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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03 Mar 2022
TL;DR: In this article , an optical gyroscope was built using an SiN racetrack resonator of 37mm perimeter with 1270 finesse (108 intrinsic quality factor) using off-the-shelf fiber components (circulators, splitters, and modulators) and a semiconductor laser to achieve an angular random walk (ARW) of 80 deg/h/Hz.
Abstract: Recent breakthroughs in silicon photonics technology may soon lead to mass-producible chip-scale tactical-grade (or better) gyroscopes by using a CMOS-compatible fabrication process to print highly integrated high-sensitivity optical gyroscopes. This paper reports our progress on designing and building an optical gyro out of an SiN racetrack resonator of 37-mm perimeter with 1270 finesse (108 intrinsic quality factor) using off-the-shelf fiber components (circulators, splitters, and modulators) and a semiconductor laser to achieve an angular random walk (ARW) of 80 deg/h/Hz, or 1.3 deg/h. To our knowledge, it is a record by a factor of 2 for the ARW per footprint area of a Sagnac-effect-based gyroscope on a chip. A balanced-detection scheme is employed to cancel 18 dB of gyroscope noise caused by laser phase noise converted into amplitude noise by residual backscatterers in the resonator. The backscattering coefficient was found to be very sensitive to wavelength, and therefore to the resonance used to probe the resonator. The lowest backscattering coefficient was measured to be more than 1,000 times lower than the mean. The use of this resonance, as well as an asymmetric phase-modulation scheme, greatly reduced the gyroscope’s backscattering noise. Achieving this gyro’s theoretical minimum ARW of 16 deg/h/Hz will likely require a lower backscattering coefficient or better means of cancelling backscattering noise. Further improvements to tactical-grade performance (and better) will likely require a larger resonator area, further reduction of backscattering, and/or a laser with reduced frequency noise.
2 citations
Patent•
05 Apr 2017
TL;DR: In this article, an improved signal acquisition circuit is proposed for laser gyro inertial navigation instrument and other laser inertial navigators. But the circuit is not suitable for the field of signal acquisition, as it suffers from low precision of the acquired signal, too large size and long filtering time.
Abstract: An improved signal acquisition circuit applied to the field of design of a laser gyro inertial navigation instrument and other laser inertial navigators. The signal acquisition circuit comprises a constant current source circuit, an I/F integrating circuit and a synchronizer and grating switch circuit, the constant current source circuit uses MAX6250 as a +5 V reference voltage source, and an operational amplifier OPA277U and peripheral devices can generate a reference voltage source. The constant current source circuit makes the signal acquisition circuit have a simple structure and a high output impedance. The above I/F converting circuit uses a voltage comparator LM339. The signal acquisition circuit overcomes the shortcomings of low precision of an acquired signal, too large size and long filtering time of existing laser gyro acquisition circuits, and has the advantages of improved anti-noise performance, improved acquisition precision and reduced circuit size.
2 citations
Journal Article•
TL;DR: In this paper, the rotation modulation technique is employed to improve the precision of inertial navigation system (INS) during long time operation, and the depression of RLG drift is analyzed theoretically based on autocorrelation function of first-order Markov random process.
Abstract: To improve the precision of inertial navigation system(INS) during long time operation,the rotation modulation technique is employed to modulate the errors of the inertial sensors into periodically varied signals,and,as a result,to suppress the divergence of INS errors.First,based on the measurement error model of inertial measurement unit(IMU),the principle of the rotation modulation technique is expounded.Then,first-order Markov random error model is introduced for the time-correlated random drift of ring laser gyro(RLG).And then,the depression of RLG drift using rotation modulation technique is analyzed theoretically based on autocorrelation function of first-order Markov random process.Finally,the simulation and test results are provided.The results indicate that the velocity and position errors,which are induced by time-correlated random drift of RLG,are about 1/40 of the errors without IMU rotation,and the position error of the INS is less than 1 nmile/48 h.It proves that the rotation modulation technique can modulate the time-correlated random drift of RLG effectively.
2 citations
TL;DR: A novel scheme for a fiber-optic heterodyne gyroscope produces two beat-photocurrent signals, including the Sagnac phase shift of opposite sign, which enables the phase-difference measurement of these signals to cancel their common phase factor but to obtain twice the SAGA phase shift.
Abstract: A novel scheme for a fiber-optic heterodyne gyroscope is proposed. This scheme produces two beat-photocurrent signals, including the Sagnac phase shift of opposite sign. The phase-difference measurement of these signals enables us to cancel their common phase factor but to obtain twice the Sagnac phase shift. The operation principle is verified experimentally.
2 citations