Development of precision laser goniometer systems

Burnashev, M. N.; Pavlov, P. A.; Filatov, Yu. V.

doi:10.1070/qe2013v043n02abeh015045

Cited by 35 publications

(11 citation statements)

References 8 publications

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“…Curve 3 defines the systematic error of the optical encoder calculated by the Formula (13). The discrepancy between curves 1 and 2 is caused by a systematic error of ring laser, which can be found according to expression (12). Note that the amplitude of the systematic error of the ring laser at a constant external magnetic field depends on the rotation rate.…”

Section: Results Of Optical Encoder Calibration In the "On-axis" Modementioning

confidence: 94%

“…The main uncertainty of the LDG is due to the influence of an external magnetic field on the ring laser scale. The laser gyro has an axis of sensitivity to the magnetic field lying in the plane of the ring laser resonator [12]. During rotation, the sensitivity axis changes its orientation relative to the magnetic field lines of force, which leads to a systematic error at the first harmonic of the rotation frequency, provided that the magnetic field is uniform and constant.…”

Section: Reversal Methodsmentioning

confidence: 99%

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Precision Angle Measurement Systems on the Basis of Ring Laser Gyro

Filatov

Pavlov

Velikoseltsev

2020

Sensors

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The main application of a ring laser gyroscope is navigation. It is currently the most widely used device for strapdown inertial navigation systems. However, it is also applicable for high-precision angle metrology systems. This paper discusses the properties of a laser dynamic goniometer (LDG) based on the ring laser gyroscope and designed for the calibration of optical polygons and digital angle converters, and for the measurement of angles between external mirrors (theodolite operating mode). We consider the main sources of uncertainty, such as the ring laser gyro bias due to an external magnetic field and the instability caused by the velocity of rotation along with applicable methods of their compensation. The reversal method providing separation of uncertainties of the LDG and the calibrated angle converter is analyzed in detail. The simplified cross-calibration method is also considered. The results of calibration of optical encoders of various designs—with and without their own rotors (on-axis and off-axis in Euramet terminology)—are presented. Some results of the dynamic goniometer for the measurement of angles between external mirrors are presented. It is shown that the LDG in this mode of operation demonstrates better accuracy than modern theodolites and total stations.

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Section: Results Of Optical Encoder Calibration In the "On-axis" Modementioning

confidence: 94%

Section: Reversal Methodsmentioning

confidence: 99%

Precision Angle Measurement Systems on the Basis of Ring Laser Gyro

Filatov

Pavlov

Velikoseltsev

2020

Sensors

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“…Its typical resolution is limited to 0.1" (0.5 μrad) by the influence of the environmental parameters on the ring laser dynamics (birifrangency induced by spurious magnetic fields on the corner prisms, mechanical instabilities of the rotator, non-optimization of the geometrical parameters of the laser cavity). The resolution of the prototype active in St. Petersburg has been pushed down to 100 nrad through a careful (and quite cumbersome) analysis of all these systematic errors [10].…”

Section: Accuracy Of Rl Goniometermentioning

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 dynamic laser goniometer systems, 1 the scale of which is produced by the ring laser or an optical angle encoder (OAE), can be successfully used for calibration of the angle encoders, which are characterized by high accuracy and high speed of operation.…”

Section: Introductionmentioning

confidence: 99%

“…The dynamic laser goniometer systems, 1 the scale of which is produced by the ring laser, can be successfully used for calibration of the angle encoders. The ring laser operating in the mode of the angle measurement during its rotation has a number of undeniable advantages, such as high degree of uniformity and potential accuracy.…”

Section: Introductionmentioning

confidence: 99%

Dynamic goniometer for industrial applications

2016

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At the present time, there is a need for effective metrological control of the functional parameters of the modern rotary encoders due to their increased production level. This metrological control has to be carried out with high accuracy and high speed of operation. One of the most effective ways of solving this task is the use of dynamic goniometer (DG) jointly with an optical angle encoder and/or ring laser. The article deals with the principles of DG construction and considers the methods and results of DG investigation for the rotary encoder calibration as well as the elimination procedure of various types of DG uncertainties. The article shows that application of the proposed procedure allows to reduce the level of DG uncertainty to 0.2 arcsec, which ensures the uncertainty value of the rotary encoder metrological control by the means of DG to within 0.05 arcsec in a wide range of angular velocities. Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 07/02/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Optical Engineering 091405-2 September 2016 • Vol. 55(9) Ivaschenko, Pavlov, and Pukhova: Dynamic goniometer for industrial applications Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 07/02/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Development of precision laser goniometer systems

Cited by 35 publications

References 8 publications

Precision Angle Measurement Systems on the Basis of Ring Laser Gyro

Precision Angle Measurement Systems on the Basis of Ring Laser Gyro

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

Dynamic goniometer for industrial applications

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