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.

Failure detection and isolation investigation for strapdown skew redundant tetrad laser gyro inertial sensor arrays

Abstract: The degree to which flight-critical failures in a strapdown laser gyro tetrad sensor assembly can be isolated in short-haul aircraft after a failure occurrence has been detected by the skewed sensor failure-detection voting logic is investigated along with the degree to which a failure in the tetrad computer can be detected and isolated at the computer level, assuming a dual-redundant computer configuration. The tetrad system was mechanized with two two-axis inertial navigation channels (INCs), each containing two gyro/accelerometer axes, computer, control circuitry, and input/output circuitry. Gyro/accelerometer data is crossfed between the two INCs to enable each computer to independently perform the navigation task. Computer calculations are synchronized between the computers so that calculated quantities are identical and may be compared. Fail-safe performance (identification of the first failure) is accomplished with a probability approaching 100 percent of the time, while fail-operational performance (identification and isolation of the first failure) is achieved 93 to 96 percent of the time.

Revolving optical path device and ring laser gyro

Abstract: PROBLEM TO BE SOLVED: To provide a new revolving optical path device, that can be realized at low cost, is suitable for a small-sized ring laser gyro. SOLUTION: A revolving optical path device comprises a base body 10 having a reference plane, one or more boards 20, 30, 40 laminated in parallel to the reference plane, in a direction of orthogonal to the reference plane, and a light source 50. In the base body 10 and/or one or more boards, reflecting planes 21, 22, 41 which have normal lines within a predetermined single plane PL1 orthogonal to the reference plane are formed, in parallel with or inclined at a predetermined angle to the reference plane. The light source 50 is arranged so as to emit light on the predetermined one plane PL1, and the light emitted from the light source 50 revolves to forward/reverse direction on the PL1 plane by the reflecting planes 21, 22, 41 to form a revolving optical path LC and emit a laser beam. COPYRIGHT: (C)2009,JPO&INPIT

Laser gyroscopes for very high sensitive applications

Abstract: We present a summary of the recent results obtained with the “G-Pisa” laser gyroscope prototype in the field of rotational metrology. The experimental apparatus consists in an He-Ne laser having a planar square cavity 1.35 m in side that can be operated both in the vertical and in the horizontal plane. For about one year, the ring laser has been utilized by the Virgo gravitational wave interferometer with the aim of estimating and monitoring the local rotational noise which is degrading the performances of its inertial suspensions. Results in the field of environmental monitoring for the improvement of the suspension control as well as the results in the field of rotational seismology are presented. In the last part of the paper we present some considerations about the possibility of performing a ground-based General Relativity test using an array of ring lasers.