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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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Journal ArticleDOI
TL;DR: In this paper , a ring laser gyroscope (RLG) was used for rotational seismology, and the results showed that the long term stability was of the order of 3 nanorad/s and short term sensitivity was close to 2nanorad /s⋅Hz-1/2.
Abstract: We demonstrate that a middle sized ring laser gyroscope (RLG) can be a very sensitive and robust instrument for rotational seismology, even if it operates in a quite noisy environment. The RLG has a square cavity, 1.60×1.60m2, and it lies in a plane orthogonal to the Earth's rotational axis. The Fabry-Perot optical cavities along the diagonals of the square were accessed, and their lengths were locked to a reference laser. Through a quite simple locking circuit, we were able to keep the sensor fully operative for 14 days. We verified that the prototype properties are compatible with the seismic requirements. The obtained long term stability is of the order of 3 nanorad/s, and the short term sensitivity is close to 2nanorad/s⋅Hz-1/2. These results are limited only by the noisy environment; our laboratory is located in a building downtown.

1 citations

Patent
11 Jan 2019
TL;DR: In this paper, a laser gyroscope stepdown inertial navigation system is described, where a mounting framework is used for fixedly mounting three laser gyroscopes and three accelerometers, where the mounting frame is of a rectangular body-shaped structure in the aspect of outline.
Abstract: The invention discloses a laser gyroscope stepdown inertial navigation system The system comprises a mounting framework which is used for fixedly mounting three laser gyroscopes and 3 accelerometers,wherein the mounting frame is of a rectangular body-shaped structure in the aspect of outline; the middle positions of any three side surfaces of four side surfaces of the rectangular body-shaped structure in the horizontal circumferential direction are concave inwards and an X-direction laser gyroscope mounting groove, a Y-direction laser gyroscope mounting groove and an accelerometer mounting groove are formed in the middle positions; the accelerometer mounting groove is capable of containing and fixedly mounting the three accelerometers; and the middle position of any surface of the top surface and bottom surface of the rectangular body-shaped structure is concave inwards and a Z-direction laser gyroscope mounting groove is formed in the middle position The laser gyroscope stepdown inertial navigation system has the advantages of being ordered and concise in structure, small in volume, high in compactness and lighter in weight

1 citations

Patent
31 Mar 1988
TL;DR: In this article, a polyhedron having three facets (38, 40, 42) is used as a beam combiner for the gyroscope, and the directly measured beam intensity is then used to move a piezoelectric transducer.
Abstract: In a monolithic gyro assembly having three ring laser gyros, each measuring the inertial rotation of a shaft, a polyhedron (34) having three facets (38, 40, 42) is used as a beam combiner for the gyroscope. On one of the facets (40) is mounted an edge detector (26) which provides the gyroscope information related to the inertial rotation. On the other two facets (38, 42) on either side of the facet (40) of the edge detector are mounted control diodes (48, 46) of the power of the beam for measuring the intensity of the light beams respectively. The directly measured beam intensity is then used to move a piezoelectric transducer (12) and maintain constant path lengths for the gyroscope.

1 citations

Proceedings ArticleDOI
15 Dec 1978
TL;DR: In this paper, the Sperry SLIC 7 integrated laser gyro cluster is described in detail, and performance characteristics of the SLIC7 with supporting test data are presented, indicating that it is suited for a wide range of missile applications.
Abstract: A laser gyro design approach wherein three (or more) gyros are integrated into a common structure with interwoven optical cavities achieves size reductions in excess of 50% compared to the use of three. separate single axis gyros with the same optical cavity dimensions. This makes the laser gyro package size highly competitive with conventional gyros. Characteristics of laser gyro elements most suited for the integrated 3 axis design approach are discussed, and the Sperry SLIC 7 integrated laser gyro cluster is described in detail. Performance characteristics of the SLIC 7 with supporting test data are presented, indicating that the SLIC 7 is suited for a wide range of missile applications.

1 citations

Proceedings ArticleDOI
23 Mar 1988
TL;DR: In this paper, a formalism that unifies coherence, phase modulation, and dispersive propagation in Sagnac interferometers is presented, and several effects have been found as a result.
Abstract: A formalism is presented that unifies coherence, phase modulation, and dispersive propagation in Sagnac interferometers and is valid for large amplitude phase modulation. Several effects have been found as a result. For the fiber optic gyroscope, parasitic amplitude modulation effects that are maximum at the loop frequency have been found, in contrast to several effects that vanish when operating at the loop frequency. A correction to the gyroscope scale factor that is dependent on modulation amplitude and source bandwidth has also been found. In addition, there exists a maximum rotation rate limited by coherence effects, or maximum sensed phase shift for the Sagnac acoustic sensor. Phase noise effects caused by environmental or other disturbances can cause signal fade out and loss of information for the Sagnac data ring, and the magnitude of these effects are calculated. The Fm/Am conversion effect and its relevance for Sagnac interferometers is also treated. Finally, the use of a frequency shifting approach or various types of modulation to reduce these effects is discussed.

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202347
202275
202130
202062
201963
201841