Resonant cavity magnetic field sensing system for enhancing DC field sensing precision by wide-temperature-zone AC field

Abstract

The invention provides a resonant cavity magnetic field sensing system for enhancing DC field sensing precision of a wide-temperature-zone AC field, and the system is characterized in that the outputcenter frequency of a laser is locked on the transmission spectrum of a resonant cavity, and a magnetostrictive medium is embedded in the resonant cavity, or the resonant cavity is pasted on the magnetostrictive medium; an alternating magnetic field is arranged on the outer side of the resonant cavity, the change rule of alternating magnetic field signal intensity caused by direct-current magneticfields with different intensities when the wavelength of the laser is locked at the lowest point or the highest point of the transmission spectrum of the resonant cavity is observed, and alternatingmagnetic field enhanced direct-current magnetic field detection is realized; the system has the advantages of wide temperature range, low cost, low power consumption, electromagnetic interference resistance, high-precision direct-current magnetic field detection capability and the like.

Description

technical field [0001] The present invention relates to a resonant cavity magnetic field sensing system with a wide temperature range alternating magnetic field to enhance the sensing accuracy of a DC magnetic field, specifically to a magnetic field sensing system constructed of a giant magnetostrictive material and an optical resonant cavity, which belongs to the optical field. Background technique [0002] As one of many sensors, the magnetic field sensor has the advantage of non-destructive detection. It can not only collect the magnetic field information in the environment, but also measure the information of physical quantities such as current, rotational speed, position and angle that affect the change of the magnetic field. It is used in national defense, aerospace, It has a wide range of applications in automotive electronics, medical care, energy, consumer electronics, industrial control and other fields. The current biomagnetic field detection equipment is expensi...

AI Technical Summary

Problems solved by technology

The current biomagnetic field detection equipment is expensive, and the low-temperature working conditions make it bulky, and it cannot adapt to the needs of different ambient temperatures during detection. For example, deep-sea detection in a low-temperature environment of -70°C cannot guarantee detection due to the influence of temperature. Accuracy, and for example, some application environments with complex magnetic field environments and AC / DC magnetic fields are affected by electromagnetic interference and cannot guarantee stable operation.

Existing ultrasensitive atomic magnetometer devices still fall short of these needs

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