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•
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23 Oct 1973
TL;DR: In this paper, an extremely simple gyroscope for use in a strapdown system having a vibrating ring as the gyroscopic element is described. But the ring is supported and vibrated by an electrostatic field established by a voltage supplied to case-fixed electrodes.
Abstract: An extremely simple gyroscope for use in a strapdown system having a vibrating ring as the gyroscopic element. The ring is supported and vibrated by an electrostatic field, established by a voltage supplied to case-fixed electrodes. An additional pair of fixed electrodes senses the position of the nodes of vibration of the ring and an eddy current drive forces rotation of the ring to move the nodes back to a reference position. Optical sensing means provide the pick-off, sensing the direction and amount of rotation required to move the ring back to the nodal reference position.
17 citations
TL;DR: Low noise and drift in a laser-driven fiber optic gyroscope (FOG) are demonstrated by interrogating the sensor with a low-coherence laser and this noise is below the requirement for the inertial navigation of aircraft.
Abstract: Low noise and drift in a laser-driven fiber optic gyroscope (FOG) are demonstrated by interrogating the sensor with a low-coherence laser. The laser coherence was reduced by broadening its optical spectrum using an external electro-optic phase modulator driven by either a sinusoidal or a pseudo-random bit sequence (PRBS) waveform. The noise reduction measured in a FOG driven by a modulated laser agrees with the calculations based on the broadened laser spectrum. Using PRBS modulation, the linewidth of a laser was broadened from 10 MHz to more than 10 GHz, leading to a measured FOG noise of only 0.00073 deg/√h and a drift of 0.023 deg/h. To the best of our knowledge, these are the lowest noise and drift reported in a laser-driven FOG, and this noise is below the requirement for the inertial navigation of aircraft.
17 citations
01 Jan 2006
TL;DR: Schreiber et al. as mentioned in this paper developed several very large perimeter ring laser gyroscopes for the application in geodesy and geophysics, which have a high resolution for angular velocities, a very good scale factor stability and a wide dynamic range.
Abstract: Over the last 40 years ring laser gyroscopes became one of the most important instruments in the field of inertial navigation and precise rotation measurements. They have a high resolution for angular velocities, a very good scale factor stability and a wide dynamic range. These properties made them suitable for aircraft and autonomous submarine navigation. Over the last decade we have developed several very large perimeter ring laser gyroscopes for the application in geodesy and geophysics (Schreiber et al., 2001). Because of a substantial upscaling of these ring lasers, their sensitivity to rotations has been increased by at least 5 orders of magnitudes. At the same time the instrumental drift was reduced by about the same amount. This progress in rotational sensor technology led to the successful detection of rotational signals caused by earthquakes (Pancha et al., 2000) several thousands kilometers away. These observations stimulated the development of a highly sensitive ring laser gyro for specific seismological applications. The GEOsensor provides rotational motions along with the usual translational motions at a high data acquisition rate of at least 20 Hz. Observations of seismic induced rotations show that they are consistent in phase and amplitude with the collocated recordings of transverse accelerations obtained from a standard seismometer over a wide range of distances and frequencies.
17 citations
Patent•
26 Apr 1991TL;DR: In this article, the phase bias of an optical branching/coupling unit is compensated by an electronic circuit, and an optical fiber loop is located in a heat insulation casing so as not to be affected by ambient temperature change, thereby to prevent the drift of the optical fiber gyroscope attributed to an temperature change.
Abstract: In an optical fiber gyroscope, the sensitivity thereof is optimized with a phase bias afforded by utilizing the phase characteristics of an optical branching/coupling unit. Further, the fluctuation of the intensity of a light source and the error and secular change of the phase characteristics of the optical branching/coupling unit are compensated by an electronic circuit. Moreover, an optical fiber loop is located in a heat insulation casing so as not to be affected by an ambient temperature change, thereby to prevent the drift of the optical fiber gyroscope attributed to an temperature change. Thus, the optical fiber gyroscope of high measurement accuracy is provided.
17 citations
Patent•
09 Aug 1979TL;DR: In this article, a ring laser gyroscope has a triangular optical resonator with mirrors at its corners, in order to prevent lock-in, a portion of the light from the beams that passes through the mirrors at the corners is fed back into the clockwise and counter-clockwise beams after being passed through a non-reciprocal phase shifter.
Abstract: In a ring laser gyroscope having a triangular optical resonator with mirrors at its corners, in order to prevent lock-in, a portion of the light from the beams that passes through the mirrors at the corners is fed back into the clockwise and counter-clockwise beams after being passed through an optical resonator containing a nonreciprocal phase shifter.
17 citations