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.

A novel progressive wave gyroscope based on acousto-optic effects

Abstract: Abstract We propose and numerically investigate a brand-new, high-sensitivity progressive wave gyroscope based on acousto-optic effects for the measurement of rotational angular velocity. Unlike the traditional surface acoustic wave (SAW) gyroscope, which uses shifts in the SAW frequency to characterize the rotational angular velocity, this study uses acousto-optic effects to detect changes in refractive index caused by mechanical strain, measuring the angular velocity by the output optical power intensity of the optical waveguide. The three-dimensional finite element analysis method is utilized to build an SAW excitation model and optical detection model. We show that the sensitivity of the SAW gyroscope is highly dependent upon geometric parameters of the structure and that the mechanical strain induced by the progressive wave of the SAW can be effectively measured by the optical power intensity under the action of external angular velocity. The superiority of the proposed structure is substantiated by its achievement of a theoretical sensitivity of 1.8647 (mW/m 2 )/(rad/s) and high impact resistance of 220,000 g. By means of normalization, the sensitivity of the proposed structure can be enhanced by four orders of magnitude compared to the traditional SAW gyroscope. The novel structure combines the advantages of both conventional microscale vibrating gyroscopes and optical gyroscopes, providing a powerful solution for performance enhancement of SAW gyroscopes and, thereby, enabling application in the field of inertial devices.

A novel progressive wave gyroscope based on acousto-optic effects

Abstract: Abstract We propose and numerically investigate a brand-new, high-sensitivity progressive wave gyroscope based on acousto-optic effects for the measurement of rotational angular velocity. Unlike the traditional surface acoustic wave (SAW) gyroscope, which uses shifts in the SAW frequency to characterize the rotational angular velocity, this study uses acousto-optic effects to detect changes in refractive index caused by mechanical strain, measuring the angular velocity by the output optical power intensity of the optical waveguide. The three-dimensional finite element analysis method is utilized to build an SAW excitation model and optical detection model. We show that the sensitivity of the SAW gyroscope is highly dependent upon geometric parameters of the structure and that the mechanical strain induced by the progressive wave of the SAW can be effectively measured by the optical power intensity under the action of external angular velocity. The superiority of the proposed structure is substantiated by its achievement of a theoretical sensitivity of 1.8647 (mW/m 2 )/(rad/s) and high impact resistance of 220,000 g. By means of normalization, the sensitivity of the proposed structure can be enhanced by four orders of magnitude compared to the traditional SAW gyroscope. The novel structure combines the advantages of both conventional microscale vibrating gyroscopes and optical gyroscopes, providing a powerful solution for performance enhancement of SAW gyroscopes and, thereby, enabling application in the field of inertial devices.

Method and apparatus for determining absolute angular velocity

Abstract: A method and apparatus for determining an absolute angular velocity of a vehicle that rotates during operation about an axis of rotation. The vehicle includes a vehicle body and a gyroscope rotatably mounted on the body for rotation with respect to the body about a gyroscope axis generally aligned with the axis of rotation. The gyroscope is rotated with respect to the vehicle body about the gyroscope axis in a direction opposite to rotation of the vehicle so an absolute angular velocity of the gyroscope about the gyroscope axis tends to remain about zero. A rotational speed of the gyroscope is measured about the gyroscope axis with respect to the vehicle body. The rotational speed of the gyroscope corresponds to the absolute angular velocity of the vehicle about the axis of rotation.

Noise rejection during mode-locking in a solid-state laser gyroscope based on YAG:Cr 4+

Abstract: A solid-state laser gyroscope based on YAG:Cr4+ operating in the mode-locking regime presents in this paper. The physical mechanisms of noise rejection and coupling reducing of counter propagating waves in the gyroscope during mode locking are analyzed. The conditions for stable bi-directional generation are determined.