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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24 Mar 1983TL;DR: In this paper, a fiber optic gyroscope comprising a Sagnac interferometer including a (3×3) optical directional coupler is driven with an essentially unpolarized broadband spatially coherent light beam supplied by a super-luminescent diode source.
Abstract: A fiber optic gyroscope comprising a Sagnac interferometer including a (3×3) optical directional coupler. The gyroscope is driven with an essentially unpolarized broadband spatially coherent light beam supplied by a super-luminescent diode source. A significant reduction in baseband noise occurs due to the use of the essentially unpolarized light beam.
27 citations
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TL;DR: A fiber optic gyroscope different from the standard concept is presented, wherein a fused fiber 3 x 3 directional coupler provides a constant phase shift thus enabling the detection of rotation rate at the quadrature point without phase modulation.
Abstract: A fiber optic gyroscope different from the standard concept is presented. A fused fiber 3 x 3 directional coupler provides a constant phase shift thus enabling the detection of rotation rate at the quadrature point without phase modulation. Bias errors due to birefringent coupling centers in the fiber coil are avoided by using an unpolarized light source. A contrast insensitive signal recovery scheme eliminates the influence of polarization fluctuations on the scale factor. First measurements with a prototype gyroscope (90 mm in diameter and 23 mm in height) show a bias stability of <4.7 degrees /h and scale factor accuracy of <0.1% in the range of +/-200 degrees /s.
26 citations
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TL;DR: In this paper, a fully decoupled z-axis MEMS gyroscope with wide bandwidth and high linearity is presented, which is employed to lower the mechanical cross coupling between the drive mode and sense mode.
Abstract: A fully decoupled z -axis MEMS gyroscope with wide bandwidth and high linearity is presented in this paper. The mechanical structure consists of a dual proof mass, which are mechanically coupled together using a pair of double folded springs. The fully decoupled approach is employed to lower the mechanical cross coupling between the drive mode and sense mode. The gyroscope is fabricated using a simple two-mask process based on a silicon-on-insulator (SOI) substrate with a 30-μm-thick device layer. The electrostatic actuation and capacitive sensing gaps of around 1.1-μm provide an aspect ratio of close to 27. The narrow capacitive gap increases the electromechanical coupling and improves the signal to noise ratio (SNR) of the sensor. The fabricated MEMS gyroscope is vacuum packaged in a ceramic chip carrier in order to minimize the Brownian noise floor for achieving a better performance. A off-the-shelf integrated circuit with the excitation and sensing electronics is hybrid connected to the gyroscope. The MEMS gyroscope system demonstrates a bias instability of 9.6 deg/h, an angular random walk (ARW) of 0.45 deg/ h , a bandwidth of greater than 120 Hz, and a scale-factor nonlinearity of 770 ppm in a full scale range of ±500 deg/s at room temperature.
26 citations
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TL;DR: In this article, the Sagnac interferometer is used as a loop reflector with a modulated reflectivity to produce actively mode-locked optical pulses, and the rotation-induced phase shift is obtained from the timing shift of the pulses.
Abstract: We describe a new form of an all-fiber-optic gyroscope that utilizes a fiber laser. The Sagnac interferometer is used as a loop reflector with a modulated reflectivity to produce actively mode-locked optical pulses. The rotation-induced phase shift is obtained from the timing shift of the pulses. Experimental results compare well with the theoretical predictions.
26 citations
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TL;DR: In this article, the impact of cubic nonlinearity on the operation of a rate-integrating gyroscope (RIG) is investigated and a method of compensating for angle-dependent frequency error is proposed and experimentally validated.
Abstract: This paper addresses the impact of cubic nonlinearity on the operation of a rate-integrating gyroscope (RIG). It is demonstrated that below the bifurcation threshold, cubic nonlinearity results in angle-dependent frequency split between the two resonant modes of the gyroscope, which impacts angle-dependent bias, quadrature error, and controller efficacy in addition to distorting the scale factor due to off-resonant excitation. These errors are experimentally demonstrated using a high- $Q$ disk resonator gyroscope, which are shown to be in close agreement with theory. A method of compensating for angle-dependent frequency error is proposed and experimentally validated. It is demonstrated that mode mismatch can be experimentally reduced to the level of thermal noise, effectively cancelling the effects of nonlinearity and eliminating the distortion of readout angle.
26 citations