Overview
ISO 10345-2:1992 is an international standard developed by the International Organization for Standardization (ISO). This document outlines the method for determining the stress-optical coefficient of isotropic glass using a bending test. The stress-optical coefficient is a material characteristic that is essential for interpreting measurements of stress-induced birefringence in glass products. The standard is particularly relevant in laboratory settings, quality assurance, and the production of optical glass materials.
Key Topics
- Stress-Optical Coefficient: The standard defines the stress-optical coefficient as the ratio of birefringence effect to the applied uniaxial stress on an optical material. This value is wavelength-dependent and can be positive or negative.
- Bending Test Method: ISO 10345-2 focuses on the bending test procedure to determine the stress-optical coefficient of isotropic glass specimens. The method involves uniaxial loading of the test specimen to induce stress and measure resulting optical path differences.
- Measurement Apparatus: The standard specifies the use of polarization measuring equipment, compensators, and stressing equipment for accurate measurement of optical path differences under bending stress.
- Test Specimen Preparation: It details the required dimensions, surface quality, and conditioning of test specimens to ensure reliable and repeatable results.
- Calculation and Reporting: Procedures are provided for calculating the stress and the stress-optical coefficient, along with requirements for comprehensive test reporting.
Applications
ISO 10345-2:1992 is applied in several practical contexts, including:
- Material Characterization: Manufacturers and researchers utilize this standard to characterize the stress-optical properties of glass, which is critical in optical component production and development.
- Quality Control: Routine use in laboratory glassware and optical glass industries for quality assurance and to verify that glass products meet specified optical performance criteria.
- Birefringence Analysis: The standard is essential for accurately determining internal stresses via birefringence measurements, a key consideration in safety and durability analysis of glass components.
- Design and Process Optimization: Knowledge of the stress-optical coefficient helps engineers design glass products with minimal residual stresses, improving product performance and lifespan.
Related Standards
For comprehensive glass testing and stress measurement, the following standards are closely related:
- ISO 10345-1: Glass - Determination of stress-optical coefficient - Part 1: Tensile test. Provides an alternative method using tensile loading.
- ISO 9802: Raw optical glass - Vocabulary. Defines key terminology relevant to optical glass testing.
- General ASTM and ISO Glass Testing Standards: These address additional glass properties, tests, and terminology important for industry professionals.
Practical Value
Implementing ISO 10345-2:1992 strengthens material verification processes by ensuring that the mechanical and optical properties of glass are reliably quantified. Compliance with this standard:
- Facilitates consistent and accurate assessment of glass stress characteristics
- Enhances product safety and quality by ensuring accurate birefringence measurements
- Promotes international compatibility and standardization in optical glass testing
By following ISO 10345-2, organizations gain confidence in glass material performance, supporting innovation and competitiveness in the global glass and optical industries.
