Remote on-line calibration method for magnetic sensor

Abstract

The invention relates to a remote on-line calibration method for a magnetic sensor, which comprises the following steps: sending a calibrated instruction to a calibration site through Internet in the mode of e-mail; after an on-site control computer receives the e-mail, sending a control command to a bottom layer sine wave circuit; controlling the CPU of the circuit to determine and calibrate parameters such as frequency points, channels and the like according to the instruction; starting a waveform generation function; sending a calibrated signal and a sensing signal which is generated from the magnetic sensor to a calibrator; and after collection, compressing the signals by the control computer at the calibration site and then forwarding to a mailbox to finish the remote on-line calibration of the magnetic sensor. The method has simple step and is reliable, and the remote on-line calibration of the magnetic sensor can be realized without disassembling the magnetic sensor and then carrying back to a laboratory or carrying bulk calibration equipment to the site to calibrate.

Description

technical field [0001] The invention relates to a remote online calibration technology, in particular to a remote online calibration method for a magnetic sensor. Background technique [0002] The magnetic sensor of the magnetic field measuring instrument is composed of a high magnetic permeability magnetic core and a metal coil wound on it. It uses the principle of Faraday electromagnetic induction to measure the external magnetic field signal. However, as the use time becomes longer, the permeability of the magnetic core material The magnetic rate will change, affecting the test accuracy of the instrument. Therefore, the magnetic sensor must be calibrated regularly. At present, the magnetic sensor is mainly calibrated by Helmholtz coils. The Helmholtz coils are composed of two circular coils with the same radius and the same number of turns, parallel to each other, and coaxially placed in series in the same direction. The distance between them is equal to their radius; t...

AI Technical Summary

Problems solved by technology

Its disadvantages are: because the Helmholtz coil occupies a large area and is inconvenient to transport, most of the current magnetic sensors are placed in the field and buried in the ground. If re-calibration is required, it must be disassembled and transported back to the laboratory or carry large-scale calibration equipment. to the scene

This method makes the calibration work complicated and easily damages the magnetic sensor

So far, there is no literature report on the remote online calibration technology of magnetic sensors, and the remote online calibration function cannot be realized in the monitoring center.

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