Signal injection calibration method of integral pulse magnetic field measurement system

A measurement system and pulsed magnetic field technology, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve problems affecting the health of operators, avoid pulsed magnetic field exposure and electric shock risks, ensure personal safety, and low cost Effect

Inactive Publication Date: 2015-08-26
PLA UNIV OF SCI & TECH
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Problems solved by technology

The pulsed magnetic field will produce some biological effects on the human body, so the frequent use of the pulsed magnetic field source will affect the health of the operator

Method used

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  • Signal injection calibration method of integral pulse magnetic field measurement system
  • Signal injection calibration method of integral pulse magnetic field measurement system
  • Signal injection calibration method of integral pulse magnetic field measurement system

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Embodiment 1

[0024] The principle of using a magnetic field loop antenna to measure a pulsed magnetic field is based on Faraday's law of electromagnetic induction. The equivalent circuit of the magnetic field measurement antenna is as figure 1 shown. figure 1 middle, e ( t ), L a , R L , U L Represent pulse magnetic field induced voltage, loop antenna inductance, loop antenna load, load R L on the voltage. Calculate the induced voltage of the pulsed magnetic field as formula (1):

[0025] the (1)

[0026] In formula (1) is the magnetic flux passing through the magnetic field looplet antenna, B is the magnetic induction, A is the area of ​​the loop antenna, n is the number of turns of the small loop antenna, θ is the angle between the polarization direction of the magnetic field and the axis of the loop antenna.

[0027] Perform Fourier transform on formula (1) to get

[0028] the (2)

[0029] Depend on figure 1 The eq...

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Abstract

The invention provides a signal injection calibration method of an integral pulse magnetic field measurement system. The method includes the following steps that: 1) an external-connection magnetic field loop antenna of the integral pulse magnetic field measurement system is removed, and the area of the magnetic field loop antenna is measured; 2) sine wave signal small-signals of a certain fixed frequency are injected into the input end of the pulse magnetic field measurement system of which the magnetic field loop antenna is removed, and sine wave signal small-signals of the same frequency can be obtained at the output end of the system, and an oscilloscope is adopted to measure the injected sinusoidal signals and the outputted sinusoidal signals simultaneously; 3) the characteristic coefficient of the integral pulse magnetic field measurement system is calculated according to the amplitudes and frequencies of the injected signals and the outputted signals; 4) the measurement coefficient of the magnetic field measurement system is calculated according to the number of the turns of the magnetic field measurement loop antenna, the area of the magnetic field measurement loop antenna, and the characteristic coefficient of the integral pulse magnetic field measurement system. The signal injection calibration method of the integral pulse magnetic field measurement system of the invention has the advantages of low cost and convenient operation and easy operation, and can assist in preventing calibration personnel from being exposed to pulse magnetic field irradiation and electric shock risks, and can assist in ensuring personal safety.

Description

technical field [0001] The invention belongs to the field of pulse magnetic field measurement, in particular to a measurement coefficient calibration method of an integral type pulse magnetic field measurement system. Background technique [0002] With the development of electronic technology, electromagnetic compatibility issues have become important in all walks of life. Lightning electromagnetic pulses and various pulse discharge processes all involve the measurement of pulsed magnetic fields. Pulsed magnetic field measurement is a difficult problem in electromagnetic compatibility measurement. Pulsed magnetic field measurements can be made with giant magnetoresistance (GMR) sensors. However, the giant magnetoresistive sensor has low sensitivity. If the measured pulse magnetic field is too weak, the signal-to-noise ratio will be reduced after the signal is amplified. The pulsed magnetic field can also be measured by an optical fiber sensor, but the optical fiber sensor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
Inventor 李炎新高成邱实杨波张琪么梅利孙晨鸣裴高飞
Owner PLA UNIV OF SCI & TECH
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