Passive laser gyroscope

Abstract

The invention discloses a passive laser gyroscope, comprising a laser apparatus, a line-width reduction feedback device and a gyroscope apparatus, wherein the laser apparatus outputs a first laser signal to the line-width reduction feedback device and outputs a second laser signal to the gyroscope apparatus; the line-width reduction feedback device provides the first laser signal to an FP cavity and feeds the laser signal outputted by the FP cavity or an electric signal converted from the laser signal back to the laser apparatus; the laser apparatus locks a central frequency of the first laser signal outputted by the laser apparatus as a resonant frequency of the FP cavity by using the feedback signal; the gyroscope apparatus receives the second laser signal outputted by the laser apparatus; and rotation angular velocity of the gyroscope apparatus is determined by using the line-width reduction laser signal. The central frequency of the laser signal is locked as the resonant frequency of the FP cavity by using a feedback signal mode, so that stability of line-width reduction and the laser frequency of the laser outputted by the laser apparatus can be realized; and precision and sensitivity for measurement of the rotation angular velocity of the laser gyroscope can be increased.

Description

technical field [0001] The invention relates to laser technology, in particular to a passive laser gyroscope. Background technique [0002] As the core inertial device of the inertial navigation system, the gyroscope can be used to measure the small changes in the direction of the aircraft during flight, which helps the inertial navigation system to continuously calculate the position, speed and direction of the aircraft, and realize the aircraft without external reference. Therefore, gyroscopes play a very important role in many fields of national defense science and technology and national economy. Since the invention of laser in the 1960s, research on optical inertial navigation based on the Sagnac effect has developed rapidly. Compared with the traditional mechanical gyroscope, since it does not need to move components during operation, its reliability and resolution have a lot of room for improvement. According to the geometric relationship between the laser gain medi...

AI Technical Summary

Problems solved by technology

However, in the traditional gyroscope, for the former, the general ring cavity, especially the ring cavity with a larger ring area, is difficult to effectively suppress external interference, thus reducing the stability of the gyroscope.

Therefore, the improvement of the stability of the cavity is limited by the technical

As for the latter, because the line width and stability of ordinary lasers are not very good, this also directly limits the accuracy of the laser gyroscope.

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