Difference method for improving sensitivity and absolute precision of CPT (Coherent Population Trapping) atom magnetometer

An atomic magnetometer and absolute precision technology, applied in the direction of the size/direction of the magnetic field, magnetic field measurement using magneto-optical equipment, etc., can solve the problems that high sensitivity and high absolute precision cannot be guaranteed at the same time, so as to improve sensitivity and absolute precision Accuracy, simple operation effect

Inactive Publication Date: 2014-04-23
ZHEJIANG UNIV +1
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Problems solved by technology

[0003] In order to overcome the problem that the existing atomic magnetometer cannot guarantee high sensitivity and high absolute precision at the same...

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  • Difference method for improving sensitivity and absolute precision of CPT (Coherent Population Trapping) atom magnetometer
  • Difference method for improving sensitivity and absolute precision of CPT (Coherent Population Trapping) atom magnetometer
  • Difference method for improving sensitivity and absolute precision of CPT (Coherent Population Trapping) atom magnetometer

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Embodiment Construction

[0033] The present invention is further analyzed below in conjunction with accompanying drawing.

[0034] Under the magnetic field to be measured, the atomic energy level of the alkali metal will split, and the splitting situation is related to the size of the magnetic field to be measured. When a beam of circularly polarized laser light passes through an alkali metal atom gas, if the laser frequency completely resonates with the ground state energy level of the split alkali metal atom, the alkali metal atom has the lowest absorption rate of the laser, and the relationship between the transmitted light intensity and the laser frequency can be obtained The size of the magnetic field to be measured. Affected by non-magnetic field factors, under the same magnetic field to be measured, the relationship between the transmitted light intensity measured by two orthogonally polarized circularly polarized lights and the laser frequency is different. If the two signals are differentiate...

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Abstract

The invention discloses a difference method for improving the sensitivity and the absolute precision of a CPT (Coherent Population Trapping) atom magnetometer. The method comprises the following steps: putting a low-intensity magnetic field probe in a magnetic field to be detected at a constant temperature; adjusting a laser control circuit to keep the laser wavelength stable and keep resonance of the laser wavelength and alkali metal atomic ground state level; vertically putting a half-wave plate and a polarization beam splitter prism in laser, and adjusting the polarization angle of the optical axis of the half-wave plate and the laser; enabling a quarter-wave plate to be vertical to two beams of parallel laser; adjusting the polarization angle of the optical axis of the quarter-wave plate and the laser, wherein the polarization of the parallel laser becomes left-hand circular polarization and right-hand circular polarization respectively; carrying out laser detection on the left-hand circular polarization and the right-hand circular polarization by two photovoltaic conversion devices, and subtracting obtained light intensity values by a subtracter, wherein the magnetic induction intensity B of the magnetic field to be detected is obtained through acquisition and signal processing of data acquisition and processing equipment. The difference method has the advantages of easy operation, high sensitivity and high precision.

Description

technical field [0001] The invention belongs to the field of magnetic field measurement technology, and relates to a differential method for improving the sensitivity and absolute precision of a CPT atomic magnetometer, which is used to improve the sensitivity and absolute precision of a CPT (Coherent Population Trapping) atomic magnetometer. Background technique [0002] In modern technology, the detection of weak magnetic fields is a very important technology. At present, the atomic magnetometer is one of the main weak magnetic field detection instruments. Absolute accuracy, but the sensitivity is low, and the sensitivity and absolute accuracy performance of the magnetometer cannot be guaranteed at the same time. In the existing technology applied to the atomic magnetometer, there is no technical method that can improve the sensitivity and absolute accuracy at the same time. The traditional differential method can only improve the atomic magnetic force due to the subtract...

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Application Information

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IPC IPC(8): G01R33/032
Inventor 梁尚清杨国卿徐云飞林强
Owner ZHEJIANG UNIV
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