Scalar atomic magnetometer closed-loop control system and method based on in-phase excitation

Abstract

The invention relates to the technical field of magnetic detection, and discloses a scalar atom magnetometer closed-loop control system and method based on in-phase excitation. The system includes: the detection light source generates detection light; the atomic gas chamber is filled with a medium for sensitive angular velocity; the driving light source generates driving light; the direction of the excitation coil is the same as that of the detection light passing through the atomic gas chamber; the direct digital frequency synthesizer outputs the excitation signal The drive coil generates an in-phase excitation magnetic field; the polarization beam splitter divides the detected light into two polarized lights in different directions; the first detector and the second detector detect the two polarized lights in different directions; the subtractor detects the two output signals Perform subtraction; the multiplier multiplies the output signal of the subtractor and the excitation signal; the filter filters the output signal of the multiplier; the accumulator accumulates and averages the output signal of the filter and outputs the accumulated and averaged signal to the frequency synthesizer for excitation signal for feedback regulation. This increases the sensitivity and stability of the magnetometer.

Description

technical field [0001] The invention relates to the technical field of magnetic detection, in particular to a scalar atom magnetometer closed-loop control system and method based on in-phase excitation. Background technique [0002] Magnetic anomaly detection is a technology that uses magnetic anomaly information to detect and identify magnetic objects by measuring the disturbance of the earth's magnetic field lines caused by magnetic objects. It has the advantages of high positioning accuracy, pure passive detection, and good environmental adaptability. , underwater target recognition and other fields have been widely used. The scalar atomic magnetometer has outstanding advantages such as high sensitivity, small size, and insensitivity to attitude. It is especially suitable for marine resource exploration, underwater target magnetic anomaly detection and other fields. Taking magnetic anomaly detection as an example, atomic magnetometers are required to have high sensitivit...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a scalar atomic magnetometer closed-loop control system and method based on in-phase excitation, which can solve the problem that the sensitivity and stability of the magnetometer in the prior art are affected

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