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Refractive Index Measurement Using a Modified Prism Method

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

In this article, goniometric methods for measuring the refractive index of optically transparent materials are discussed, and a modified method for measuring the refractive index of triangular prisms is proposed. A modified constant deviation method for measuring the refractive index was proposed in the previous study [1] that did not require refractive angle measurement of the prism and simplified the measurement process; however, its implementation required low-intensity radiation reflected from the input face of the prism, which created difficulties in processing signals from a photoelectric receiver and can increase measurement error. In this study, this problem was eliminated with the usage of two fixed mirrors to obtain the reflection of the refracted beam and determine the initial position of the prism, and the refractive index of the prism material was calculated from the solution of a system of equations. This approach avoids the use of radiation reflected from the prism faces, which helped in increasing the accuracy by automating the measurement process. Herein, the results of an experimental study of a triangular prism made of optical glass using the proposed modified prism method are compared with the values obtained using the least deviation method, which has the highest accuracy in determining the refractive index. The proposed method can be used to study triangular prisms made of optically transparent materials as well as optically transparent liquids poured in a hollow triangular prism.

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Notes

  1. GOST 28869-90. Optical Materials. Methods for Measuring the Refractive Index.

  2. Inertech [website]. URL: http://inertech-ltd.com (date of access: 10/28/2022).

  3. GOST 8.050-73. State System for Ensuring Uniform Measurement. Normal Conditions for Performing Linear and Angular Measurements.

  4. GOST 13659-78. Optical Colorless Glass. Physical and Chemical Characteristics. Main Parameters.

  5. Hamamatsu Photonics [website]. URL: https://www.hamamatsu.com (accessed: 10/28/2022).

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Authors and Affiliations

  1. National Research University Higher School of Economics, 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. 2, pp. 19–23, February, 2023.

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Yurin, A.I., Vishnyakov, G.N. & Minaev, V.L. Refractive Index Measurement Using a Modified Prism Method. Meas Tech 66, 96–100 (2023). https://doi.org/10.1007/s11018-023-02195-9

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  • DOI: https://doi.org/10.1007/s11018-023-02195-9

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