction and temperature rise.
As shown in fig. 3, a block diagram of a testing system of a reverberation chamber 1 with a temperature control system 2 is shown, wherein a transmitting antenna 4 and a device under test 5 are respectively connected to two ports of a vector network analyzer 12, a vertical stirrer and a vertical stirrer are respectively connected to a motor control module 11, a turntable control module 13 is used for setting the position of the antenna, a temperature control module 14 is used for adjusting the temperature in a heat preservation chamber 6, and a computer 10 is used for controlling the rotation of the stirrer, storing S parameters of the antenna and adjusting the rotation of a turntable 9.
The method comprises the following specific implementation steps:
the method comprises the following steps: adjusting a transmitting antenna 4 at a proper position in a reverberation chamber 1, placing a device to be tested 5 on a rotary table 9 in a heat preservation chamber 6, connecting a motor power supply of a mechanical stirrer 3 assembly, recording initial positions of the transmitting antenna 4, the device to be tested 5 and a stirrer, setting a main transmitting direction of the transmitting antenna 4 or the device to be tested 5, and adjusting a relative position of the antenna to be tested and the transmitting antenna 4;
step two: the temperature of the heat preservation chamber 6 where the antenna to be tested is located is set through the temperature regulation module 14, a high-low temperature environment is formed in the working area inside the reverberation chamber 1, and the working temperature requirement of the antenna to be tested is met;
step three: electromagnetic signals are fed into the transmitting antenna 4 through the vector network analyzer 12, the rotating speed of the rotating platform 9 is controlled by the rotating platform control module 13, the stepping and rotating speed of the stirrer are controlled by the motor control module 11, statistical and average electromagnetic field distribution is formed in the reverberation chamber 1, S parameters between the transmitting antenna and the receiving antenna are measured, and testing work under different working modes is completed.
As shown in fig. 4 and 5, under the same conditions, the total radiated power (TIS) and total isotropic sensitivity (TRP) of the device under test at the temperatures of 12 ℃ and 18 ℃ are measured, and the test results of the device under test at different temperatures are slightly different.
The invention considers that an important factor influencing the reliability index of the antenna to be tested is the working temperature of components, compared with the traditional test of the reverberation chamber 1, a heat preservation chamber 6 consisting of a heat preservation dialysis plate is added in the working area inside the reverberation chamber, the working temperature of the equipment to be tested 5 is adjusted through a temperature control system 2, the high-low temperature difference environment in practical application is effectively simulated, and the measurement of the equipment to be tested 5 under different working temperatures is realized, and the temperature control system 2 adopted by the invention can be applied to different types of reverberation chambers 1 according to requirements.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The reverberation room test system with the temperature control system is characterized by comprising a reverberation room (1) and the temperature control system (2), wherein a mechanical stirrer (3), a transmitting antenna (4) and a device to be tested (5) are arranged in the reverberation room (1), and the mechanical stirrer (3) changes the boundary condition of an electromagnetic field through mechanical rotation; the reverberation room (1) is inside to be provided with the workspace, equipment to be measured (5) are placed to the workspace, heat preservation room (6) is arranged in to the workspace, heat preservation room (6) are connected with temperature control system (2) through air inlet duct (7) and return air duct (8).
2. The reverberation room test system with temperature control system of claim 1, wherein the number of the transmitting antennas (4) is different according to the requirement, and the operating frequency of the transmitting antennas (4) is adjusted to reach the matching state according to the test requirement.
3. The reverberation room test system with the temperature control system as set forth in claim 1, wherein a turntable (9) is disposed inside the reverberation room (1), the transmitting antenna (4) and the device under test (5) are selectively disposed on the turntable (9), and the turntable (9) rotates around a vertical rotation axis to test the transmitting antenna (4) and the device under test (5) in multiple directions and positions.
4. A reverberation chamber test system with temperature control system as claimed in claim 1, characterized in that the mechanical stirrer (3) has stepping and rotating capability, the stirrer size matching the lowest resonance frequency of the reverberation chamber (1).
5. The reverberation room test system with the temperature control system according to claim 1, wherein the temperature control system (2) is of a step-in type incubator structure, the temperature control system (2) comprises a unit box, and the unit box is connected with a heat preservation room (6) inside the reverberation room (1) through a pipeline to form a high and low temperature environment in a local volume region inside the reverberation room (1).
6. The reverberation room test system with temperature control system as set forth in claim 1 wherein the heat preservation room (6) is a rectangular parallelepiped structure, and the heat preservation room (6) is composed of six heat preservation transmission plates.
7. The reverberation chamber test system with temperature control system of claim 1, wherein the maximum size of the mechanical stirrer (3) is not less than 75% of the maximum size of the reverberation chamber 1, the stirrer rotating diameter is not less than l/4 of the lowest use frequency wavelength, and the mechanical stirrer (4) comprises a vertical stirrer and a horizontal stirrer.
8. The reverberation room test system with the temperature control system according to claim 1, wherein a motor control module (11), a vector network analyzer (12) and a rotary table control module (13) are arranged on the reverberation room (1), a temperature control module (14) is arranged on the temperature control system (2), and the motor control module (11) is connected with a driving motor (15) on the mechanical stirrer (3); the test port of the vector network analyzer (12) is respectively connected with the transmitting antenna (4) and the test equipment (5); the rotary table control module (13) is connected with a rotary table (9) for placing a transmitting antenna and testing; the motor control module (11), the vector network analyzer (12), the rotary table control module (13) and the temperature control module (14) are respectively connected with the computer (10) through GPIB or USB standard interfaces, and the computer (10) is used for controlling stepping and rotating speed of the mechanical stirrer (3), rotating speed of the rotary table (9), testing frequency and relevant parameters of testing temperature.
9. The method for testing the reverberation room test system with temperature control system as set forth in claim 1, comprising the steps of:
the method comprises the following steps: adjusting a transmitting antenna (4) at a proper position in a reverberation chamber (1), placing a device to be tested (5) on a turntable (9) in a heat preservation chamber (6), connecting a motor power supply of a mechanical stirrer assembly, recording initial positions of the transmitting antenna (4), the device to be tested (5) and a stirrer, setting a main radiation direction of the transmitting antenna (4) or the device to be tested (5), and adjusting a relative position of the device to be tested (5) and the transmitting antenna (4);
step two: the temperature of a heat preservation chamber (6) where the equipment to be tested (5) is located is set through a temperature regulation module (14), and a high-low temperature environment is formed in a local area inside the reverberation chamber 1;
step three: electromagnetic signals are fed into the transmitting antenna (4) through the vector network analyzer (12), the rotating speed of the rotating platform (9) is controlled by the rotating platform control module (13), the stepping and rotating speed of the stirrer are controlled by the motor control module (11), statistical and average electromagnetic field distribution is formed in the reverberation chamber (1), and S parameters among the antennas are measured through the vector network analyzer (12) to finish test work under different working modes.
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Application publication date: 20210601 |
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