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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Patent•
31 Oct 1996TL;DR: A backscatter or secondary wave error reducer for an interferometric fiber optic gyroscope having at least one phase modulator for receiving a square wave bias phase modulation signal and a sine wave carrier suppression modulation signal is presented in this paper.
Abstract: A backscatter or secondary wave error reducer for an interferometric fiber optic gyroscope having at least one phase modulator for receiving a square wave bias phase modulation signal and a sine wave carrier suppression modulation signal. The amplitude of the carrier suppression modulation signal is sufficient to greatly reduce the interference between two sets of backscattered or secondary waves of light originating in the Sagnac loop of the gyroscope. Reduction or elimination of the interference of the two sets of secondary waves reduces or eliminates the secondary wave induced rotation rate sensing error. The frequency of the carrier suppression signal is near or equal to an even harmonic of the proper frequency of the Sagnac loop to reduce the sinusoidal or periodic rotation rate sensing error caused by the carrier suppression modulation signal.
21 citations
TL;DR: In this article, a nonlinear wave interaction is considered as a technique to increase the rotation sensitivity of the ring laser and the gyroscopic scale factor is calculated in an active laser gyro with a dispersive medium.
Abstract: A nonlinear wave interaction is considered as a technique to increase the rotation sensitivity of the ring laser. The gyroscopic scale factor K is calculated in an active laser gyro with a dispersive medium. K is in reverse proportion to the group index n* = n + vdn/dv of the medium. In a monolithically-integrated GaAs ring laser, the value K ∼5000 is obtainable (radius ∼1 cm) in a linear case. In the presence of a strong wave, the dynamic nonlinear anomalous dispersion can provide an increase of K by 10–100 times in the vicinity of critical points where n* passes zero. An expression of K is derived for the nonlinear Sagnac effect. The nonlinear dispersion is discussed in terms of “slow/fast” light.
21 citations
11 Feb 2010
TL;DR: In this paper, a number of optical gyroscope architectures utilizing either slow or fast light have been recently proposed in the literature to enhance rotation sensitivity, with a view to separate the schemes that offer a genuine enhancement from the ones that do not.
Abstract: This paper reviews a number of optical gyroscope architectures utilizing either slow or fast light that have been recently
proposed in the literature to enhance rotation sensitivity, with a view to separate the schemes that offer a genuine
enhancement from the ones that do not. The overall conclusion is that although slow-light coupled-resonator systems
have interesting applications in other fields, for example for filtering or switching, none of the schemes proposed to date
enable any enhancement in rotation sensitivity. Simple guidelines are outlined in an attempt to help clear misconceptions
and hopefully reduce the number of erroneous publications on this subject in the future. On the other hand, fast light in a
ring laser gyro can potentially enhance rotation sensitivity by up to six orders of magnitude. Future research directions
likely to be fruitful are also outlined.
21 citations
Patent•
21 Jan 1980
TL;DR: In this paper, a laser gyro coupling system was proposed which utilizes a pair of resilient rings located between a plate attached to the laser dither suspension mechanism and the lower surface of a ring laser to form a reservoir for a viscous fluid.
Abstract: This invention relates to a laser gyro coupling system which utilizes a pair of resilient rings located between a plate attached to the laser dither suspension mechanism and the lower surface of a ring laser to form a reservoir for a viscous fluid The coupling system permits the dither suspension mechanism to drive the ring laser at its dither frequency without transmitting stresses to the ring laser due to thermal expansion
20 citations
Patent•
06 Apr 1990
TL;DR: In this article, a radio frequency excitation system is disclosed for use in conjunction with a ring laser gyroscope, which is comprised of a closed resonant cavity which surrounds a helical coil driven at a high radio frequency at a range of 5 to 550 megahertz.
Abstract: A radio frequency excitation system is disclosed for use in conjunction with a ring laser gyroscope. The radio frequency excitation system is comprised of a closed resonant cavity which surrounds a helical coil driven at a high radio frequency at a range of 5 to 550 megahertz. This closed resonant coil surrounds one leg of a ring laser gyroscope which is carved out and exposed so that it may be surrounded by the resonant cavity. Using such a radio frequency excitation system eliminates the need for high power DC discharge components such as cathodes and anodes, as well as problems inherent with properly sealing the cathodes and anodes to the monolithic frame of the ring laser gyroscope.
20 citations