Laser gyroscope frequency stabilization control system and method based on DSP and FPGA

Abstract

The invention discloses a laser gyroscope frequency stabilization control system and method based on a DSP and an FPGA. The system comprises piezoelectric ceramic and an annular resonant cavity, and further comprises a light intensity detection device, an SBS detection device, a light intensity filter circuit, an A / D converter, a D / A converter, a high-voltage amplification circuit and a microprocessor, and the microprocessor comprises a DSP main processor and an FPGA coprocessor; the light intensity detection device is connected with the light intensity filter circuit, the light intensity filter circuit and the SBS detection device are electrically connected with the A / D converter, the A / D converter is connected with the FPGA coprocessor, the FPGA coprocessor is communicated with the DSP main processor, and the DSP main processor is connected with the upper computer; and the FPGA coprocessor is electrically connected with an input port of the D / A converter. The laser gyroscope frequency stabilization control system and method based on the DSP and the FPGA have the differential push-pull frequency stabilization function, and the measurement precision of the laser gyroscope is improved.

Description

technical field [0001] The invention relates to the technical field of frequency stabilization control systems for laser gyroscopes, in particular to a laser gyroscope frequency stabilization control system and method based on DSP and FPGA. Background technique [0002] In the ring resonator of the laser gyroscope, the oscillation frequency v of the laser is the longitudinal mode frequency of the ring resonator, i.e. v=qc / n L, where: L is the length of the ring resonator, hereinafter referred to as the cavity length; c is the speed of light; n is the refractive index; q is a positive integer, which is called a mode; many factors will cause changes in the cavity length L and the refractive index n, both of which will cause changes in the longitudinal mode frequency v, and the change △v can be expressed as: [0003] [0004] When the cavity length changes, the longitudinal mode frequency v will drift within the gain profile, which will cause the change of the scale factor o...

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Problems solved by technology

[0004] When the cavity length changes, the longitudinal mode frequency v will drift within the gain profile, causing changes in the scale factor of the laser gyro and zero drift, resulting in measurement errors of the laser gyro

[0005] Therefore, the stability and accuracy of the scale factor mainly depend on the accuracy and stability of the cavity length L. Although the laser gyroscope uses microcrystalline quartz glass with a small expansion rate, it will still produce slight deformation when the surrounding environment changes, and eventually Affects the function of the laser gyro

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