GB/T 7962.5-2010 in English

1 Scope

This part of GB/T 7962 specifies the test method, test steps and data processing for the stress birefringence of colourless optical glass.

This part is applicable to testing the stress birefringence 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.

3.1
stress birefringence
optical glass is an isotropous substance; it will show optical anisotropy under stress, and a beam of polarized light in vertical incidence will be decomposed into two polarized light beams with mutually perpendicular vibration directions and different propagation velocities along the two principal stress directions in the glass, and such birefringence caused by stress is called stress birefringence

3.2
optical path difference
δ
polarized light will produce birefringence when passing through the glass under stress, optical path difference is generated due to different optical paths of two polarized light beams when passing through the glass caused by different propagation velocities

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Sample
7 Test
8 Data processing