Large ring laser gyroscopes: towards absolute rotation rate sensing

2015 ◽  
Author(s):  
Robert B. Hurst ◽  
Nishanthan Rabeendran ◽  
Jon-Paul R. Wells ◽  
K. Ulrich Schreiber
Keyword(s):  
Rotation Rate ◽  
Ring Laser ◽  
Large Ring ◽  
Laser Gyroscopes

scholarly journals Rotation Sensing Lasers in General Relativity: Some Technical Notes and Current Advances

Universe ◽  
2019 ◽  
Vol 5 (9) ◽  
pp. 190 ◽  
Author(s):  
K. Ulrich Schreiber ◽  
André Gebauer ◽  
Jan Kodet ◽  
Caroline L. Anyi ◽  
Jon-Paul R. Wells
Keyword(s):  
General Relativity ◽  
Rotation Rate ◽  
Ring Laser ◽  
Laser System ◽  
Physical Models ◽  
Current Status ◽  
Rotation Sensing ◽  
General Relativistic ◽  
Laser Gyroscopes

We review the current status of large ring laser gyroscopes having the potential to contributeto terrestrial measurements of general relativistic precessions. At this point in time, although thesedevices possess the raw sensitivity for such a measurement, they remain limited by long-term geometricinstability, detection noise and imperfections in the physical models required to isolate geophysicaleffects. Furthermore, minute non-reciprocal biases provide a null-shift error and therefore no currentlyconstructed laser system meets the requirement of absolute rotation rate sensing. Nevertheless, we are ofthe view that these are surmountable problems and the ability of ring laser gyroscopes to measure lowfrequency to DC signals has vastly increased in the last decade.

High-accuracy absolute rotation rate measurements with a large ring laser gyro: establishing the scale factor

2017 ◽  
Vol 56 (4) ◽  
pp. 1124 ◽  
Author(s):  
Robert B. Hurst ◽  
Marinus Mayerbacher ◽  
Andre Gebauer ◽  
K. Ulrich Schreiber ◽  
Jon-Paul R. Wells
Keyword(s):  
Rotation Rate ◽  
Ring Laser ◽  
High Accuracy ◽  
Scale Factor ◽  
Laser Gyro ◽  
Large Ring

scholarly journals High-Accuracy Ring Laser Gyroscopes: Earth Rotation Rate and Relativistic Effects

2016 ◽  
Vol 723 ◽  
pp. 012061 ◽  
Author(s):  
N Beverini ◽  
A Di Virgilio ◽  
J Belfi ◽  
A Ortolan ◽  
K U Schreiber ◽  
...  
Keyword(s):  
Rotation Rate ◽  
Earth Rotation ◽  
Ring Laser ◽  
Relativistic Effects ◽  
High Accuracy ◽  
Laser Gyroscopes

A Comparison of Beat Frequency Estimation Methods for Large Ring Laser

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Jailos Mrisho Nzumile ◽  
Keyword(s):  
Real Time ◽  
Noise Level ◽  
Ring Laser ◽  
Frequency Estimation ◽  
Low Noise ◽  
Estimation Methods ◽  
Acquisition Rate ◽  
Large Ring ◽  
True Value ◽  
Output Characteristics

Autoregressive (AR2) technique has always been used to estimate frequency of the output signal from Large ring laser. However, the acquisition rate is not at near real time which is the requirement and noise level still challenge the process resulting to errors in the final estimation. A research was done to compare the Autoregressive (AR2) with the counterparts such as Pisarenko, Quinn, Hilbert and Phase looking for a better technique that will estimate the frequency at near real time to minimize errors. Secondary data from G and C – II ring laser were used during the comparison between the techniques and Autoregressive (AR2). Results shows that, the output characteristics from the counterpart does not depict the oscillations of the Earth rotation as expected contrast to that of Autoregressive (AR2) which does. Moreover, there were much deviation from the expected true value for the techniques contrast to that of AR2 which is very minimum. On the other hand, when the C – II data were used, it was observed that both techniques resemble on their output characteristics though AR2 was still better in the acquisition rate expect for Hilbert transform which does not resemble with others. Following the scope of this paper, Autoregressive (AR2) technique still emerge as a favorite frequency estimation technique contrast to the four counterparts due to its robustness, high acquisition rate as well as low noise level.

Research on Thermal Performance for Resonator of Mechanically Dithered Ring Laser Gyroscopes

2014 ◽  
Vol 51 (5) ◽  
pp. 051405
Author(s):  
兰佩锋 Lan Peifeng ◽  
刘元正 Liu Yuanzheng ◽  
王继良 Wang Jiliang ◽  
徐宏财 Xu Hongcai
Keyword(s):  
Thermal Performance ◽  
Ring Laser ◽  
Laser Gyroscopes

AUTOREGRESSIVE ANALYSIS FOR THE DETECTION OF EARTHQUAKES WITH A RING LASER GYROSCOPE

2001 ◽  
Vol 01 (01) ◽  
pp. R41-R50 ◽  
Author(s):  
DUNCAN P. McLEOD ◽  
B. TOM KING ◽  
GEOFFREY E. STEDMAN ◽  
K. ULRICH SCHREIBER ◽  
TERRY H. WEBB
Keyword(s):  
Phase Angle ◽  
Ring Laser ◽  
Seismic Waves ◽  
P Wave ◽  
Quantum Limit ◽  
S Wave ◽  
Large Ring ◽  
Rotational Components ◽  
Ring Laser Gyroscope ◽  
Laser Gyroscope

The second-order autoregressive AR(2) model is used to analyze rotational data for seismic events captured by a large ring laser gyroscope. Both the Sagnac frequency and linewidth estimates obtained from this model sense the rotational components of seismic waves. An event of magnitude M L = 6.5 at a distance of D = 5.4° from a large ring laser gyroscope operating at its quantum limit is used to compare the AR(2) model with the previous analytical phase angle method of analysis. The frequency, linewidth and analytic phase angle data each satisfactorily estimate the rotation magnitude. The direct detection of rotational motion in the P wave coda is observed, demonstrating the conversion to transverse S wave polarizations by the local geology.

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