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BS ISO 21395-1:2020

BS ISO 21395-1:2020

$142.49

Optics and photonics. Test method for refractive index of optical glasses – Minimum deviation method

Published By Publication Date Number of Pages
BSI 2020 30
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This document specifies the measuring method for the refractive index of optical glasses with the accuracy within 1 × 10?5 used in the spectral range from 365 nm to 2 400 nm.

Additional information on how to apply the refractive index in the dispersion and the various dispersion formulae of optical glasses is given in Annex A and Annex B.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
4 Principle
10 5 Measuring apparatus
5.1 General construction
11 5.2 Goniometer
5.3 Light source
12 5.4 Detector
6 Specimen prism
6.1 General
6.2 Dimensions
13 6.3 Apex angle
6.4 Flatness
7 Environmental condition of measurement
7.1 Temperature
7.2 Humidity
7.3 Atmospheric pressure
8 Measurement
8.1 Adjustment of the measurement specimen prism
14 8.2 Measurement of the apex angle, α
15 8.3 Measurement of the angle of minimum deviation, δmin
16 9 Indication
10 Test report
17 Annex A (informative) Calculation of principal dispersion, Abbe number, partial dispersion and relative partial dispersion
20 Annex B (informative) Dispersion formulae for calculation of refractive index at arbitrary wavelength
22 Annex C (informative) Correction of refractive index for temperature, humidity and atmospheric pressure
24 Annex D (informative) Other measurement methods of the apex angle
26 Annex E (informative) Other measurement methods of the angle of minimum deviation
29 Bibliography

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BS ISO 21395-1:2020
$142.49