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•
08 Jun 1981TL;DR: An equilateral triangular ring laser gyroscope contains drivers to vibrate two of the mirrors synchronously and oppositely along paths displaced by about 427° from the bisector of the vertex angles at which those mirrors are located as discussed by the authors.
Abstract: An equilateral triangular ring laser gyroscope contains drivers to vibrate two of the mirrors synchronously and oppositely along paths displaced by about 427° from the bisector of the vertex angles at which those mirrors are located The magnitude of displacement is about 0761 λ, where λ is the wavelength of laser radiation The purpose of the vibration is to reduce the lock-in effect in the ring laser gyroscope
17 citations
TL;DR: GINGERINO as mentioned in this paper is a large frame ring laser gyroscope, operating free running and unattended inside the underground laboratory of the Gran Sasso, Italy, where the main geodetic signals, i.e., Annual and Chandler wobbles, daily polar motion and Length of the day, are recovered from GINGERino data using standard linear regression methods, demonstrating a sensitivity better than 1 prad/s, therefore close to the requirements for an Earth-based Lense-Thirring test.
Abstract: Measuring in a single location on Earth its angular rotation rate with respect to the celestial frame, with a sensitivity enabling access to the tiny Lense-Thirring effect is an extremely challenging task. GINGERINO is a large frame ring laser gyroscope, operating free running and unattended inside the underground laboratory of the Gran Sasso, Italy. The main geodetic signals, i.e., Annual and Chandler wobbles, daily polar motion and Length of the Day, are recovered from GINGERINO data using standard linear regression methods, demonstrating a sensitivity better than 1 prad/s, therefore close to the requirements for an Earth-based Lense-Thirring test.
16 citations
Patent•
21 Jul 1998TL;DR: In this paper, a gas laser, constructed on a low thermal expansion, lithium containing, glass-ceramic frame, with a negatively charged trap electrode, was applied directly to the frame surface near the cathode for the purpose of intercepting mobile positive ions transported under the influence of the anode to cathode electric field during laser operation.
Abstract: A gas laser, constructed on a low thermal expansion, lithium containing, glass-ceramic frame (10), with a negatively charged trap electrode (17) applied directly to the frame surface near the cathode (15) for the purpose of intercepting mobile positive ions transported under the influence of the anode (14) to cathode (15) electric field during laser operation. Application to a Ring Laser Gyroscope.
16 citations
TL;DR: In this article, a coupled-resonator optical waveguide (CROW) gyroscope consisting of a Sagnac interferometer in which light is coupled between adjacent loops in the coil is presented.
Abstract: This paper reports a theoretical study of a recently proposed coupled-resonator optical waveguide (CROW) gyroscope consisting of a Sagnac interferometer in which light is coupled between adjacent loops in the coil. Simulations show that after optimization, this gyroscope is less sensitive to rotation than a conventional resonant fiber-optic gyroscope (RFOG) made of a single loop. Instead, the sensitivity decreases as the number of loops is increased. The fundamental reason is that in both types of sensors, the sensitivity is proportional to the group delay, and the maximum achievable group delay is limited in the same manner by loss. In addition, this CROW gyroscope utilizes multiple resonators instead of one, so it is much harder to stabilize against external perturbations. The RFOG still stands as the ideal candidate for a compact resonant gyroscope.
16 citations
Patent•
01 Dec 1980TL;DR: Bias shift caused by distortion of a ring laser gyroscope block is corrected by bending the block Electromechanical bending devices may be piezoelectric crystals adherently attached to the block and resposive to voltage derived from distorting influences as mentioned in this paper.
Abstract: Bias shift caused by distortion of a ring laser gyroscope block is corrected by bending the block Electromechanical bending devices may be piezoelectric crystals adherently attached to the block and resposive to voltage derived from distorting influences
16 citations