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.

A self-clocked readout circuit for MEMS gyroscope to avoid frequency aliasing

Abstract: The performance of MEMS gyroscope is susceptible to the interface circuits. It is reported in the published literature that traditional interface circuits adopted modulation and demodulation technique to detect the signal of MEMS gyroscope. The frequencies of carrier waves are not sensitive to external environment which are created by an external crystal, while the resonant frequency of the gyroscope is sensitive to temperature. In this case, there will be frequency aliasing between the secondary demodulation signal and the vibrating gyroscope signal. The frequency aliasing may have a certain negative effect on zero-bias of MEMS gyroscope. In this paper, a self-oscillation loop in vibrating gyroscope was proposed based on the phase locked loop (PLL). This self-clocked interface circuit can track the primary frequency of gyroscope instead of an external crystal so that the negative effect caused by temperature changes can be almost eliminated. Comparison was made between the experimental results of traditional and improved PCB circuit, which proved that the frequency aliasing was almost solved and the results of simulation and experiment showed an obvious improvement on the zero-bias of gyroscope.

중급성능의 관성항법을 위한 소형 링레이저 자이로 설계 규격 연구

Abstract: In this paper, we present the requirements specification to develop the small ring laser gyroscope(RLG) which is applicable to the medium-grade inertial navigation system(INS) widely used as a main navigation system. To this end, first we analyse the performance specifications of RLG which is needed to configure the medium-grade INS and then we present the design results of RLG to meet the performance specifications, based on the overseas technology survey and the theoretical analysis. It is also shown in this paper what technology is required to develop a small RLC.

Ring Laser Gyro Program At Rockwell

Abstract: The potential promise of ring laser gyro technology for low cost strapdown inertial rate sensing has attracted very significant research and development investments. The results of these investments are now becoming available in a wide range of gyro products showing applicability to many sensing requirements. The Rockwell program in the ring laser gyro technology has been directed toward understanding of the basic limitations on sensor performance, particularly under severe environments, and development of a family of sensors for applications ranging from tactical missile guidance to inertial navigation systems and re-entry vehicle guidance. This paper described the progress toward these objectives and identifies the significant limitations in performance for the current sensor candidates.

Failure prediction of laser gyro based on neural network method

Abstract: During the storage and using process, laser gyroscope zero bias will drift due to influence of temperature, vibration and other environmental factors. This paper uses FMMEA method to analyze the reason for the variation of the laser gyros parameters. Using learning mechanisms of BP neural network to train the model with zero bias data and establish a relationship between zero bias value and the time. According to the given zero bias threshold and the acquired neural network model, fault time can be predicted. This paper also uses radial basis network and time series analysis to establish the reasoning algorithm between zero bias and laser gyro navigation fault. The results show that, for laser gyroscope zero bias data, neural network method has higher fitting precision than time series analysis, and can achieve good reasoning model, also the prediction is more close to the real fault time.

Advancement and expectations on mode-locked laser gyroscopes

Abstract: Laser gyroscopes afford extremely precise measurement of ultraslow angular velocity and play an irrefutable role in engineering seismology, tidal detection, aviation, aerospace, satellite navigation, and other inertial systems. With recent progress of mode-locked fiber lasers, particularly the realization of effective bidirectional generation, their applications in the fields of gyroscopic sensing have attracted tremendous attention. Besides the merits of excellent structure compactness, maintenance-free operation, and rather low cost, remarkably, the mode-locked laser gyroscope presents a promising approach for eliminating the lock-in effect caused by the synchronization of counterpropagating resonant frequencies, which is the most severe sensing limitation of traditional laser gyroscopes. In this paper, recent advancements and perspectives in this research are reviewed. The fundamentals of gyroscopic sensing employing mode-locked pulse lasers are presented. Architectures of novel mode-locked laser gyroscopes inspired by ultrafast optics, including bright-soliton mode-locked laser gyroscopes and dark-soliton mode-locked laser gyroscopes, are described in detail. Bottlenecks and deficiencies of the exhibited mode-locked laser gyroscopes owning to inherent physical mechanisms or measurement methods currently used are further analyzed. Finally, feasible methods of improving the performance of mode-locked laser gyroscopes are broadly expounded upon to build a bridge between their scientific development research and practical applications.