1 Scope
This part of GB/T 7962 specifies the test apparatus, test steps and data processing for the coefficient of optical absorption of colourless optical glass.
This part is applicable to the measurement for the coefficient of optical absorption of colourless optical glass.
2 Normative references
The following documents contain provisions which, through reference in this part of GB/T 7962, constitute provisions of this part. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editions apply to this part.
GB/T 903 Colourless optical glass
GB/T 7962.1 Test methods of colourless optical glass - Part 1: Refractive index and coefficient of dispersion
3 Terms and definitions
For the purposes of this part, the following terms and definitions apply.
3.1
transmittance
T
ratio of light intensity before and after light passes through the glass
3.2
coefficient of optical absorption
K
negative value of the natural logarithm of the internal transmittance per centimeter of white light passes through the glass
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Sample
7 Measuring steps
8 Data processing
