System and method for detecting lock-in threshold of double-longitudinal-mode laser gyroscope under tunable frequency

Abstract

The invention discloses a system and a method for detecting a lock-in threshold of a double-longitudinal-mode laser gyroscope under tunable frequency. The system comprises a ring laser, wherein lightcombining prisms are arranged at two corners of the ring laser respectively; a beam splitter and a reflector are arranged respectively in the horizontal positions of laser beams emitted by the first light combining prism; a photodetector, a first FPGA and a double-longitudinal-mode state controller are arranged respectively in the horizontal positions of laser beams reflected by the beam splitter;a double-optical-window photodetector, a second FPGA and a first computer controller are arranged respectively in the horizontal positions of laser beams reflected by the reflector; the ring laser isconnected with a digital test base, a rate turn table and a second computer controller through wires. The detection method comprises the following steps: firstly, working frequency of a ring resonantcavity is stabilized, then the rate turn table is started, when the ring laser is locked in, a synthesized Lissajous figure is observed on the first computer controller, and the lock-in threshold ofthe laser gyroscope is read out; according to the system, the detection process is simple, processing is fast, and an assembly result is accurate.

Description

technical field [0001] The invention belongs to the technical field of precision detection equipment, and in particular relates to a dual longitudinal mode laser gyro frequency-tunable blocking threshold detection system and detection method. Background technique [0002] Laser gyro is an ideal device for strapdown inertial navigation systems, and plays an important role in the fields of missile guidance, aircraft flight control, and aerospace remote sensing satellite attitude control. The laser gyro will be in a locked state during work. In this state, all the information reflecting the rotation of the gyro relative to the inertial space will be lost, and the gyro will fail. [0003] At present, the detection method of laser gyroscope locking threshold is generally aimed at single longitudinal mode laser gyroscope. This judgment method has the problem of pulse number fluctuation caused by circuit noise, which causes the problem of reading error of gyroscope locking threshol...

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Problems solved by technology

[0003] At present, the detection method of laser gyroscope locking threshold is generally aimed at single longitudinal mode laser gyroscope. This judgment method has the problem of pulse number fluctuation caused by circuit noise, which causes the problem of reading error of gyroscope locking threshold. At the same time, due to the variable speed movement of the turntable, the table Axis jump will also cause the gyro to go out of the lock zone early

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