State primary standard of refractive index GET 138-2021

Vishnyakov, G. N.; Minaev, V. L.; Bochkareva, Svetlana S.

doi:10.32446/0368-1025it.2022-5-4-9

Cited by 3 publications

(2 citation statements)

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“…In addition, the proposed method can be used to measure the refractive index in the UV and IR ranges. In this case, a photodetector should be installed instead of a fixed mirror, which eliminates the need to use an autocollimator with a beam-splitting cube [9], which limits the spectral range of radiation.…”

Section: Prism Methodsmentioning

confidence: 99%

Measurement of the refractive index using a goniometric system

Yurin

Vishnyakov

Minaev

2022

Optics and Spectroscopy

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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. Keywords: goniometer, refractive index, prism method.

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Section: Prism Methodsmentioning

confidence: 99%

Measurement of the refractive index using a goniometric system

Yurin

Vishnyakov

Minaev

2022

Optics and Spectroscopy

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“…Данное явление приводит к увеличению среднего квадратического отклонения (СКО) результатов. Поэтому для снижения случайной составляющей погрешности желательно использовать лазерные источники излучения с дискретной длиной волны [25], что позволит уменьшить СКО до уровня 1×10 -7 .…”

Section: сравнение результатовunclassified

Modified prism methods for measuring the refractive index of solid and liquid substances

Yurin¹,

Vishnyakov²,

Minaev³

2023

Computer Optics

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Methods for measuring the refractive index of optically transparent dielectric materials are considered. Modified methods based on the methods of minimum deviation and constant deviation are proposed and allow determining the refractive index of triangular prisms with unknown apex angles. In the proposed methods, the angles of light deviation on three faces of the prism are measured, and the refractive index of the material and the prism angles are determined from the solution of a system of equations. To implement the proposed methods, a goniometric system is used. That system was designed to measure angles between the flat surfaces of objects in manual and automated modes. Reference prism samples made of N-SF 1 optical glass, and a hollow prism filled with distilled water are studied. The proposed methods are compared and the measurement error is estimated. It is shown that the modified methods can be used for high-precision measurements of the refractive index in cases where the angles of the prism are unknown, or their measurement is associated with technical difficulties.

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