A fiber optic gyroscope frequency stabilization device and frequency stabilization method

Abstract

The invention relates to a fiber gyroscope frequency stabilization apparatus and a frequency stabilization method thereof. Laser emitted by a laser light source goes through a first beam splitter and is divided into two laser paths, one of the two laser paths sequentially goes through a quarter wave plate and a second beam splitter, and is divided into two laser lights which are a pump laser s and a probe laser p, and the pump laser s goes through an atomic chamber, enters an optical fiber loop from a first port, and is emitted through a second port; the probe laser p enters the optical fiber loop from the second port, is emitted through the first port and goes through the atomic chamber, the laser paths of the pump laser s and the probe laser p coincide, the two emitted lasers go through the second beam splitter and are divided into a laser signal I8 and a laser signal I9, the laser signal I8 is received by a first photoelectric detector and is converted into a first electric signal, and the laser signal I9 sequentially goes through the quarter wave plate and the first beam splitter, is received by a second photoelectric detector and is converted into a second electric signal; and the sum of the two electric signals is the output signal of a fiber gyroscope, and a difference between the two electric signals is a frequency stabilization error signal.

Description

technical field [0001] The invention relates to the field of inertial measurement, in particular to an optical fiber gyroscope frequency stabilization device and a frequency stabilization method. Background technique [0002] The fiber optic gyroscope is a solid-state inertial device that uses the Sagnac effect of the fiber optic loop to measure the rotation of an object in the inertial space. It can measure the rotation angle or angular velocity by measuring the movement of the interference fringes. It is an important inertial navigation device. [0003] In the fiber optic gyroscope, the movement of the interference fringes is proportional to the rotational angular velocity, but it is also affected by the frequency of the laser light source. When the frequency of the laser light source jitters or drifts, the proportional relationship between the movement of the interference fringes and the rotational angular velocity also occurs. Changes, resulting in jitter or drift in the...

AI Technical Summary

Problems solved by technology

[0004] Diode laser is one of the laser light sources commonly used in fiber optic gyroscopes. There are mainly two types of feedback type and external cavity type. Generally, the frequency of the laser light source is stabilized by temperature stabilization and current stabilization. Although the method of temperature stabilization and current stabilization can suppress The jitter of the laser source frequency, but due to the lack of closed-loop frequency stabilization design such as frequency stabilization cavity or frequency stabilization spectrum in the design of the fiber optic gyroscope, the long-term drift of the laser source frequency cannot be solved, which limits the improvement of the main performance indicators of the fiber optic gyroscope , hindering the development of high-precision fiber optic gyroscopes

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