Topic
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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Patent•
15 Oct 1991
TL;DR: In this article, an approach for stabilizing the position of the exciting electric component of a radio frequency electromagnetic field within the excited plasma of a ring laser, using two adjacent quarterwave coils, was proposed.
Abstract: Apparatus for stabilizing the position of the exciting electric component of a radio frequency electromagnetic field within the excited plasma of a ring laser, using two adjacent quarterwave coils, and driving the coils from a radio frequency source to ensure that the adjacent open ends of the two coils have electric field components that produce a steep gradient of electric field within the gas plasma of the ring laser.
3 citations
Patent•
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16 Aug 1984
TL;DR: In this article, a polygonal shape cavity was used to detect lock-in at low rates of rotation and a secondary dither was employed to eliminate nonlinearities in the gyro output when the input rate was a harmonic of the primary dither frequency.
Abstract: A laser gyro for detecting rates of rotating the gyro having a primary dither means for eliminating lock-in at low rates of rotation and a secondary dither means for eliminating nonlinearities in the gyro output when the input rate is a harmonic of the primary dither frequency The gyro includes a body having a polygonal shaped cavity therein with a mirror disposed at each of the corners thereof to form a closed loop path for two counter-rotating beams The primary dither includes means for dithering two mirrors 180 DEG out of phase to maintain the cavity path length constant The secondary dither includes a current dither for differentially modulating the current in each leg of the gyro to randomly null nonlinearities in the gyro output
3 citations
02 Oct 1984
TL;DR: In this paper, the lock-in band of a triangular ring laser gyro was reduced by dithering two flat diaphragm mirrors 180 degrees out of phase along their normals.
Abstract: We report here the successful reduction of the lock-in band of a triangular ring laser gyro by dithering two flat diaphragm mirrors 180 degrees out of phase along their normals. This causes a frequency shift of the backscattered light of each beam out of the capture band of the counterpropagating beam. After properly matching the phase and amplitudes of the mirror drives we obtained a residual lock-in roughly two orders of magnitude below the undithered value. A quantitative explanation of this result is given.
3 citations
01 Aug 2007
TL;DR: In this article, a micromachined vibratory gyroscope with two proof-masses to measure rotation rate is presented, and two proof masses are driven electrostatically in opposite directions along drive axis to generate differential Coriolis force detection.
Abstract: A micromachined vibratory gyroscope with two proof-masses to measure rotation rate is presented. The two proof-masses are driven electrostatically in opposite directions along drive axis to generate differential Coriolis force detection. In order to improve the performance of the MEMS gyroscope, an adaptive control method is developed. This scheme tunes the drive natural frequencies of gyroscope to a given frequency, regulates the amplitudes of the drive axis to a required value, achieves translational acceleration elimination, cancels out quadrature error due to stiffness coupling, and drives the sense axis vibration to zero for dynamic range and precision improvement. Simulation results verify the theoretical analysis.
3 citations
01 Feb 2010
TL;DR: A new method for gain stabilization using fuzzy-PID control algorithm is put forward, which can enhance the performance of RLG in application through adjusting the discharging current by optimized control algorithm in real time.
Abstract: The gain stability is an important factor to influence the performance of ring laser gyro (RLG). Traditional method is stabilizing the discharging current which has been proved to be incorrect by experiment. Based on the analysis of the physics essence of laser gain, this paper puts forward a new method for gain stabilization using fuzzy-PID control algorithm. Through adjusting the discharging current by optimized control algorithm in real time, the laser gain can be stabilized to a fixed value. The mathematic model of the control process is set up, and the concrete steps of the fuzzy-PID algorithm are given in detail. Simulation and experiments are carried out to test the performance of the system. The results show the RMS precision of laser gain and gyro drift can reach 2.6×10−5 and 4.47×10−3 respectively, indicating that the new method and its control algorithm are effective for gain stabilization, which can enhance the performance of RLG in application.
3 citations