A method of eliminating the influence of magnetic field in a dynamic laser goniometer linear and angular measurements

Ivashchenko, E. M.; Pavlov, P. A.

doi:10.1007/s11018-012-0099-4

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…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. Let us consider the reverse method [10], which is used to separate the uncertainties of the ring laser from the encoder in order to reduce the measurement error. The calibration of the encoders on a LDG has to exclude the systematic error of the ring laser itself.…”

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: Reversal Methodsmentioning

confidence: 99%

“…The main algorithm of the angle measurement (φ i ) in dynamic laser goniometry is based on the principle of self-calibration, when during the measurement process, the "price" for the division of the ring laser angular scale is determined. The algorithm is defined by the expression [10]:…”

Section: The Main Error Sources Of An Ldgmentioning

confidence: 99%

Precision Angle Measurement Systems on the Basis of Ring Laser Gyro

Filatov

Pavlov

Velikoseltsev

2020

Sensors

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“…3. The function of the angle encoder can be performed by any position angle encoders, such as the optical polygon with the null indicator (a device generating an electrical pulse at the moment of time when the normal to the face of the optical polygon is aligned with its optical axis), the photoelectric incremental angle encoder, the photoelectric encoder, the inductosyn, and so on.…”

Section: Methods Of the Dynamic Goniometer Studymentioning

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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Investigations of Dynamic Goniometers with Optical Angle-Data Transmitter

Ivashchenko¹,

Pavlov²

2014

Meas Tech

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A method of eliminating the influence of magnetic field in a dynamic laser goniometer linear and angular measurements

Cited by 7 publications

References 4 publications

Precision Angle Measurement Systems on the Basis of Ring Laser Gyro

Precision Angle Measurement Systems on the Basis of Ring Laser Gyro

Dynamic goniometer for industrial applications

Investigations of Dynamic Goniometers with Optical Angle-Data Transmitter

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