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•
21 Jan 1994
TL;DR: In this paper, a triangular optical path is formed by a cathode 12 and anodes 14, 16 and magnetic mirrors 20, 22, 24 are attached to the laser to form a triangular path.
Abstract: PURPOSE: To attain operation in all rotation speeds by providing one reflector with a 1st magnetic mirror, providing the other reflector with a 2nd magnetic mirror, and connecting corresponding inputs from a mirror control device to each magnetic mirror. CONSTITUTION: A laser is constituted of a cathode 12 and anodes 14, 16 and magnetic mirrors 20, 22, 24 are attached to the laser to form a triangular optical path. The 1st and 2nd magnetic mirrors 20, 22 function as route length control mirrors by a normal method. An output mirror 24 reflectes a part of light and transmits a part of light. Beams which are optical outputs from a gyro are arranged clockwise and counterclockwise, connected by a prism 29 and detected by a photodiode 27. The photodiode 27 detects and measures the relative movements of the optical stripes of crossing beams. Consequently, operation at all rotational speeds can be attained without approaching a lock-in region.
1 citations
Patent•
10 May 2011
TL;DR: In this article, the ring laser is operated in double-frequency conditions at one of orthogonally polarised ring laser modes, creating a frequency support by superposing magnetic field onto the active element of the ring Laser.
Abstract: FIELD: physics. ^ SUBSTANCE: method involves operation of a laser gyroscope in double-frequency conditions at one of orthogonally polarised ring laser modes, creating a frequency support by superposing magnetic field onto the active element of the ring laser, extraction of information on angular displacements from information coming from the ring laser, periodic successive operation of the ring laser in double-frequency conditions on modes with orthogonal polarisations of the ring laser. Switching from one mode of the ring laser to a mode with orthogonal polarisation during each successive periods of switching T, the first of which starts from the beginning of measuring angular displacements, is carried out in time equal to T/4 and 3T/4 of these periods. ^ EFFECT: invention reduces errors in measuring angular displacement during each period of switching over the measurement time, resulting from sensitivity of the laser gyroscope, working in double-frequency conditions, to magnetic fields without increasing the number of switches.
1 citations
TL;DR: In this paper, conservative coupling of modes in an integrated external-cavity semiconductor ring laser is used to suppress lock-in in an inertial rotation sensor, and the extent of suppression is dependent on refractive index difference between active and passive cavities.
Abstract: Conservative coupling of modes in an integrated external-cavity semiconductor ring laser is used to suppress lock-in in an inertial rotation sensor. Extent of suppression is dependent on refractive index difference between active and passive cavities.
1 citations
TL;DR: In this article, the scale factor of a Rate Biased Ring Laser Gyroscope (RBRLG) was investigated to satisfy the engineering requirement of high precision north-finding, and an online first order recursive algorithm was established to estimate scale factor change according to the periodicity of RBRLG measurement.
Abstract: To satisfy the engineering requirement of high precision north-finding,the north-finder based on a Rate Biased Ring Laser Gyroscope(RBRLG) and its measurement error come from the scale factor of RBRLG were studied to solve the problem on the scale factor slow change resulted from the inner temperature change and the instability of lock-in region of the RBRLG.Firstly,the change rule of scale factor was researched by a scale factor test.Then,the influence of the scale factor change on the north-finding precision was analyzed by a simulation.Finally,an online first order recursive algorithm was established to estimate the scale factor change according to the periodicity of RBRLG measurement.By introducing the platform angle measurement,the scale factor changes could be obtained.Simulated results indicate that the estimation error for the scale factor of RBRLG is less than 1×10-6 by the proposed algorithm,and the standard deviations of north-finding results caused by the scale factor change decrease to about 2″.The experiment on the north-finder results shows that this algorithm can effectively restrain the north-finding error caused by scale factor change,and the standard deviation is about 24″ for 5 min,which can basically satisfy the requirement of high precision north-finding.
1 citations
03 Jan 1986
TL;DR: An update of the large area (now 60m2) Passive Resonant Ring Laser Gyro (PRRLG) is given in this article, where performance is still predicted to be in the 10-10 earth rate unit (ERU) range.
Abstract: An update of the large area (now 60m2) Passive Resonant Ring Laser Gyro (PRRLG) is given. Some aspects of last year's design have changed; but performance is still predicted to be in the 10-10 earth rate unit (ERU) range. This is of interest for a number of geophysical applications.© (1986) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
1 citations