A kind of nuclear magnetic resonance gyroscope optomagnetic modulation detection system and detection method

Abstract

The invention belongs to a nuclear magnetic resonance gyro detection method, and specifically discloses a nuclear magnetic resonance gyro optical-magnetic modulation detection system and a detection method. The axis direction of the Faraday coil coincides with the optical path direction of the detection laser, and the output end of the photodetector is connected to a signal processing system, which drives the Faraday coil. First adjust the frequency of the output signal of the signal generator to be equal to the design frequency of the Faraday coil, and heat the magnetic resonance gas chamber. When the frequency of the output signal is the same as the frequency of the drive signal received by the Faraday coil, confirm that the laser signal has been modulated, and adjust the lock-in amplifier. , so that it is locked on the modulation frequency of the Faraday coil, and then filtered. The method improves the carrier capability of the detection laser and the integrity of the demodulated signal in the subsequent stage, and achieves the purpose of suppressing the low-frequency noise of the gyroscope detection signal.

Description

technical field [0001] The invention belongs to a nuclear magnetic resonance gyroscope detection method, in particular to a detection system and method capable of isolating low-frequency noise interference inside the gyroscope. Background technique [0002] The nuclear magnetic resonance gyroscope is currently the smallest gyroscope that can achieve navigation-level precision. Its high precision, insensitivity to acceleration, stable scale factor, small size and low power consumption are regarded as the development direction of the next generation of navigation-level precision gyroscopes. . The purpose of the nuclear magnetic resonance gyro is to obtain the rotational angular rate of the carrier by detecting the oscillation frequency of the atomic source and subtracting the oscillation frequency of the atomic source itself. Therefore, the high-precision nuclear magnetic resonance gyroscope puts forward higher requirements for its detection system. [0003] At present, the ...

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Problems solved by technology

[0003] At present, the technical solution adopted in the nuclear magnetic resonance gyroscope is still the traditional way of detecting the gyro output by detecting the laser light intensity information, but this detection method is less affected by the laser light intensity, the stability of the optical path, and the low-frequency noise of the detector. Large, it is impossible to effectively isolate these low-frequency interference signals, which reduces the accuracy and stability of the gyro detection system, has a great impact on the stability of the gyro's zero bias, and restricts the further improvement of the gyro's accuracy; and makes the nuclear magnetic resonance gyro high-precision, Theoretical advantages such as insensitivity to acceleration cannot be fully reflected in practical applications

Strict requirements are put forward for the application environment of gyroscopes, which restricts the application range of nuclear magnetic resonance gyroscopes

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