CN111044805B - Electrostatic discharge radio frequency noise test method - Google Patents
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- CN111044805B CN111044805B CN201911376862.3A CN201911376862A CN111044805B CN 111044805 B CN111044805 B CN 111044805B CN 201911376862 A CN201911376862 A CN 201911376862A CN 111044805 B CN111044805 B CN 111044805B
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Abstract
The invention belongs to the technology of airplane electromagnetic environment effect, and provides an electrostatic discharge radio frequency noise testing method, which comprises the following steps: step 1, firstly, placing the test device in a shielding chamber, communicating a variable voltage source with a cup-shaped hollow electrode, and placing an electrostatic discharger in the cup-shaped electrode. Step 2, gradually increasing the voltage of the variable voltage source until the discharger is discharged; the ammeter is used for monitoring the discharge current in the discharge process; and 3, connecting the loop antenna with the spectrum analyzer, receiving the electromagnetic waves in the discharging process by using the loop antenna, converting the electromagnetic wave signals into high-frequency electromagnetic current signals in the discharging process, sending the high-frequency electromagnetic current signals to the spectrum analyzer, and displaying the amplitude of the spectrum analyzer. The invention has simple operation, strong adaptability and high reliability, and can solve the problem of radio frequency noise test.
Description
Technical Field
The invention belongs to the technology of airplane electromagnetic environment effect, and relates to a method for testing radio frequency noise generated by airplane electrostatic discharge.
Background
When the airplane flies at high altitude, the surface of the airplane generates deposited static electricity by friction with the atmosphere, a static amplifier arranged on the airplane is used for stably discharging the deposited static electricity generated on the surface of the airplane body, radio frequency noise generated in the discharging process of the deposited static electricity is received by an antenna on the airplane, and when the intensity of a noise signal exceeds the receiving threshold of a radio receiver, interference is generated on radio equipment. Now, the radio frequency noise of the electrostatic discharge needs to be measured, and the electrostatic discharger needs to be selected to prevent the radio frequency noise generated by the electrostatic discharge from interfering the radio receiver through the antenna.
Disclosure of Invention
The purpose of the invention is as follows: the electrostatic discharge radio frequency noise testing method provided by the invention is simple and convenient to operate, strong in adaptability and high in reliability, and can solve the radio frequency noise testing problem.
The technical scheme is as follows:
an electrostatic discharge radio frequency noise test method comprises the following steps:
step 1, firstly, placing the test device in a shielding chamber, communicating a variable voltage source with a cup-shaped hollow electrode, and placing an electrostatic discharger in the cup-shaped electrode.
Step 2, gradually increasing the voltage of the variable voltage source until the discharger is discharged; the ammeter is used for monitoring the discharge current in the discharge process;
and 3, connecting the loop antenna with the spectrum analyzer, receiving the electromagnetic waves in the discharging process by using the loop antenna, converting the electromagnetic wave signals into high-frequency electromagnetic current signals in the discharging process, sending the high-frequency electromagnetic current signals to the spectrum analyzer, and displaying the amplitude of the spectrum analyzer.
In the whole test process, the cup-shaped hollow electrode, the electrostatic discharger and the loop antenna are arranged in the shielding darkroom, and the cup-shaped electrode is connected with the variable voltage source through the via hole in the shielding darkroom by the power line.
The via hole adopts the measure of preventing electromagnetic leakage.
The upper half part of the cup-shaped electrode adopts a cylinder, the interior of the cup-shaped electrode is a hollow part, and the lower half part of the cup-shaped electrode is in a hemispherical shape; and in the test process, the depth of the electrostatic discharger extending into the cup-shaped electrode is adjusted, and the size of radio frequency noise is observed.
The step 2 specifically comprises the following steps: and gradually increasing discharge, and observing the value change in the frequency spectrum analyzer in real time until the cup-shaped electrode discharges to the electrostatic discharger, wherein in the discharge process, the voltage threshold of the electrostatic discharge can be observed by adopting a variable voltage source, and the discharge thresholds of different electrostatic dischargers can be obtained through experiments.
The adopted variable voltage source can rapidly change the voltage, the maximum voltage of the voltage source is 0-50 kilovolts, the voltage of the voltage source is stepped by 0.1 kilovolt in the test process, and the voltage of the voltage source is gradually increased until the electrostatic discharger is discharged.
The loop antenna adopts a high-frequency cable, passes through the shielding chamber through the via hole and is connected with an external spectrum analyzer, and the via hole adopts anti-electromagnetic leakage measures.
During the test, the normal of the loop antenna is intersected with the center of the cup electrode; and moving the position of the loop antenna, observing the spectrum analyzer, and measuring to obtain the maximum amplitude in the discharging process.
In the experimental process, the loop antennas with different central frequencies are replaced to obtain the radio frequency noise amplitude in the concerned frequency band.
In the test process, a spectrum analyzer is adopted to observe the amplitude of the radio frequency noise, and the frequency range of the spectrum analyzer is 10KHz to 6 GHz; in the experimental process, the center frequency, the video bandwidth and the resolution bandwidth of the spectrum analyzer are adjusted, so that the amplitude distribution of the radio frequency noise on the frequency domain can be detected.
Has the advantages that: the invention can solve the problem of radio frequency noise test and can be widely used for measuring radio frequency noise of various charge discharge. By adopting the cup-shaped electrode, the static discharger extends into the cup-shaped electrode, and stable and reliable discharge of the discharger is realized. The cup-shaped electrode, the electrostatic discharger and the loop antenna are arranged in the shielding chamber, the electromagnetic environment is pure, and tiny radio frequency noise in the discharging process can be accurately measured.
Drawings
FIG. 1 is a block diagram of a radio frequency noise test system according to the present invention.
Detailed Description
The present invention is illustrated by the following design example.
As shown in fig. 1, a method for testing electrostatic discharge radio frequency noise includes:
step 1, firstly, placing the test device in a shielding chamber, communicating a variable voltage source with a cup-shaped hollow electrode, and placing an electrostatic discharger in the cup-shaped electrode.
Step 2, gradually increasing the voltage of the variable voltage source until the discharger is discharged; the ammeter is used for monitoring the discharge current in the discharge process;
and 3, connecting the loop antenna with the spectrum analyzer, receiving the electromagnetic waves in the discharging process by using the loop antenna, converting the electromagnetic wave signals into high-frequency electromagnetic current signals in the discharging process, sending the high-frequency electromagnetic current signals to the spectrum analyzer, and displaying the amplitude of the spectrum analyzer.
In the whole test process, the cup-shaped hollow electrode, the electrostatic discharger and the loop antenna are arranged in the shielding darkroom, and the cup-shaped electrode is connected with the variable voltage source through the via hole in the shielding darkroom by the power line. The via hole adopts the measure of preventing electromagnetic leakage.
The upper half part of the cup-shaped electrode adopts a cylinder, the interior of the cup-shaped electrode is a hollow part, and the lower half part of the cup-shaped electrode is in a hemispherical shape; and in the test process, the depth of the electrostatic discharger extending into the cup-shaped electrode is adjusted, and the size of radio frequency noise is observed.
The step 2 specifically comprises the following steps: and gradually increasing discharge, and observing the value change in the frequency spectrum analyzer in real time until the cup-shaped electrode discharges to the electrostatic discharger, wherein in the discharge process, the voltage threshold of the electrostatic discharge can be observed by adopting a variable voltage source, and the discharge thresholds of different electrostatic dischargers can be obtained through experiments.
The adopted variable voltage source can rapidly change the voltage, the maximum voltage of the voltage source is 0-50 kilovolts, the voltage of the voltage source is stepped by 0.1 kilovolt in the test process, and the voltage of the voltage source is gradually increased until the electrostatic discharger is discharged.
The ammeter has a range of 10 amperes. And recording the magnitude of the transient discharge current in real time in the discharge process by adopting an ammeter.
The loop antenna adopts a high-frequency cable, passes through the shielding chamber through the via hole and is connected with an external spectrum analyzer, and the via hole adopts anti-electromagnetic leakage measures.
During the test, the normal of the loop antenna is intersected with the center of the cup electrode; and moving the position of the loop antenna, observing the spectrum analyzer, and measuring to obtain the maximum amplitude in the discharging process.
The method has the advantages that the electrostatic discharge time is short, the frequency band of the generated electromagnetic radiation is wide, the energy is mainly concentrated within hundred megahertz, and the volume of the loop antenna adopted by the method is small, so that the radio frequency noise in the frequency band can be conveniently received.
In the experimental process, the loop antennas with different central frequencies are replaced to obtain the radio frequency noise amplitude in the concerned frequency band.
In the test process, a spectrum analyzer is adopted to observe the amplitude of the radio frequency noise, and the frequency range of the spectrum analyzer is 10KHz to 6 GHz. In the experimental process, the center frequency, the video bandwidth and the resolution bandwidth of the spectrum analyzer are adjusted, so that the amplitude distribution of the radio frequency noise on the frequency domain can be detected.
Claims (9)
1. An electrostatic discharge radio frequency noise test method is characterized by comprising the following steps:
step 1, firstly, placing a test device in a shielding chamber, wherein a variable voltage source is communicated with a cup-shaped hollow electrode, and a static discharger is placed in the cup-shaped electrode;
step 2, gradually increasing the voltage of the variable voltage source until the electrostatic discharger is discharged; the ammeter is used for monitoring the discharge current in the discharge process;
step 3, connecting the loop antenna with a spectrum analyzer, receiving the electromagnetic waves in the discharging process by using the loop antenna, converting the electromagnetic wave signals into high-frequency electromagnetic flow signals in the discharging process, sending the high-frequency electromagnetic flow signals to the spectrum analyzer, and displaying the amplitude of the spectrum analyzer;
the upper half part of the cup-shaped electrode adopts a cylinder, the interior of the cup-shaped electrode is a hollow part, and the lower half part of the cup-shaped electrode is in a hemispherical shape; and in the test process, the depth of the electrostatic discharger extending into the cup-shaped electrode is adjusted, and the size of radio frequency noise is observed.
2. The method of claim 1, wherein the ESD RF noise test method,
in the whole test process, the cup-shaped hollow electrode, the electrostatic discharger and the loop antenna are arranged in the shielding darkroom, and the cup-shaped electrode is connected with the variable voltage source through the via hole in the shielding darkroom by the power line.
3. The ESD RF noise test method according to claim 2,
the via hole adopts the measure of preventing electromagnetic leakage.
4. The method of claim 1, wherein the ESD RF noise test method,
the step 2 specifically comprises the following steps: and gradually increasing discharge, and observing the value change in the frequency spectrum analyzer in real time until the cup-shaped electrode discharges to the electrostatic discharger, wherein in the discharge process, the voltage threshold of the electrostatic discharge can be observed by adopting a variable voltage source, and the discharge thresholds of different electrostatic dischargers can be obtained through experiments.
5. The method of claim 1, wherein the ESD RF noise test method,
the adopted variable voltage source can rapidly change the voltage, the maximum voltage of the voltage source is 0-50 kilovolts, the voltage of the voltage source is stepped by 0.1 kilovolt in the test process, and the voltage of the voltage source is gradually increased until the electrostatic discharger is discharged.
6. The method of claim 1, wherein the ESD RF noise test method,
the loop antenna adopts a high-frequency cable, passes through the shielding chamber through the via hole and is connected with an external spectrum analyzer, and the via hole adopts anti-electromagnetic leakage measures.
7. The method of claim 1, wherein the ESD RF noise test method,
during the test, the normal of the loop antenna is intersected with the center of the cup electrode; and moving the position of the loop antenna, observing the spectrum analyzer, and measuring to obtain the maximum amplitude in the discharging process.
8. The ESD RF noise test method according to claim 7,
in the experimental process, the loop antennas with different central frequencies are replaced to obtain the radio frequency noise amplitude in the concerned frequency band.
9. The method of claim 1, wherein the ESD RF noise test method,
in the test process, a spectrum analyzer is adopted to observe the amplitude of the radio frequency noise, and the frequency range of the spectrum analyzer is 10KHz to 6 GHz; in the experimental process, the center frequency, the video bandwidth and the resolution bandwidth of the spectrum analyzer are adjusted, so that the amplitude distribution of the radio frequency noise on the frequency domain can be detected.
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| CN114509652B (en) * | 2022-04-19 | 2022-06-21 | 合肥航太电物理技术有限公司 | Device and method for testing radio frequency discharge noise of aircraft electrostatic discharger |
| CN116930665A (en) * | 2023-09-13 | 2023-10-24 | 合肥航太电物理技术有限公司 | Airplane electrostatic discharge radio frequency noise testing equipment and method |
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