Ring laser gyroscope

About: Ring laser gyroscope is a research topic. Over the lifetime, 2070 publications have been published within this topic receiving 18609 citations. The topic is also known as: Sagnac interferometer.

Suppressing backscattering noise of a resonant fiber optic gyroscope using coherent detection.

Abstract: This paper provides a novel, to the best of our knowledge, method for suppressing backscattering noise of a resonant fiber optic gyroscope (RFOG) with a coherent detection technique. The light from the fiber ring resonator is mixed with a reference beam rather than being demodulated directly in traditional configurations, generating a coherent signal with a radio frequency. The central frequencies of the two reference lights used for the clockwise and counterclockwise waves are different to avoid the effect of backscattered waves. Besides, a common phase modulation is applied on the two counter-propagating waves to eliminate the parasitic effect due to the residual amplitude modulation in the phase modulator. Two demodulation schemes for the rotation rate detection from the coherent signals are then proposed and demonstrated, with performance on noise suppression tested. One is the beat-frequency demodulation, and the other is the self-mixing demodulation technique. The influence of backscattering intensity is reduced from 270°/h to 3°/h and 0.05°/h with the two demodulation techniques, respectively, showing a full suppression of backscattering noise.

Random Error Analysis of Ring Laser Gyro Using Allan Variance Method

Abstract: The Allan variance method is used in analyzing the static output signal of the Ring Laser Gyro(RLG) in iner- tial Measurement Unit(IMU).It can determine the character of RLG and identify the source of random error.The con- clusion afford the theory for improving the character of RLG.

Laser gyroscope based on parallel feedback

Abstract: The invention provides a laser gyroscope based on parallel feedback, comprising an Er-doped fiber amplifier, an F-P cavity filter, a multimode light transmission medium, a 90/10 coupler, a 50/50 coupler and a photoelectric detector, wherein the Er-doped fiber amplifier is connected with the F-P cavity filter, the multimode light transmission medium and the 90/10 coupler in series via single mode light transmission media so as to form an annular cavity, the through end of the 90/10 coupler is connected to the annual cavity, two coupling ends of the 90/10 coupler serve as output ports of a bidirectional light path, two coupling output ends of the 90/10 coupler are connected with the two input ends of the 50/50 coupler, and the output ends of the 50/50 coupler are connected with the photosensitive detector. The multimode light transmission medium can be utilized to compress line width based on the ultra-narrow line width laser gyroscope without increasing the length of Er-doped fiber greatly, thus greatly enhancing the measurement precision of the laser gyroscope and reducing the cost. In addition, the Sagnac effect can be amplified by the laser gyroscope in the invention.

Digital to analog interface conversion circuit

Abstract: An interface circuit is provided to allow substitution of digital output rotation sensors such as fiber optic gyroscopes or ring laser gyroscopes in place of spinning mass gyroscopes. The pulses generated from the fiber optic gyroscope, or from a ring laser gyroscope are converted to a voltage representative of volts per degrees per second and are summed with an inverted volts per degrees per second at an integrating summing amplifier to result in an error signal in volts per degrees per second when there is a difference between the actual output of the gyroscope and the command signal.