Self-excited atomic magnetic sensor with liquid crystal phase compensation and magnetic field measurement method

Abstract

The invention discloses a self-excited atomic magnetic sensor for liquid crystal phase compensation and a magnetic field measurement method, which are used for a magnetometer. The self-excited atomicmagnetic sensor comprises a pumping light path perpendicular to the direction of the magnetic field, a probe light path along the direction of the magnetic field, and a circuit closed loop. The pumping light path sequentially comprises an atomic air chamber, a first polarizer, an acousto-optic modulator, and a laser. The probe light path sequentially comprises a photoelectric detector, an atomic air chamber in the pumping light path, a second wave plate1 / 4, a liquid crystal, a first wave plate1 / 4, a second polarizer, and a laser. The closed loop portion of the circuit comprises a photoelectricdetector, an amplifying comparator, a power driver, an acousto-optic modulator, and a counter. According to the liquid crystal phase compensation scheme, a phase shift caused by a circuit coil can beavoided, a phase shift of a larger range magnetic field can be achieved, and the problem that the circuit is unfavorable in the phase shift is solved by combining a light intensity modulation magnetometer and a self-excited magnetometer, the response speed is high, the liquid crystal phase compensation scheme is suitable for the various atomics, and the application value is high.

Description

technical field [0001] The invention relates to the technical field of optical pump magnetometers, in particular to a liquid crystal phase-compensated self-excited atomic magnetic sensor, an atomic magnetic sensor suitable for each atom under the condition of a geomagnetic field, and a method for measuring a magnetic field by using the atomic magnetic sensor. Background technique [0002] Magnetometer is a general term for magnetic field measuring instruments. High-sensitivity magnetic field measurement technology has extensive and important applications in biomedicine, geophysics, space exploration, military and national defense and other fields. At present, there is a significant difference in the research level of magnetometry at home and abroad, and the advanced level of magnetometers abroad has far surpassed our country in terms of sensitivity indicators. Therefore, it is of strategic significance to independently develop a high-sensitivity magnetometer. The optically...

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Problems solved by technology

[0007] In order to solve the above-mentioned deficiencies in the prior art, the present invention proposes a self-excited atomic magnetic sensor with liquid crystal phase compensation and a method for measuring a magnetic field using the self-excited atomic magnetic sensor, and designs a liquid crystal phase compensation scheme that combines light intensity modulation The advantages of magnetometer and self-excited magnetometer avoid the phase shift caused by the circuit coil and realize the phase shift of a wider range of magnetic fields, which can solve the unfavorable problems in the circuit phase shift. The magnetometer responds quickly and is suitable for various atoms. , has wider application value

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