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Measurement of the Refractive Index Using a Modified Constant Deviation Method

  • OPTICAL-PHYSICAL MEASUREMENTS
  • Published:
Measurement Techniques Aims and scope

Goniometric methods for measurement of the refractive index of optically transparent materials are considered. A modified constant deviation method is proposed for measurement of the refractive index of a trihedral prism. The proposed modified method does not require measurement of the refractive angle of the prism, which simplifies the measurement process compared to the widely used methods of minimum deviation (the Fraunhofer method) and autocollimation (the Littrow–Abbe method). To implement the method, a goniometric system was used, designed to measure angles formed by flat surfaces of objects. In order to obtain a reflection of the refracted ray, a fixed mirror was placed in its path, and the refractive index of the prism material was calculated from the solution of a system of equations. Results are presented for an experimental study of a triangular prism made of optical glass using the proposed method, and they are compared with results obtained using the method of minimum deviation. The proposed method of constant deviation can be used to study trihedral prisms made of optically transparent materials, as well as liquid optically transparent substances placed in a hollow trihedral prism.

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Notes

  1. GOST 28869-89. Optical materials. Methods for measuring the index of refraction.

  2. ISO 21395-1.2020. Optics and photonics. – Test method for refractive index of optical glasses – Part I: Minimum deviation method.

  3. OOO Inertech. URL: http://inertech-ltd.com (date accessed: October 28, 2022).

  4. GOST 13659-78. Colorless optical glass. Chemical and physical characteristics. Basic parameters.

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Authors and Affiliations

  1. HSE University, Moscow, Russia

    A. I. Yurin & V. L. Minaev

  2. All-Russian Research Institute for Optical and Physical Measurements, Moscow, Russia

    A. I. Yurin, G. N. Vishnyakov & V. L. Minaev

  3. Bauman Moscow State Technical University, Moscow, Russia

    G. N. Vishnyakov

Authors
  1. A. I. Yurin
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  2. G. N. Vishnyakov
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  3. V. L. Minaev
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Correspondence to A. I. Yurin.

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Translated from Izmeritel'naya Tekhnika, No. 12, pp. 35–39, December, 2022.

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Yurin, A.I., Vishnyakov, G.N. & Minaev, V.L. Measurement of the Refractive Index Using a Modified Constant Deviation Method. Meas Tech 65, 904–908 (2023). https://doi.org/10.1007/s11018-023-02168-y

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  • DOI: https://doi.org/10.1007/s11018-023-02168-y

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