Dynamic angle measurement by means of a ring laser

Filatov, Yu. V.; Loukianov, D. P.; Probst, Rafael A.

doi:10.1088/0026-1394/34/4/7

Cited by 47 publications

(21 citation statements)

References 9 publications

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“…Modern Ring Lasers gyroscopes (RL) based on the Sagnac effect are standard inertial sensors of rotation rates with many applications, ranging form inertial guidance [1], to angle metrology [2], geodesy [3,4], and geophysics [4,5]. Their application to General Relativity tests has also been recently considered [6] as in the GIN-GER proposal (Gyroscopes In General Relativity), an underground experiment on the detection of the dragging of the inertial frame (Lense-Thirring effect) due to the Earth rotation.…”

Section: Introductionmentioning

confidence: 99%

Controlling the non-linear intracavity dynamics of large He–Ne laser gyroscopes

et al. 2014

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A model based on Lamb's theory of gas lasers is applied to a He-Ne ring laser gyroscope to estimate and remove the laser dynamics contribution from the rotation measurements. The intensities of the counter-propagating laser beams exiting one cavity mirror are continuously observed together with a monitor of the laser population inversion. These observables, once properly calibrated with a dedicated procedure, allow us to estimate cold cavity and active medium parameters driving the main part of the nonlinearities of the system. The parameters identification and noise subtraction procedure has been verified by means of a Monte Carlo study of the system, and experimentally tested on the G-PISA ring laser oriented with the normal to the ring plane almost parallel to the Earth rotation axis. In this configuration the Earth rotation-rate provides the maximum Sagnac effect while the contribution of the orientation error is reduced at minimum. After the subtraction of laser dynamics by a Kalman filter, the relative systematic errors of G-PISA reduce from 50 to 5 parts in 10 3 and can be attributed to the residual uncertainties on geometrical scale factor and orientation of the ring.

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Section: Introductionmentioning

confidence: 99%

Controlling the non-linear intracavity dynamics of large He–Ne laser gyroscopes

et al. 2014

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“…Up today, the only existing goniometer based on RL gyroscope is the apparatus EUP-1L, developed at the St. Petersburg Electrotechnical University [2]. The ring laser consists in a Zerodur monolithic cavity 44 cm in perimeterlength, equipped with total reflection prisms in optical contact with the cavity frame [9].…”

Section: Accuracy Of Rl Goniometermentioning

confidence: 99%

“…It consists in a monolithic RL, 11 cm in side-length, mounted on a turntable. The RL is equipped with total reflection prisms in optical contact with a Zerodur cavity frame [2]. The typical resolution of this instrument is at the level of 100 nrad, limited by the errors due to the influence of environmental parameters on the ring laser dynamics.…”

Section: Introductionmentioning

confidence: 99%

Planar angle metrology: G-LAS, the INRIM - INFN ring laser goniometer

Belfi

Beverini

Virgilio

et al. 2016

2016 European Frequency and Time Forum (EFTF)

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Precision mechanical industry, geodetic measurements, astronomy and experimental physics require accurate measurement of angles down to the nanoradian level. A collaboration between INRIM and INFN is developing a new transportable goniometer (G-LAS, GyroLaser Angular Standard) that makes use of a ring laser gyroscope mounted on a precision turntable with a target accuracy of 10 nrad, being the accuracy of the most precise existing angular encoders at the level of some 100 nrad. The apparatus will consist in a square optical cavity of about 0.5 m in side, equipped with the last generation dielectric super-mirrors that are employed in the large gyroscopes for application in seismology and geodesy

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“…The misalignment error Eo.n in (8) is the rotation of the misalignment, i. e. , EO , n = 4>0 (9) where 4>0 is an unknown constant which will be computed with mathematical manipulation in the following.…”

Section: A Viewmentioning

confidence: 99%

“…Researchers and engineers have devoted a lot of efforts to the design of the standards to build angle comparators, such as polygon mirrors with photo electric auto-collimators [6], [7], index table with laser inter ferometer [8], and ring-laser based goniometer [9]. However, these existing angle comparators cannot be directly used to calibrate the angular stage error without serious modification of the uncalibrated metrology stages [10].…”

Section: Introductionmentioning

confidence: 99%

A novel on-axis self-calibration approach for precision rotary metrology stages

Zhu

et al. 2013

2013 IEEE/ASME International Conference on Advanced Intelligent Mechatronics

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Ahstract-Precision rotary metrology stages need calibration technology to determine the stage error for improvement of angle measurement accuracy. In this paper, we study the calibration of precision rotary metrology stages, and present an on-axis angle self-calibration approach different from previous perspectives. Without resorting to specially designed angle com parators or added read-heads, the proposed scheme fully utilizes different measurement views of a newly designed artifact plate on the uncalibrated rotary stage. The measurement deviation of each mark line from its nominal angle position, is rigidly modeled as the combination of stage error, artifact error, misalignment error and random measurement noise. Based on the circle closure principle and mathematical definition of the axis orientation, the misalignment error of each measurement view can be directly determined by rigid algebraic processing. A least-square based calculation law is finally synthesized to determine the stage error. Computer simulation validates that the proposed method can realize the stage error accurately even there exist various random measurement noises. Finally, a practical description on how to measure the angular marks of different measurement views is provided. The proposed strat egy essentially provides a novel on-axis angle self-calibration principle with accuracy, simplicity and robustness orientation to meet industrial requirements.978-1-4673-5320-5/13/$31.00 ©2013 IEEE

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Dynamic angle measurement by means of a ring laser

Cited by 47 publications

References 9 publications

Controlling the non-linear intracavity dynamics of large He–Ne laser gyroscopes

Controlling the non-linear intracavity dynamics of large He–Ne laser gyroscopes

Planar angle metrology: G-LAS, the INRIM - INFN ring laser goniometer

A novel on-axis self-calibration approach for precision rotary metrology stages

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