Standard No.:	GB/T 7962.12-2010
Chinese Name:	无色光学玻璃测试方法　第12部分：光谱内透射比
English Name:	Test methods of colourless optical glass—Part 12:Spectral internal transmittance
Professional Classification:	N05 Material and component for instrument and meter
ICS Classification:	81.040.01 Glass in general
Issued by:
Issued on:	2011-01-14
Implemented on:	2011-05-01
Status:	VALID
Replace:	GB/T7962.12-1987 Colourless optical glass test methods; Spectral internal transmittance
Language:	English
File Format:	PDF
Word Count:	4000 words
Price(USD):	120 (USD)
Delivery:	via email in 1-3 business day

1 Scope

This part of GB/T 7962 specifies the test method principle, apparatus, test steps and data processing for the spectral internal transmittance of colourless optical glass.

This part is applicable to the test on the spectral internal transmittance 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 corrections to), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to 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 term and definition apply.

3.1
internal transmittance
tλ
ratio of luminous flux passing through internal ending point and starting point of the glass, excluding the internal transmittance loss by surface reflection