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.

Solid state split-gain multioscillator ring laser gyroscope

Abstract: Disclosed herein is a Solid State Split-Gain Multioscillator Ring Laser Gyroscope comprising, in a preferred embodiment, a solid state Nd:YAG crystal body defining a non-planar resonator path. Magnetic sources are provided which effectuate the Split-Gain Selective Mode Suppression Phenomena. Total internal reflection along facets of the crystal or glass allow reduced cost during manufacture of the Gyroscope. An alternative embodiment includes a solid state active medium on a chip, allowing the resonator path to be primarily lying in a glass monolithic compact solid state frame.

Dual-input fiber-optic gyroscope

Abstract: A fiber-optic gyroscope is operated at maximum sensitivity by supplying two equal-intensity inputs with a specific phase difference to the gyroscope beam splitter. When the beam-splitter outputs have equal intensity, reciprocity requires the Sagnac interferometer to be at quadrature. A sensitivity of ∼0.93 rad−1 is demonstrated with a minimum-detectable rotation rate of 0.4 deg/sec.

Fiber-optic gyroscope operated with a frequency-modulated laser

Abstract: We propose using a frequency-modulated laser in a fiber-optic gyroscope (FOG) in a minimum configuration. Compared to the traditional broadband source, a narrow-band laser offers two significant advantages, namely the elimination of excess noise and thus improved sensitivity to rotation, and a more stable mean wavelength, hence a greater scale-factor stability. We show that the strong back-reflection and coherent backscattering noise introduced by the use of a laser is greatly reduced by modulating the laser frequency. In both a conventional FOG and in a FOG using an air-core fiber, we demonstrate experimentally that this technique reduces these two sources of noise by at least a factor of 4 compared to the same gyros operated with an unmodulated laser.

GG1308 ring laser gyro inertial measurement systems: Honeywell's low-cost solution for tactical applications

Abstract: The GG1308 ring laser gyro (RLG) inertial measurement systems represent the smallest-volume, lightest-weight, and lowest-cost RLG systems. These systems are designed to provide the functions required for inertial guidance, aided or midcourse navigation, and vehicle stabilization and control to a wide variety of tactical missiles, standoff weapons, unmanned aerial vehicles, torpedoes, and manned rotorcraft. GG1308 inertial systems achieve their low cost as a result of several significant development thrusts. Low-cost inertial sensors must be utilized. The GG1308 RLG is a true design-to-cost device with producibility and the cost of parts, materials, assembly labor, and manufacturing automation being the dominant design drivers. Additionally, these GG1308 inertial systems use a commonality design approach. This philosophy has made it possible to develop several generic hardware elements which need only be repackaged to provide an inertial system in the form factor required for specific programs. It also provides the system with an adaptability and intelligence to improve its performance throughout its useful life by making software improvements which do not affect the hardware design or production process. >

Pathlength controller for three-axis ring laser gyroscope assembly

Abstract: A pathlength controller is provided for a three-axis, cube-shaped ring laser gyroscope assembly having three four-sided gyroscopes with six mirrors, including three movable mirrors and three fixed mirrors, wherein the controller connects between the three movable mirrors and the three fixed mirrors, and is adapted to change the pathlength of one gyroscope without changing the pathlengths of the other two gyroscopes.