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•
12 May 2020
TL;DR: In this article, an integral digital frequency stabilization method and device for a laser gyroscope is presented. But the method is not suitable for low-noise phase discrimination, and phase demodulation and low-pass filtering integral circuits are required.
Abstract: The invention relates to an integral digital frequency stabilization method and device for a laser gyroscope. According to the method and device, a DMA is triggered to control an ADC to collect a feedback signal sequence of one half of a small-jitter cycle when a small-jitter square wave edge is generated; the sum of the feedback signal sequences of the high-level half cycle of small-jitter square waves and the sum of the feedback signal sequences of the low-level half cycle of the small-jitter square waves are obtained respectively; and the sum of the feedback sequences of the low-level halfcycle is subtracted from the sum of the feedback sequences of the high-level half cycle, so that a phase discrimination result of the small-jitter cycle can be obtained; digital integration or smoothfiltering is performed on a plurality of adjacent phase discrimination results, so that a high-precision low-noise phase discrimination (integration) result can be obtained; and the increase and decrease of the voltage of frequency-stabilized signals are determined through the high-precision low-noise phase discrimination (integration) result. With the integral digital frequency stabilization method adopted, phase demodulation and low-pass filtering integral circuits required by the analog frequency stabilization of the laser gyroscope can be reduced, components are reduced, cost can be saved, and reliability is improved.
Journal Article•
TL;DR: The ring laser gyroscope as discussed by the authors consists of a ring laser having two independent counter propagating resonant modes over the same path; the difference in the frequencies is used to detect rotation.
Abstract: The ring laser gyroscope consists of a ring laser having two independent counter propagating resonant modes over the same path; the difference in the frequencies is used to detect rotation. It works on the principle of sagnac effect, which shifts the nulls of the internal standing wave pattern in response to angular rotation. Modeling of components such as base plate, dither ring, mirror, anode, cathode and sensor block is done and the final assembly of ring laser gyroscope is designed in CATIA software.
02 Oct 2009
TL;DR: In this paper, a micro gyroscope with decoupled and high linearity structure is proposed and simulated, which achieves complete decoupling between drive and sense modes to minimize the mechanical crosstalk.
Abstract: A novel micro gyroscope with decoupled and high linearity structure is proposed and simulated. The gyroscope is actuated by electrostatic force and detected by the lateral comb capacitors. The lateral comb capacitors have high linearity, improving the linearity of the gyroscope. The gyroscope achieves complete decoupling between drive and sense modes to minimize the mechanical crosstalk, thanks to the intermediate mass and decoupling beams. Drive and sense amplitudes, mechanical and electrical sensitivities and the quality factor are extracted analytically and results are confirmed using finite element analysis. The FEA using ANSYS shows drive and sense frequency of 4793Hz and 5150Hz respectively for only 3% mismatch in resonance frequency. The output signal achieves 20nm amplitude for 200 °/s input rotation rate at atmospheric environment, which results in 2.95aF linear change in the lateral comb capacitance.
Patent•
07 May 2019
TL;DR: In this article, a ring laser gyroscope with a helium-neon mixture was used to measure the pressure in annular laser gyroscopes during their production, and the pressure was determined from the calibration curve.
Abstract: FIELD: measuring equipmentSUBSTANCE: method of determining pressure in annular laser gyroscopes consists in the fact that in a ring laser gyroscope with a helium-neon mixture a short-time electric discharge is excited, operating current is set and radiation spectrum is recorded in the wavelength range from 500 nm to 600 nm, intensity of neon lines 5852 nm and helium 5875 nm is determined, neon line intensity ratio of 5852 nm to intensity of the helium line is calculated to be 5875 nm and pressure of the helium-neon mixture of the ring laser gyroscope is determined from the calibration curveEFFECT: increased efficiency and accuracy of measuring pressure of helium-neon mixture of ring laser gyroscopes during their production1 cl, 3 dwg
Patent•
08 Mar 2017
TL;DR: In this paper, a zero-offset magnetic field sensitivity testing method of a laser gyroscope and a magnetic zero-offense temperature compensating method of the laser were presented.
Abstract: The invention relates to a zero-offset magnetic field sensitivity testing method of a laser gyroscope and a magnetic zero-offset temperature compensating method of the laser gyroscope, and belongs to the field of inertial navigation, guidance and control. According to the zero-offset magnetic field sensitivity testing method disclosed by the invention, an original zero-offset magnetic field sensitivity testing method of the laser gyroscope is improved and supplemented, and the zero-offset magnetic field sensitivities of the laser gyroscope under different magnetic induction intensities and different temperature conditions can be reflected, so that the magnetic zero-offset performance of the laser gyroscope can be comprehensively evaluated; based on the zero-offset magnetic field sensitivity testing method, the invention provides the magnetic zero-offset temperature compensating method of the laser gyroscope, and magnetic zero offset of the laser gyroscope is compensated by utilizing the tested zero-offset magnetic field sensitivity characteristics of the laser gyroscope under different magnetic induction intensities and different temperature conditions, so that the performance requirements of the laser gyroscope under different temperatures and different electromagnetic working environments can be met, and the navigation accuracy of an inertial navigation system of the laser gyroscope can be increased.