CN113341351A - Omnidirectional magnetic induction intensity testing instrument calibration and time-frequency testing method and device - Google Patents
Omnidirectional magnetic induction intensity testing instrument calibration and time-frequency testing method and device Download PDFInfo
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- CN113341351A CN113341351A CN202110640883.2A CN202110640883A CN113341351A CN 113341351 A CN113341351 A CN 113341351A CN 202110640883 A CN202110640883 A CN 202110640883A CN 113341351 A CN113341351 A CN 113341351A
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Abstract
The invention discloses a method and a device for calibrating an omnidirectional magnetic induction intensity testing instrument and testing time frequency, which relate to the technical field of electric field testing and comprise the following steps: obtaining the average value of magnetic induction intensity RMS within the time length T1 of the preset stable sine alternating magnetic field
And X, Y, Z three-directional magnetic induction voltage signals; x, Y, Z calculating three groups of sine signal vectors and voltage RMS average value in the same period
And is compared with the RMS average value of the magnetic induction
Constructing a linear regression equation to obtain a slope and an intercept, and completing calibration as a voltage signal and actual magnetic induction conversion formula; any real-time voltage time domain signal is obtained again, and the real-time voltage time domain signal can be converted into a real-time magnetic induction intensity value; and processing the real-time domain magnetic induction intensity value according to a fast Fourier algorithm to obtain a frequency domain signal. This application has the effect that reduces equipment cost improves the magnetic induction intensity test means.
Description
Technical Field
The application relates to the technical field of electric field testing, in particular to a method and a device for calibrating an omnidirectional magnetic induction intensity testing instrument and testing time frequency.
Background
When the GB/T37130-; as the standard is just started, corresponding testing equipment is lacked in China or the accuracy of the domestic equipment is insufficient, equipment (such as ELT-400) of Narda company in Germany is often used for testing, but the equipment can only carry out time domain testing, displays RMS mean value/peak value within 1 second at the frequency of 4Hz, and cannot carry out frequency domain testing required by GB/T37130-.
Disclosure of Invention
In order to better test the exposure of the electromagnetic field of the vehicle relative to the human body, the application provides a method and a device for calibrating an omnidirectional magnetic induction intensity test instrument and testing time frequency.
In a first aspect, the present application provides a method for calibrating an omnidirectional magnetic induction intensity test instrument and performing a time-frequency test, which adopts the following technical scheme:
a method for calibrating an omnidirectional magnetic induction intensity testing instrument and testing time frequency comprises the following steps:
obtaining the average value of magnetic induction intensity RMS within the time length T1 of the preset stable sine alternating magnetic field
And X, Y, Z three-directional magnetic induction voltage signals;
x, Y, Z calculating three groups of sine signal vectors and voltage RMS average value in the same period
And is compared with the RMS average value of the magnetic induction
Constructing a linear regression equation to obtain a slope and an intercept, and completing calibration as a voltage signal and actual magnetic induction conversion formula;
acquiring any real-time voltage time domain signal again, namely acquiring a real-time domain magnetic induction intensity value again; and the number of the first and second groups,
processing the real-time domain magnetic induction intensity value according to a fast Fourier algorithm to obtain a frequency domain signal;
wherein the real-time domain magnetic induction intensity values are: and the voltage time domain real-time signal is obtained by processing according to the calibrated slope, the calibrated intercept and the linear regression equation.
Optionally, the steady sinusoidal alternating magnetic field is generated by a uniform magnetic field generator.
Optionally, the RMS average value of the magnetic induction over the period of T1
And X, Y, Z the magnetic induction voltage signals in three directions are: the magnetic field is obtained by an omnidirectional magnetic field probe of a magnetic induction intensity testing instrument, processed and output by a host machine of the magnetic induction intensity testing instrument and obtained by analog/digital conversion.
Optionally, the linear regression equation is
In a second aspect, the present application provides a time-frequency testing apparatus, which adopts the following technical scheme:
a time-frequency testing device comprises a memory and a processor, wherein the memory is stored with a computer program which can be loaded by the processor and executes the method.
In summary, the present application includes at least one of the following beneficial technical effects:
based on a magnetic induction intensity testing instrument which can only test a time domain, the correct RMS average value of the magnetic induction intensity within a period of time and an electric signal corresponding to X, Y, Z three-direction magnetic induction intensity are obtained, so that the magnetic induction intensity time-frequency test can be realized, the equipment cost is reduced, and the magnetic induction intensity testing means is improved.
Drawings
Fig. 1 is a schematic flow diagram of the present application.
Detailed Description
The present application is described in further detail below with reference to fig. 1.
The embodiment of the application discloses a method for calibrating an omnidirectional magnetic induction intensity testing instrument and testing time frequency, which comprises the following steps:
obtaining the average value of magnetic induction intensity RMS within the time length T1 of the preset stable sine alternating magnetic field
And X, Y, Z three-directional magnetic induction voltage signals;
x, Y, Z calculating three groups of sine signal vectors and voltage RMS average value in the same period
And is compared with the RMS average value of the magnetic induction
Constructing a linear regression equation to obtain a slope and an intercept, and completing calibration as a voltage signal and actual magnetic induction conversion formula;
acquiring any real-time voltage time domain signal again, namely acquiring a real-time domain magnetic induction intensity value again; processing the real-time domain magnetic induction intensity value according to a fast Fourier algorithm to obtain a frequency domain signal; wherein the real-time domain magnetic induction intensity values are: and the voltage time domain real-time signal is obtained by processing according to the calibrated slope, the calibrated intercept and the linear regression equation.
The method can be realized by an upper computer, and specifically comprises the following steps:
s1, generating a stable sinusoidal alternating magnetic field by using a uniform magnetic field generator (such as a Helmholtz coil);
s2, reading magnetic induction intensity by using an omnidirectional magnetic field probe in an omnidirectional magnetic induction intensity testing instrument (such as ELT-400) and outputting the magnetic induction intensity to a matched host;
s3, displaying the RMS average value of the magnetic induction intensity in 1 second (T1 duration) by the host computer
And outputting X, Y, Z three-direction magnetic induction intensity electric signals;
wherein, the voltage signal in the X direction is: u shapeX＝(UX_1，UX_2，……，UX_n) The Y-direction voltage signal is: u shapeY＝(UY_1，UY_2，......，UY_n) The Z-direction voltage signal is: u shapeZ＝(UZ_1，UZ_2，......，UZ_n) N is the data volume;
converting the analog electric signal into a digital signal by adopting an analog-to-digital converter or an oscilloscope and transmitting the digital signal to an upper computer;
s4, calculating X, Y, Z three groups of sinusoidal signal vectors and RMS average in the same period
The calculation result of the upper computer and the display value of the host computer
Constructing a linear regression equation, wherein the obtained slope (k) and intercept (b) are conversion coefficients of the voltage signal and the actual magnetic induction intensity, thereby completing calibration; wherein the linear regression equation is
And S5, reading the time domain voltage value by using the omnidirectional magnetic field probe, converting the time domain voltage value into a time domain magnetic induction intensity value through a host computer of the omnidirectional magnetic field probe, and converting the time domain magnetic induction intensity value into a frequency domain signal through a fast Fourier algorithm, thereby completing the time-frequency test of the magnetic induction intensity.
Specifically, taking as an example that the frequency of the current supplied to the helmholtz coil is 50Hz, and the X, Y, Z three-direction voltage signals are all in phase:
sine function of voltage in X direction is UX＝Umax_Xsin(100πt)；
Sine function of voltage in Y direction is UY＝Umax_Ysin(100πt)；
Z-direction voltage sine function is UZ＝Umax_Zsin(100πt)；
The voltage RMS average is obtained by the following equation:
and the results in the data sheet were obtained:
The technical scheme can be used for human body protection test of the power supply magnetic field, and meanwhile, the test efficiency is greatly improved.
The embodiment of the application also discloses a time frequency testing device. The time-frequency testing device comprises a memory and a processor, wherein the memory stores a computer program which can be loaded by the processor and executes the method.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (6)
1. A method for calibrating an omnidirectional magnetic induction intensity testing instrument and testing time frequency is characterized by comprising the following steps:
obtaining the average value of magnetic induction intensity RMS within the time length T1 of the preset stable sine alternating magnetic field
And X, Y, Z three-directional magnetic induction voltage signals;
x, Y, Z calculating three groups of sine signal vectors and voltage RMS average value in the same period
And is compared with the RMS average value of the magnetic induction
Constructing a linear regression equation to obtain a slope and an intercept, and completing calibration as a voltage signal and actual magnetic induction conversion formula;
obtaining any real-time voltage time domain signal again, namely obtaining a real-time domain magnetic induction intensity value; and the number of the first and second groups,
processing the real-time domain magnetic induction intensity value according to a fast Fourier algorithm to obtain a frequency domain signal; wherein the real-time domain magnetic induction intensity values are: and the voltage time domain real-time signal is obtained by processing according to the calibrated slope, the calibrated intercept and the linear regression equation.
2. The omnidirectional magnetic induction test instrument calibration and time-frequency test method according to claim 1, wherein: the stable sinusoidal alternating magnetic field is generated by a uniform magnetic field generator.
3. The omnidirectional magnetic induction test instrument calibration and time-frequency test method according to claim 2, wherein: the uniform magnetic field generator is a Helmholtz coil.
4. The omnidirectional magnetic induction test instrument calibration and time-frequency test method according to claim 1, wherein: RMS average value of magnetic induction over the time period of T1
And X, Y, Z the magnetic induction voltage signals in three directions are: the magnetic field is obtained by an omnidirectional magnetic field probe of a magnetic induction intensity testing instrument, processed and output by a host machine of the magnetic induction intensity testing instrument and obtained by analog/digital conversion.
5. The omnidirectional magnetic induction test instrument calibration and time-frequency test method according to claim 1, wherein: the linear regression equation is
6. A time-frequency testing apparatus comprising a memory and a processor, the memory having stored thereon a computer program which is loadable by the processor and adapted to perform the method of any of claims 1 to 5.
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