Detective method of the novel ring laser gyroscope

A detective method adopted to the output signal was given through the analysis of the output signal of the novel four-frequency differential ring laser gyroscope, which was that the signal was received by an Avalanche Photo Diode (APD) and a high-frequency low-noise preamplifier, and by a centralizing selection filter circuit, the signal was filtered and amplified, and then by an analog multiplier, self-multiplying demodulation was achieved, and an actual circuit based on mentioned method was designed. The back-direction output of a four-frequency straight laser was used to simulate the output signal of the novel ring laser gyroscope, and test the circuit panel. Through the tests, the feasibility of the detective method is confirmed.