Three-dimensional coil coefficient calibration method based on optical pump nuclear magnetic resonance

Abstract

The invention relates to a three-dimensional coil coefficient calibration method based on optical pump nuclear magnetic resonance. According to the method,an atomic glass gas chamber filled with cesium atoms and buffer gas is placed in the center of a three-dimensional coil; current is respectively applied to the coil in any one or two directions in the three-dimensional coil, a direct-current magnetic field is generated; the atomic gas chamber is irradiated through left-hand circularly polarized light, the irradiation direction of the circularly polarized light and the applied direct-current magnetic field are in the same plane, meanwhile, a radio-frequency magnetic field with a fixed frequency is applied in the direction perpendicular to the plane of the direct-current magnetic field and the circularly polarized light; an optical pump nuclear magnetic resonance state is achieved by adjusting the magnitude of current, and at the moment, light penetrating through the atom air chamber is subjected to maximum modulation of the cesium atoms; the amplitude of emergent light is obtained after the emergent light is subjected to photoelectric conversion and demodulation; and coil coefficient calibration is achieved when a current value corresponding to the maximum amplitude is obtained. The method has the advantages of high precision, avoidance of use of other magnetic field measuring instruments, simplicity in operation and good universality, and can be conveniently applied to coil coefficient measurement of the three-dimensional coil of a nuclear magnetic resonance gyroscope.

Description

technical field [0001] The invention relates to a technology in the field of nuclear magnetic resonance, in particular to a three-dimensional coil coefficient calibration method based on optical pump nuclear magnetic resonance. Background technique [0002] The nuclear magnetic resonance gyroscope has broad application prospects in aviation, aerospace, navigation, transportation and other fields. The performance index of the three-dimensional coil as the core component has a great influence on the detection accuracy of the nuclear magnetic resonance gyroscope, but the three-dimensional coil of the nuclear magnetic resonance gyroscope is small in size. Special-shaped coils are difficult to calibrate through conventional methods. Existing technologies include the use of miniature three-axis fluxgates, nuclear magnetic resonance calibration, and coil calibration based on SERF magnetometers. Due to the small size of the coil, the magnetometer probe cannot be placed in the center...

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Problems solved by technology

[0002] The nuclear magnetic resonance gyroscope has broad application prospects in aviation, aerospace, navigation, transportation and other fields. The performance index of the three-dimensional coil as the core component has a great influence on the detection accuracy of the nuclear magnetic resonance gyroscope, but the three-dimensional coil of the nuclear magnetic resonance gyroscope is small in size. Special-shaped coils are difficult to calibrate by conventional methods

Existing technologies include the use of miniature three-axis fluxgates, nuclear magnetic resonance calibration, and coil calibration based on SERF magnetometers. Due to the small size of the coil, the magnetometer probe cannot be placed in the center of the coil due to its size and shape. This will lead to a large calibration error accuracy, which cannot be applied to the calibration of the three-dimensional coil of the nuclear magnetic resonance gyroscope

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