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This part of GB/T 7962 specifies the test principle, test apparatus, test steps and data processing for the temperature coefficient of refractive index of colourless optical glass.
This part is applicable to the test on temperature coefficient of refractive index 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
3 Terms and definitions
For the purposes of this part, the following terms and definitions apply.
minimum deviation angle
minimum included angle between the incident light ray and the emergent light ray if the incidence angle is equal to the emergence angle where the light ray deviates when passing through the refracting prism, expressed by δ
temperature coefficient of refractive index
change rate of the refractive index of material with respect to temperature while other conditions are kept unchanged, which is classified into absolute temperature coefficient of refractive index and relative temperature coefficient of refractive index, expressed by βabs and βrel respectively
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