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•
03 Nov 1993TL;DR: A pick-off device for a mechanical spinning gyroscope comprises the series arrangement of a piezo-electric crystal (18, 18') and a stiff spring (20, 20') between a stator (12) and a housing (10).
Abstract: of EP0567675A pick-off device for a mechanical spinning gyroscope comprises the series arrangement of a piezo-electric crystal (18, 18') and a stiff spring (20, 20') between a stator (12) and a housing (10) of the gyroscope. The piezo-electric crystal (18, 18') is subject to a high frequency oscillation with the frequency changing with the exerted force onto the piezo-electric crystal. This frequency change is used to indicate a measured angular rate.
19 Oct 2016
TL;DR: In this paper, the authors verified that a dynamic calibration technique can be achieved by SINS/LDV integrated system on the basis of the analysis of the software and hardware conditions.
Abstract: Taking the one-dimensional Laser Doppler Velocimeter (LDV) and a certain type of Laser Gyro Strapdown Inertial Navigation System (SINS) developed our staff room for object, the paper verifies that dynamic calibration technique can be achieved by SINS/LDV integrated system on the basis of the analysis of the software and hardware conditions. Extended Kalman filter states of SINS/LDV integrated system were chosen based on the error models of SINS and LDV. Using the difference of the output speed of the SINS and LDV as measurement, the error of bias and scale factor of the integrated navigation system are estimated effectively by setting up a reasonable calibration path. The effectiveness of the algorithm is further verified through the vehicular experiments. The results of experiments show that the dynamic calibration technique can be achieved through SINS/LDV integrated system and ensure the maneuverability of terrestrial inertial navigation system. The estimate of LDV scale factor is about 0.003%. The estimate error of accelerometer bias no more than 13μg. The estimate error of gyroscope drift no more than 1.7×10-3°/h. The yaw angle error is less than 0.19 ' within 20min.
Patent•
15 Sep 2017
TL;DR: In this article, a high pointing precision static angle measurement method for a scanning mirror is presented, where a high-precision gyroscope angle measurer is mounted and fixed on the scanning mirror spindle.
Abstract: The invention discloses a high pointing precision static angle measurement method for a scanning mirror; according to the method, a high-precision gyroscope angle measurer is mounted and fixed on a scanning mirror spindle, and under the action of a scanning controller, the high-precision gyroscope angle measurer and the scanning mirror are driven by a torque motor to synchronously move at uniform speed continuously under less than 1 DEG/s, and movement angle data of the scanning mirror under such speed is acquired; in measurement, both angle measurement data of a sensing synchronizer component and angle measurement data of a laser gyroscope are transmitted to a peripheral computer, the peripheral computer compares the two sets of angle measurement data, and the angle measurement data of the sensing synchronizer component is corrected through a suitable algorithm. The method of the invention has the advantages that data acquisition frequency may reach 2000 Hz and above, measurement range may reach 10 DEG and above, measurement precision may reach 0.3'' (3 sigma), test angle interval is 1.8'', and the pointing precision of the scanning mirror corrected reaches 0.5'' (3 sigma).
01 Jun 2020
TL;DR: The system for digital control of laser gyroscope mechanical dither making use for its operation of inertial sensor primary signals has been developed and tested and results received after the developed system being tested are represented.
Abstract: The system for digital control of laser gyroscope mechanical dither making use for its operation of inertial sensor primary signals has been developed and tested. The results received after the developed system being tested are represented.
TL;DR: In this paper, the amplitude of the output signal of a prisms laser gyro with mechanical dither bias is always modulated, and it is shown that the light transmitting route deviation caused by stress induced birefringence of prisms and the relative displacement between the photodetector and output light spot was the main reason responsible for the modulation.
Abstract: The amplitude of the output signal of prisms laser gyro with mechanical dither bias is always modulated. Theoretical analysis and experimental research on the ray trajectories, assembly situation and polarized properties of light were carried out. Results show that during the dither bias, the light transmitting route deviation caused by stress induced birefringence of prisms and the relative displacement between the photodetector and output light spot was the main reason responsible for the modulation. Polarized experiment data demonstrated that when the value of polarized power of output light below the 25.5% of that in ideal static situation, the standard error over 0.0337dBm, and the displacement extent of prism is higher than the 53% of radius of the beam waist in gyro cavity, the amplitude modulation extent of gyro output signal would be up to 16%, which badly influences measurement precision of laser gyro. Using the symmetric structure for laser gyro design, adopting prisms material with a suitable refractive index and reducing the photodetector deviation could reduce the extent of output signal's amplitude modulation obviously.