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

A sensing system and resonant cavity technology, applied in the field of optics, can solve the problems of bulky, high cost, and inability to guarantee detection accuracy, and achieve the effects of easy integration, small size, and high sensing sensitivity

Active Publication Date: 2020-06-12
HANGZHOU DIANZI UNIV
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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 ...

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

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specific Embodiment approach 1

[0017] Specific implementation mode one: as figure 1 As shown, the system realized by the PDH frequency stabilization system is:

[0018] Including coil 0, fiber laser 1, isolator 2, first polarization controller 3, electro-optic modulator 4, first fiber taper 5, resonant cavity 6, magnetostrictive medium 7, photodetector 8, bias tee 9 , high-pass filter 10, first beam splitter 11, mixer 12, signal generator 13, spectrometer 14, oscilloscope 15, control box 16, voltage amplifier 17, second polarization controller 18, second fiber taper 19 , the second beam splitter 20;

[0019] The light output by the fiber laser 1 passes through the optical isolator 2, the first polarization controller 3, the electro-optic modulator 4 and the second polarization controller 18 in sequence, and then couples the light into the resonant cavity 6 through the first fiber taper 5 , the output of the light field in the cavity passes through the second light cone 19 to the receiving end of the photo...

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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...

Claims

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Application Information

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IPC IPC(8): G01R33/032
CPCG01R33/032
Inventor 项晨晨于长秋王宏腾周铁军李海骆泳铭
Owner HANGZHOU DIANZI UNIV
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