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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.


Papers
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Proceedings ArticleDOI
07 Mar 2014
TL;DR: In this paper, a new concept for the realization of a micro optical laser gyroscope was developed based on the use of double mirror elements in which the angle between the two mirrors is intrinsically defined by silicon crystals.
Abstract: A new concept for the realization of a micro optical laser gyroscope was developed. It allows minimization of the influence of alignment errors by the use of double mirrors. As a consequence, the performance of a ring resonator structure is less vulnerable to micro assembly tolerances. The idea being pursued to improve the design robustness is based on the use of double mirror elements in which the angle between the two mirrors is intrinsically defined by silicon crystalline structure. With an angle of 120° between the mirrors the resulting reflection direction from each double mirror element is robust against deviations from ideal incidence angle. Here, the optical distortions due to rotational misalignments of double mirror elements that occur either during assembly or during operation due to thermal stresses are extremely low and can be determined after production and compensated. After describing the free space ring resonator concept all major processing and manufacturing steps of the double mirror elements are discussed. For the fabrication of these mirrors silicon wafers are used which are almost in (100) orientation but are tilted by 5.3° in direction and, therefore, provide an etching facet with a slope of 60° by KOH wet chemical etching. A 33% KOH solution with addition of isopropanol is used to obtain more uniform and smooth facet surfaces. Two wafers structured in such way are connected by silicon direct bonding and then cut into small mirror elements which are mounted onto the gyroscope micro platform.

1 citations

Journal Article
TL;DR: In this paper, the authors analyzed the bandwidth properties of laser gyro and found that the laser has a wide theoretical bandwidth, and the factors affecting the actual bandwidth were analyzed and the bandwidth of the laser was tested in practice.
Abstract: The bandwidth property of the dynamic characteristics of laser gyro has been researched in this work.The bandwidth characteristics of laser gyro were analyzed firstly and revealed that the laser gyro had a wide theoretical bandwidth.Then the factors affecting the actual bandwidth were analyzed and the bandwidth of the laser gyro was tested in practice.The laser gyro was installed in an IMU body,using sine excitation method in the test.According to the predetermined frequency and amplitude,a sine excitation was applied to the angle vibration table and the signal outputs of the laser gyro and the angle vibration table were collected respectively.The obtained data from each frequency point were processed with FFT algorithm and the important conclusions were obtained.To deeply investigate the dynamic characteristics of laser gyro,two vibration tables were chosen through the tests,and two styles of rigid connection and connection with vibration isolator were used between IMU and the test tool.The test data indicates that the bandwidth of laser gyro is higher than 120 Hz,according with the theoretical analysis,and fully satisfies the bandwidth requirements of modern missiles for laser gyro.This test can be used as reference for laser gyro signal filtering and laser IMU system design.

1 citations

Patent
13 Jan 1993
TL;DR: In this article, a ring laser gyro system with at least one fixed mirror and two movable mirror assemblies was proposed to sinusoidally oscillate at the same amplitude and frequency, but 180° out of a phase with one-another, to eliminate lock-in.
Abstract: A ring laser gyro system having at least one fixed mirror (3,4), and two movable mirror assemblies (1,2), for causing a pair of laser beams to counter-rotate therebetween, including amplitude control circuits and a phase control circuit for causing the movable mirror assemblies (1,2) to sinusoidally oscillate at the same amplitude and frequency, but 180° out of a phase with one-another, to substantially eliminate lock-in.

1 citations

Patent
25 Nov 2015
TL;DR: In this paper, a high-precision angle measurement device based on a spatial four-frequency differential laser gyroscope and an installation calibration method for the high precision angle measurement was presented.
Abstract: The invention belongs to the technology of high-precision angle measurement, and relates to a high-precision angle measurement device based on a spatial four-frequency differential laser gyroscope, and an installation calibration method for the high-precision angle measurement device. The device comprises the spatial four-frequency differential laser gyroscope, a control circuit therefor, a high-speed control and collection circuit, and a computer. The spatial four-frequency differential laser gyroscope is disposed on a to-be-measured rotating shaft through a transition plate, and is connected with the high-speed control and collection circuit through the control circuit, wherein the high-speed control and collection circuit is connected with the computer. The device carries out the integration of an angular velocity component projected on a sensitive axis of the gyroscope, obtains the corresponding rotating angle information, then carries out the calibration of components of a calibration factor of the gyroscope and an inertial space angular velocity on the sensitive axis of the gyroscope, and finally calculates the rotation angle of the to-be-measured rotating shaft through measuring the number of pulses, outputted by the gyroscope, in the rotating process of the to-be-measured rotating shaft. The device is simple in installation, and has little crosslinking with the measured rotating shaft. The device is highly dividable in calibration factor, is high in angle measurement precision, is large in dynamic range, has no counter moment for a measured carrier, is small in temperature factor, does not affect the structure or composition of the measured load, and is better in practical application value.

1 citations

Journal Article
Teng Yunhe1
TL;DR: In this article, the authors used the Allan variance to analyse the stability of frequency in the time domain of ring laser gyro data, and the errors which exist in L 1 RLG were given.
Abstract: Errors of inertial navigation systems are mainly caused by the errors of the gyros. The evaluation and compensation of errors of gyros is an important way to improve the precision of gyros. It is necessary to build the random error model of gyros. Several methods can be used to analyse random error model of ring laser gyro (RLG), such as power spectrum density (PSD), ARMA, and Allan variance. Allan variance is a tool to analyse the stability of frequency in the time domain. There is quantitative relationship between Allan variance and power spectrum density of noise. Various kinds of ring laser gyro noise can be extracted from the gyro data with Allan variance. It is simpler than to analyse PSD in frequency domain. L 1 RLG was analysed with Allan variance, and the errors which exist in L 1 RLG were given. It is shown that Allan variance is a practical tool to build the random error model of ring laser gyros.

1 citations


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