Method for suppressing relative intensity noises of light source in fiber optic gyroscope
A relative intensity noise, fiber optic gyroscope technology, applied in the field of gyroscopes, can solve the problems of inability to apply and popularize well, high cost, etc., and achieve the effect of good light source relative intensity noise compensation effect, low cost, and good noise suppression effect.
Active Publication Date: 2018-08-24
PEKING UNIV
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[0013] In the method of suppressing the relative intensity noise of the high-precision fiber optic gyroscope, two methods of optical path or circuit are usually used for compensation, and the reference signal at the other end of the coupler is used to extract the noise information of the light source, which is offset with the original measurement signal, thereby suppressing the measurement The relative noise component of the light source in the signal is characterized in that the fiber optic gyroscope adopts a closed-loop structure and adopts square wave modulation, which can better reduce the influence of the relative intensity noise of the light source, but it also causes a higher cost. It cannot be well applied and promoted in the gyroscope
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[0035] The present invention will be further described below in conjunction with the accompanying drawings.
[0036] The structure of the present invention is as figure 2As shown, in any open-loop fiber optic gyroscope based on the minimum reciprocal structure, its basic composition includes a fiber optic light source, a light source end coupler, a polarizer, a ring end coupler, a fiber ring, a PZT phase modulator. The interference signal terminal output by the coupler at the light source end is connected to the photodetector PD1, and the reference signal output from the light source only passing through the coupler at the light source end is connected to the photodetector PD2. The interference signal and the reference signal are suppressed and demodulated by the joint demodulation module to suppress and demodulate the relative intensity noise of the light source, and the joint output signal can better eliminate the noise and improve the detection sensitivity.
[0037] The ...
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The invention discloses a method for suppressing the relative intensity noises of a light source in a fiber optic gyroscope. The method comprises the following steps: 1) performing power equalizationon a received interference signal and a reference signal; wherein the interference signal is an interference signal output by the fiber optic gyroscope, and the reference signal is the signal of the light source in the fiber optic gyroscope; 2) calculating the harmonic components of the interference signal after the power equalization, and calculating the harmonic components of the reference signal after the power equalization; 3) performing addition operation on the odd harmonic components of the interference signal and the reference signal, and performing a subtraction operation on the evenharmonic components of the interference signal and the reference signal to obtain the harmonic components of the output signal of the fiber optic gyroscope after noise compensation; and 4) performingmulti-harmonic demodulation on the noise-compensated output signal. The method can achieve a good light source relative intensity noise compensation effect and realize a high gyroscope precision and ahigh stability.
Description
technical field [0001] The invention belongs to the technical field of gyroscopes, and in particular relates to a method for suppressing relative intensity noise of a light source applied in an open-loop interference fiber optic gyroscope. Background technique [0002] Fiber optic gyroscope is a kind of fiber optic sensor sensitive to angular rate. With the continuous development of this technology, fiber optic gyroscope has achieved remarkable industrialization results in military and commercial fields. As the most mature representative of fiber optic gyroscope technology, interferometric fiber optic gyroscopes are widely used in navigation guidance, attitude control and other application scenarios. [0003] Reducing the noise in the fiber optic gyroscope and improving the signal-to-noise ratio are important ways to improve the detection sensitivity of the fiber optic gyroscope. Among the main sources of noise, thermal noise is the phase noise caused by the thermal fluctua...
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IPC IPC(8): G01C19/72
CPCG01C19/721
Inventor 贲放李玉林罗荣亚何动邓圣彭超李正斌
Owner PEKING UNIV