Topic
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.
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TL;DR: A Sagnac interferometer that uses a nonlinear adaptive medium for detection, with the continuous and low-frequency components filtered out by the adaptive nonlinear process in the medium.
Abstract: We present a Sagnac interferometer that uses a nonlinear adaptive medium for detection. The nonlinearity of the medium being characterized by a finite response time, the detection has a finite frequency bandwidth determining two operational regimes: at low variation rate of the rotation speed the interferometer operates in the slow-light regime, providing a direct measurement of the angular acceleration. For high variation rate of the rotation speed the amplitude of the alternating component of the Sagnac phase shift is instead detected, with the continuous and low-frequency components filtered out by the adaptive nonlinear process in the medium.
12 citations
05 Oct 2009
TL;DR: In this article, the coherent backscattering noise of a fiber optic gyroscope (FOG) interrogated with a laser decreases when the laser's coherence length exceeds the length of the fiber loop.
Abstract: Numerical simulations predict that the coherent backscattering noise of a fiber optic gyroscope (FOG) interrogated with
a laser decreases when the laser's coherence length exceeds the length of the fiber loop. With a sufficiently coherent
laser, this noise drops below the excess noise of the same FOG probed with broadband light. This new principle is
paramount for the air-core FOG, which has a low sensitivity to the Kerr effect but exhibits stronger backscattering. It is
also applicable to a conventional FOG. We provide evidence of this effect in an experimental FOG.
12 citations
Patent•
29 Jun 1987
TL;DR: In this paper, a multioscillator ring laser gyroscope includes a frame that encloses a closed optical path in which four circularly polarized optical waves propagate, and a combining optics system combining the waves to produce an interference pattern.
Abstract: A multioscillator ring laser gyroscope includes a frame that encloses a closed optical path in which four circularly polarized optical waves propagate. A combining optics system combining the waves to produce an interference pattern. A pair of photodetectors are placed in the interference pattern in half quadrature with respect to the interference pattern so that the detectors produce oscillatory output signals that are in quadrature with respect to each other. Signals indicative of the beat signal in the interference pattern are processed to determine the rotation rate, the direction of rotation and to provide a cavity length control signal.
12 citations
TL;DR: In this paper, a vibration isolation system (VIS) is employed inside a mechanically dithered Ring Laser Gyroscope (RLG) based Position and Orientation System (POS) to attenuate such disturbance but induces additional attitude measurement errors.
12 citations
Patent•
26 Jun 1991
TL;DR: In this article, a correction to the output angle of the ring laser gyroscope is calculated as a function of the phase difference and the magnitude of coupling between the two counterpropagating beams when the dither oscillations change direction.
Abstract: A correction to the output angle of the ring laser gyroscope is calculated as a function of the phase difference and the magnitude of coupling between the two counterpropagating beams when the dither oscillations change direction. A pair of heterodyne detectors produce heterodyne signals indicative of the interference pattern between the counterpropagating beams. A signal indicative of the sum of the separate beam intensities is demodulated with the heterodyne signals to determine the magnitude of coupling between the beams in the ring laser gyroscope.
12 citations