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.

Frequency stabilization research of Brillouin fiber-optic gyroscope

Abstract: Brillouin fiber optic gyroscope has the advantages of simple structure, solid stability, high sensitivity and resolution, high dynamic range and so on, it can be used in plenty of inertial sensor systems. In this paper, frequency stabilization problem of Brillouin fiber-optic gyroscope is researched and analyzed, then a new frequency stabilization technique is proposed, experimental results showed that this program has a good solution to the Brillouin fiber-optic gyro stabilized problem.

Effects of back reflection on the fiber ring laser gyroscope

Abstract: In this Letter, the effects of the backreflection coefficient on a fiber ring laser gyroscope (FRLG) are discussed in detail. By applying the mode coupling equations, the eigenmodes in the FRLG are theoretically analyzed. We have found that the degree of intensity oscillation is intimately related to the backreflection coefficient in the FRLG; we have also explored the theoretical responding curve of FRLG. By utilizing a bidirectional filter with a tunable backreflection coefficient, our conclusions are proven. Two responding curves were obtained under two different backreflection coefficients, the scale factors of which are 1.4405 kHz/deg·s−1 and 1.3096 kHz/deg·s−1, respectively. The lock-in ranges of the curves are within 10 deg/s and 15 deg/s.

Space Tug laser gyro IMU

Abstract: A redundant inertial measuring unit (IMU) incorporating six strapdown laser gyros and six accelerometers, arranged so that sensitive axes are normal to the faces of a dodecahedron, provides enhanced reliability with reduced hardware weight. Software monitoring of sensor outputs senses failure of sensors and the system is designed for triple redundancy, with built-in test equipment. Attention is centered on redundancy and fail-safe features, and on the closed-path ring laser gyro arrangement.

Ring laser gyro

Abstract: PURPOSE:To facilitate measurement of a minute angular velocity without rotating motion by a method wherein 1st frequency shifter which increases the frequency if incident light by a predetermined value and 2nd frequency shifter which reduces the frequency of the incident light by a predetermined value and a laser medium are provided in a ring form optical waveguide CONSTITUTION:Light is emitted from a laser medium 14 to the left direction or the right direction and its frequency is increased or reduced by a certain value DELTAf by 1st or second frequency shifter 12 or 13 The light is propagated through an optical waveguide 11 and its frequency is returned to the initial value by the 2nd or the 1st frequency shifter 13 or 12 and the light enters the laser medium 14 As the frequency of the light entering the laser medium 14 is equal to the frequency of the light emitted from the laser medium 14, two types of beams which are propagated counter-clockwise and clockwise are resonated in this system Those beams are taken out by a beam splitter 15 and the differential frequency is measured by an interferometer 16 With this constitution, if the differential frequency between the beams propagated clockwise and counter-clockwise is measured when the system is rotated, the angular velocity of rotation of the system can be detected

Waveguide-coupling to be used in a micro optical laser gyroscope

Abstract: A new concept for the realization of a micro optical laser gyroscope was developed. This new concept involves a passive free space ring resonator in which the light is circulating by reflections at three double mirrors and an external light source to activate the resonator. To couple the light in and out of the resonator waveguide-couplers are employed. This paper reports on the simulation of waveguide-coupler structures and on experimental investigation of coupling efficiency using micro fabricated SU-8 coupler structures. The modeled coupler structures consist of two parallel waveguides. The waveguides with rectangular profile are in close proximity i.e. separated only by a narrow gap over a certain path length Waveguide-coupler structures with similar geometries have been micro fabricated and optically characterized. It has been found that as a consequence of the lithographic formation of SU-8 high aspect ratio waveguides residual SU- 8 material remains between the waveguides as the gaps become very small (below 5 μm). In these structures a parasitic connection between the two parallel waveguides could be identified. No coupling effect was observed in the micro fabricated devices with perfect gap separation. From comparison of simulations and experiments we can conclude that there is a coupling mechanism based on the residual SU-8 material bridging the separation gap. Bridging allows coupling light at gaps even larger than 1 μm. Such residual material coupling can be achieved with SU8 lithographic high aspect ratio structuring (height 30 μm x width 50 μm or height 30 μm x width 20 μm) in which sub μm-gaps are almost impossible to produce with standard technologies.