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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.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors presented the concept of a microelectromechanical system ring laser gyroscope (MEMS-RLG) and its optical components, which has a semiconductor optical amplifier (SOA) enclosed with mirrors that form an optical loop for an external laser oscillator in free space.

9 citations

Patent
30 May 1989
TL;DR: In this paper, a monolithic triaxial ring laser gyroscope includes three orthogonal ring cavities, the optical path length of each of which is independently controllable.
Abstract: A monolithic triaxial ring laser gyroscope includes three orthogonal ring cavities, the optical path length of each of which is independently controllable. Three planar ring cavities are formed within a frame that is shaped into the form of a rhombic dodecahedron. A mirror is fixed to each of the twelve faces of the frame for directing the counter propagating light beams within the three orthogonal cavities. Anodes which communicate with the cavities through bore holes are fixed to predetermined surfaces of the frame while three cathodes are positioned at flattened portions of preselected vertices of the dodecahedron and located in such a way as to eliminate undesired bias resulting from Fresnel-Frizeau effects.

9 citations

Patent
11 Jul 2002
TL;DR: In this article, a monolithically integrated semiconductor laser rotation sensor/gyroscope that includes at least two isolated, nonsynchronized semiconductor lasers; at least one being unidirectional and at least a further one being either a straight-line laser or a second unIDirectional ring laser configured to propagate lasing light waves in the direction opposite to the first unidimensional ring laser; semiconductor directional waveguide couplers; a semiconductor Y-junction mixing region; and an semiconductor photodetector.
Abstract: A monolithically integrated semiconductor laser rotation sensor/gyroscope that includes at least two isolated, nonsynchronized semiconductor lasers; at least one being unidirectional and at least a further one being either a straight-line laser or a second unidirectional ring laser configured to propagate lasing light waves in the direction opposite to the first unidirectional ring laser; semiconductor directional waveguide couplers; a semiconductor Y-junction mixing region; and a semiconductor photodetector. Evanescently outcoupled signals are routed to a photodetector for detection of the Sagnac shifted frequencies to discern a beat frequency resulting from rotation of the chip structure. The straight-line semiconductor laser serves as frequency reference insensitive to rotation. Directing, filtering, and radiating unwanted reflections or backscattered light to highly absorbing regions is carried out with waveguide coupler designs and nonreciprocal couplers and filters.

9 citations

Proceedings ArticleDOI
02 Jun 2014
TL;DR: In this article, an experimental fiber optic gyroscope (FOG) utilizing a 1085m coil of 8-cm diameter driven with a laser of 10-MHz linewidth, with a record rotation-rate noise as low as 0.2 deg/h/ Hz and a drift below 0.038 deg /h.
Abstract: We report an experimental fiber optic gyroscope (FOG) utilizing a 1085-m coil of 8-cm diameter driven with a laser of 10-MHz linewidth, with a record rotation-rate noise as low as 0.2 deg/h/ Hz and a drift below 0.038 deg/h. Simulations and comparison to the measured performance of a similar 150-m FOG show that the dominant phase-bias errors have complicated length dependencies and consist of a combination of coherent backscattering and polarization coupling errors. Keywords: Fiber optic gyroscope, inertial navigation, rotation sensing, Sagnac interferometer 1. INTRODUCTION Fiber optic gyroscopes (FOGs) based on the Sagnac effect exhibit remarkable performance characteristics, thanks in part to their inherent reciprocity, which provides superior thermal stability and immunity to several sources of noise, and to the broadband light source used to interrogate them, which pract ically eliminates other sources of noise and drift in the fiber interferometer 1 . Commercial FOGs have very low noise and drift, for example 0.1 deg/ h and 1 deg/h, respectively, in the LN-200 unit from Northrop-Grumman

9 citations

Journal ArticleDOI
TL;DR: In this paper, the authors demonstrate a significant improvement in the performance of a mode-locked fiber laser gyroscope by using a lock-in amplifier, which is insensitive to the intensity difference between two pulses that causes phase error in the time interval measurement.
Abstract: We demonstrate a significant improvement in the performance of a mode-locked fiber laser gyroscope by using a lock-in amplifier. We show that the direct output of the lock-in amplifier has a desirable linear dependence on the rotation rate and is insensitive to the intensity difference between two pulses that causes phase error in the time interval measurement. Two orders of magnitude improvement is demonstrated in the long-term stability compared to that from previously reported time interval measurement.

9 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202347
202275
202130
202062
201963
201841