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.

Ring laser gyro with optically independent semiconductor ring lasers

Abstract: A semiconductor ring laser gyro comprising two or more ring lasers, the ring lasers being optically independent of each other, is characterized in that a change in beat frequency with respect to a change in angular velocity of a first ring laser is opposite to that of a second ring laser, and angular velocity of rotation of the gyro is detected by a signal representing a difference between a first beat frequency generated by the first ring laser and a second beat frequency generated by the second ring laser.

Ring laser gyroscope with fiber optic beam combiner

Abstract: An electromechanically dithered ring laser gyroscope includes a beam combiner utilizing optical fibers instead of conventional optics. This permits a beam measuring photodetector and associated electronics to be positioned outside the gyroscope or its enclosure. The invention further includes a dither compensator using optical fibers thereby replacing sensitive electronic or optical dither compensating components.

High-precision dynamic angle measuring device and method

Abstract: The invention belongs to the technical field of high-precision angle measurement, and relates to a high-precision dynamic angle measuring device and method. The high-precision dynamic angle measuring device comprises a spacial four-frequency differential laser gyro, a flexible cable, a gyro control/demodulator circuit, a round inductosyn, an inductosyn demodulator circuit, an angle increment signal processing circuit, a connection bus, and an angle measuring computer. In the high-precision dynamic angle measuring method, the measured inertia spacial angular speed projection component on the sensitive axis of spacial four-frequency differential laser gyro is utilized to precisely obtain the inertia spacial angular speed component on the gyro sensitive axis in the current position by using an interpolation method according to the angular position output of the round inductosyn; moreover, in the gyro output, the current inertia spacial angular speed component is eliminated, and thus the angle measurement precision is largely improved. For the output of spacial four-frequency differential laser gyro, the angular speed integral time can reach the microsecond level. A spacial four-frequency differential laser gyro with a scale coefficient, which can be highly segregated, is adopted; and the provided device and method have the advantages of high angle measurement precision, large dynamic range, no counter-torque effect on measure carrier, small temperature coefficient, and good practical application value.

Super-large optical gyroscopes for applications in geodesy and seismology: state-of-the-art and development prospects

Abstract: A brief survey of the history of the invention and development of super-large laser gyroscopes (SLLGs) is presented. The basic results achieved using SLLGs in geodesy, seismology, fundamental physics and other fields are summarised. The concept of SLLG design, specific features of construction and implementation are considered, as well as the prospects of applying the present-day optical technologies to laser gyroscope engineering. The possibilities of using fibre-optical gyroscopes in seismologic studies are analysed and the results of preliminary experimental studies are presented.

Ring laser gyroscope curved blade flexure and support ring assembly and method

Abstract: A dither flexure for a ring laser gyroscope includes a central portion and a plurality of curved vanes extending therefrom to connect to a flexure ring. The flexure ring includes a boss in a central portion thereof. A glass ceramic ring having a pair of end bosses is bonded to the boss around the flexure ring with the end bosses facing outward toward the ring laser gyroscope frame. The end bosses contact the ring laser gyroscope frame so that a void is formed opposite the flexure ring boss, which prevents transmission of radially directed stresses from the dither flexure to the frame. The curved blades have high resistance to off-axis vibrations and have high off-axis resonant frequencies so that very little coning and axis sag occur. Each blade has a curved portion and a straight portion, which provides a convenient location for mounting piezoelectric drive elements for dithering the ring laser gyroscope.