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Description of ASTM-C1648 2012ASTM C1648-12Historical Standard: Standard Guide for Choosing a Method for Determining the Index of Refraction and Dispersion of GlassASTM C1648Scope 1.1 This guide identifies and describes seven test methods for measuring the index of refraction of glass, with comments relevant to their uses such that an appropriate choice of method can be made. Four additional methods are mentioned by name, and brief descriptive information is given in Annex A1. The choice of a test method will depend upon the accuracy required, the nature of the test specimen that can be provided, the instrumentation available, and (perhaps) the time required for, or the cost of, the analysis. Refractive index is a function of the wavelength of light; therefore, its measurement is made with narrow-bandwidth light. Dispersion is the physical phenomenon of the variation of refractive index with wavelength. The nature of the test-specimen refers to its size, form, and quality of finish, as described in each of the methods herein. The test methods described are mostly for the visible range of wavelengths (approximately 400 to 780μm); however, some methods can be extended to the ultraviolet and near infrared, using radiation detectors other than the human eye. 1.1.1 List of test methods included in this guide: 1.1.1.1 Becke line (method of central illumination), 1.1.1.2 Apparent depth of microscope focus (the method of the Duc de Chaulnes), 1.1.1.3 Critical Angle Refractometers (Abbe type and Pulfrich type), 1.1.1.4 Metricon2 system, 1.1.1.5 Vee-block refractometers, 1.1.1.6 Prism spectrometer, and 1.1.1.7 Specular reflectance. 1.1.2 Test methods presented by name only (see Annex A1): 1.1.2.1 Immersion refractometers, 1.1.2.2 Interferometry, 1.1.2.3 Ellipsometry, and 1.1.2.4 Method of oblique illumination. 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.3 Warning—Refractive index liquids are used in several of the following test methods. Cleaning with organic liquid solvents also is specified. Degrees of hazard associated with the use of these materials vary with the chemical nature, volatility, and quantity used. See manufacturer's literature and general information on hazardous chemicals. Keywords Abbe-number; dispersion; glass; index of refraction; refractive index; refractometer ICS Code ICS Number Code 81.040.30 (Glass products) DOI: 10.1520/C1648-12 The following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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