A time-sharing laser frequency stabilization system and method for nuclear magnetic resonance gyroscope

Abstract

The invention relates to a time sharing laser frequency stabilizing system used for a nuclear magnetic resonance gyroscope, and a method thereof. The frequency of a laser device can be coarsely adjusted through temperature control by TEC for driving the laser device. A fedback laser device current is obtained through minimally modulating the driving current of the laser device and through carrying out signal processing by using a photoelectric detector to receive an optical signal of the laser device going through the gyroscope in order to realize accurate frequency control. The nuclear magnetic resonance gyroscope works at a high temperature, a PWM pulse generator is used to generate a heating signal in order to control the temperature of the gyroscope, and the heating signal influences the laser signal to decrease the frequency, the stability and the precision, so a period of non-heating time is additionally delayed after generation of a heating pulse signal. Temperature control of the nuclear magnetic resonance gyroscope is carried out in the heating signal time quantum, and laser frequency stabilizing control of thenuclear magnetic resonance gyroscope is carried out in the non-heating time quantum. The method can avoid affection of the frequency stabilization precision of laser due to influences of a magnetic field generated due to the heating signal on the output result of the photoelectric detector.

Description

technical field [0001] The invention relates to the field of laser frequency stabilization of nuclear magnetic resonance gyroscopes. In particular, a system and method for reducing the influence of the heating magnetic field on the precision of laser frequency stabilization. Background technique [0002] Miniature NMR gyroscopes have the characteristics of small size, low power consumption, high performance, and large dynamic range, and have become the research focus and hotspot of new inertial devices. The performance of NMR gyroscopes is affected by the macroscopic magnetic moment of nuclear spins and is directly related to the density of polarized alkali atoms. The frequency stability of the laser directly affects the density of the polarized alkali metal atoms. If the laser frequency fluctuates greatly, the polarizability of the alkali metal atoms will fluctuate greatly, thereby affecting the final measurement accuracy. [0003] In order to achieve the stability of the...

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Problems solved by technology

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, provide a high-precision segmental pulse generation system and method for temperature control, and solve the problem of high-precision frequency control under the influence of the nuclear magnetic resonance gyro heating magnetic field

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