Standard No.:	GB/T 7962.12-2010
English Name:	Test methods of colourless optical glass—Part 12:Spectral internal transmittance
Chinese Name:	无色光学玻璃测试方法　第12部分：光谱内透射比
Chinese Classification:	N05    Material and component for instrument and meter
Professional Classification:	GB    National Standard
ICS Classification:	81.040.01 81.040.01    Glass in general 81.040.01
Source Content Issued by:	AQSIQ
Issued on:	2011-1-14
Implemented on:	2011-5-1
Status:	valid
Superseding:	GB/T 7962.12-1987 Colourless optical glass test methods; Spectral internal transmittance
Target Language:	English
File Format:	PDF
Word Count:	4000 words
Translation Price(USD):	110.0
Delivery:	via email in 1 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

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