Measuring the refractive index on a goniometer in the dynamic regime

Vishnyakov, G. N.; Левин, Г. Г.; Kornysheva, S. V.; Zyuzev, G. N.; Lyudomirskii, M. B.; Pavlov, P. A.; Filatov, Yu. V.

doi:10.1364/jot.72.000929

Cited by 22 publications

(15 citation statements)

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“…Curve 1 corresponds to the systematic error of the LDG, defined by the expression (4), with the ring laser rotating counter-clockwise. Curve 2 illustrates the systematic error of the LDG, measured when the ring laser rotated clockwise, but reduced to a counter-clockwise rotation according to the expression (8). Curve 3 defines the systematic error of the optical encoder calculated by the Formula (13).…”

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

confidence: 99%

“…The reference standards for the reproduction of a flat angle unit in a dynamical environment were developed [12]. Utilizing the method of least deviation angle measurement [8], a reference setup was created for the measurement of the refractive index of solids. An important direction in the development of dynamic goniometry was the creation of test benches for monitoring the parameters of digital angle converters [12,22].…”

Section: Discussionmentioning

confidence: 99%

“…Equation ( 11) illustrates that the systematic error of the ring laser does not depend on the direction of rotation, while on the contrary, the systematic error of the encoder depends on it (see (8)). These measurement properties form the basis of the reverse method.…”

Section: Reversal Methodsmentioning

confidence: 99%

“…It allows the calibration of angular encoders with high precision at small angular intervals. The laser dynamic goniometer (LDG), which operates in an automated mode, is a logical extension of traditional goniometers designed to measure the angles between different faces of an optical polygon, the angular deflection of beams passing through transparent prisms and wedges, the determination of the refractive index and the dispersion of optical materials [6,8]. The LDG's method of the angle measurement is based on the physical principle of the operation of an active Sagnac interferometer, which supports two counter-propagating electromagnetic waves in a ring cavity, whose frequency offset results from the instantaneous rate of rotation.…”

Section: Introductionmentioning

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: 99%

Section: Discussionmentioning

confidence: 99%

Section: Reversal Methodsmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Точные измерения углов, необходимые для определения показателя преломления, производят на специальных приборах -гониометрах. Гониометр имеет неподвижный коллиматор, поворотный предметный стол и служит для измерения углов отклонения лучей, преломленных или отраженных исследуемой призмой [2].…”

Section: Introductionunclassified

Измерение Показателя Преломления С Помощью Гониометрической Системы

Юрин¹,

Вишняков²,

Минаев³

2022

Оптика И Спектроскопия

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The article proposes a method for measuring the refractive index using a goniometric system that does not require measuring the prism angle, which simplifies the measurement process compared to the widely used methods of minimum deviation and autocollimation. This method can be used to measure the refractive index of samples in the form of triangular prisms in the visible, ultraviolet and infrared ranges. To implement the method, a goniometric system was used. To obtain the reflection of the refracted beam, a fixed mirror was used, and the refractive index of the prism material was calculated from the solution of a system of equations. The results of an experimental study of a triangular prism made of optical glass N-BK7 using the proposed method and their comparison with the data obtained on the State Primary Standard of the Refractive Index Unit GET 138-2021 are presented.

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