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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07 Jun 1985
TL;DR: In this article, an inertial sensor assembly (ISA) includes a cluster of three ring laser gyros, each gyro producing an output signal having a pulse repetition rate representative of the rate of angular deviation of the ISA about one of three coordinate axes X, Y, and Z.
Abstract: An inertial sensor assembly (ISA) includes a cluster of three ring laser gyros, each gyro producing an output signal having a pulse repetition rate representative of the rate of angular deviation of the ISA about one of three coordinate axes X, Y, and Z. The ring laser gyros are synchronously dithered at a relatively constant rate. The ISA also includes a triad of three accelerometers, with each accelerometer producing an output signal representative of the rate of velocity deviation of the ISA along one of the X, Y, and Z coordinate axes. A first processor, P1, accumulates the pulses produced by each ring laser gyro over its dither period. The resultant counts are stored in registers for subsequent sampling by the P1 processor at a periodic sampling rate which is greater than the dither rate. The P1 processor then synchronizes each sampled pulse count to a common sampling interval, thereby eliminating errors otherwise caused by using positional data values taken at different times. The P1 processor also compensates the ring laser gyro and accelerometer-produced signals at the sensor and the system level for effects such as temperature, bias offsets, scale factor and misalignment by the use of compensating coefficients stored in electrically erasable, programmable read-only memory. The processed data from the P1 processor are passed to a P2 processor which performs navigational computations to thereby produce computed positional information.
44 citations
05 Jun 2011
TL;DR: In this article, a hollow-disk pitch-and-roll resonant gyroscope has been developed to enable mode-matched operation at ∼ 0.9MHz in the presence of process non-idealities such as thickness variations of the SOI wafer.
Abstract: This paper reports on the design, fabrication, and characterization of a high-frequency single proof-mass dual-axis gyroscope. The hollow-disk pitch-and-roll resonant gyroscope has electrostatically tunable in-plane and out-of-plane resonance modes to enable mode-matched operation at ∼ 0.9MHz in the presence of process non-idealities such as thickness variations of the SOI wafer. A prototype device demonstrates x- and yaxis rate sensitivity of 127µV/deg/sec and 214µV/deg/sec, respectively. High quality factors (Q) of ∼ 10,000 are observed in vacuum for the in-plane drive and out-of-plane sense resonance modes. The device is implemented using a revised version of the HARPSS™ process, thereby enabling a single-chip tri-axial implementation when integrated with a yaw disk gyroscope.
43 citations
TL;DR: In this paper, the authors present a fully active-controlled He-Ne ring laser gyroscope operating in a square cavity having a side length of 1.35 m. The apparatus is designed to provide a very low mechanical and thermal drift of the ring cavity geometry and is conceived to be operative in two different orientations of the laser plane, in order to detect rotations around the vertical or the horizontal direction.
Abstract: We present a fully active-controlled He–Ne ring laser gyroscope operating in square cavity having a side length of 1.35 m. The apparatus is designed to provide a very low mechanical and thermal drift of the ring cavity geometry and is conceived to be operative in two different orientations of the laser plane, in order to detect rotations around the vertical or the horizontal direction. Since June 2010, the system is active inside the Virgo interferometer central area with the aim of performing high-sensitivity measurements of environmental rotational noise. So far, continuous unattended operation of the gyroscope has been longer than 30 days. The main characteristics of the laser, the active remote-controlled stabilization systems and the data acquisition techniques are presented. An offline data processing, supported by a simple model of the sensor, is shown to improve the effective long-term stability. A rotational sensitivity at the level of \(10^{-8}~\mathrm{rad}/\sqrt{\mathrm{Hz}}\) below 1 Hz, very close to the required specification for the improvement of the Virgo suspension control system, is demonstrated for the configuration where the laser plane is horizontal.
42 citations
TL;DR: The fiber-optic gyroscope was first investigated in the mid 70s, opening the way for a fully solid-state rotation sensor as mentioned in this paper, which was firstly seen as limited to medium-grade applications, but today, it reaches ultimate theoretical performance and surpasses its well-established competitor, the ring laser gyroscopic, in terms of bias noise and longterm stability.
Abstract: The fiber-optic gyroscope started to be investigated in the mid 70’s, opening the way for a fully solid-state rotation sensor. It was firstly seen as limited to medium-grade applications, but today, it reaches ultimate theoretical performance and surpasses its well-established competitor, the ring laser gyroscope, in terms of bias noise and long-term stability.
42 citations
TL;DR: In this article, the optical Kerr effect in a reciprocal fiber-optic Brillouin ring laser gyroscope was investigated, and it was found that the Kerr effect, as the major error source of the rotation rate measurement, causes a bias of beat frequency with nonlinear dependence on rotation rate.
Abstract: The optical Kerr effect in a reciprocal fiber-optic Brillouin ring laser gyroscope is investigated. It is found that the Kerr effect, as the major error source of the rotation rate measurement in this gyroscope, causes a bias of beat frequency with nonlinear dependence on rotation rate. A differential Stokes power of 1 mW inside the ring resonator is measured to produce a beat frequency bias of 69 Hz, which agrees well with the theoretical expectation. >
42 citations