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.

Method of increasing reliability of ring laser gyroscopes

Abstract: FIELD: physics.SUBSTANCE: ring laser gyroscope is placed on a vacuum post, pumped to a high vacuum, the tightness is checked. The internal volume of the resonator is cleaned by repeating three times the sequence of operations: filling with oxygen, burning in the discharge of oxygen, pumping out. Then the following sequence of operations is repeated three times: filling the resonator with a mixture of oxygen with neon, burning in the discharge of these gases, pumping out, then degassing the getters installed in the gyroscope. Cool screens are installed on the electrodes of the ring laser gyroscope and connected to a coolant or gas supply system. The gyroscope housing with the installed screens is heated to the temperature of 260°C, with a constant supply of cooling liquid or gas, degassing for 48 hours and after cooling to the temperature of 50-60°C threefold filling of the working helium-neon mixture, operating and pumping are performed. Then, the getters are activated, the helium-neon mixture is filled to the working pressure, the electrical parameters are measured, and the sealing is performed.EFFECT: increasing the reliability of ring laser gyroscopes by increasing the tightness of the indium compound of the glass-ceramic housing with gold-plated anodes and increasing the efficiency of degassing the internal volume of the ring laser gyroscope from sorbed impurity gases.3 dwg

Design and simulation of micromachined gyroscope

Abstract: In this paper a MEMS vibrating rate gyroscope design based on previous work [1] was analyzed to get its mechanical characteristics. In this design, bended beams were used for the inner and outer structures. Electrostatic force is applied on the comb drive electrodes of the gyroscope to create motion in the drive mode direction. The excitation of the gyroscope's drive mode and the deflection of the inner mass due to Coriolis force is simulated using ANSYS FEA software. The simulation results show resonance frequencies of 3769 Hz for the drive mode and 3661 Hz for the sense mode, maximum displacement of 5.07 µm in drive mode and 6.89nm in sense mode, the mechanical sensitivity is 0.00689 µm/ (o/s), and the frequency mismatch of 2.86%.

Rotation and acceleration sensor based on nondegenerate ring lasers

Abstract: Ring laser gyroscopes, in which rotation is detected by the Sagnac effect between counterpropagating lasers, are in common use in navigation applications. The invention disclosed here uses lasers operating at different frequencies; the resulting device is referred to as a Nondegenerate Ring Laser Gyroscope (NRLG). The invention disclosed here also incorporates an acceleration-sensing element that modifies the path length of the ring lasers in the gyroscope, the effects of which on the output of the gyroscope can be separated from those of rotation. The resulting composite device is a Nondegnerate Ring Laser Gyroscope/Accelerometer (NRLGA).

A heterodyne frequency-stabilization method for large ring laser gyroscopes with Sub-nW output power

Abstract: We present the characteristics and the performances of a heterodyne detection scheme allowing a robust frequency lock of the G-Pisa ring laser [1,2] to a He-Ne Doppler shift stabilized reference laser. The system demonstrated a continuous unattended control of the laser frequency for several days of operation of the gyroscope with a single mode output power of about 500 pW.