Method of making a piece of glass for measuring transmittance

Details Method of making a piece of glass for measuring transmittance Method of making a piece of glass for measuring transmittance

1995-09-08

1998-07-07

Silverman, Stanley S.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 61, 134 3, 134 7, 451 41, 451 42, C03C 1502, C03C 1900

Patent

active

057762198

ABSTRACT:
In the measurement of internal transmittance of optical pieces, a standard is set for the piece for measuring the transmittance and a method of making the piece is provided. In the piece for measuring the transmittance of optical materials having two opposing polished surfaces, their surface roughness rms is set to 10 .ANG. or less, thereby making it possible to accurately measure the internal transmittance in the short wavelength region of 300 nm or less where the intensity of the light source of spectrophotometer begins to decrease.

REFERENCES:
patent: 3123452 (1964-03-01), Harris et al.
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patent: 3982917 (1976-09-01), Upton
patent: 4106859 (1978-08-01), Doriguzzi et al.
patent: 4198788 (1980-04-01), Fleetwood et al.
patent: 4911743 (1990-03-01), Bagby
Japanese Optical Glass Industrial Standards "Appendix: Explanations on Measuring Method of Optical Glass", Translated and Published by Japan Optical Glass Manufacturer's Association, Mar. 3, 1975.
Gotz, J., Sprechsaal fur keramik glas email silikate, Nr. 13, 101.Jg., 1968, S. 539-540, 542-544. (no month avail.).
Kaller, A., On the polishing of glass, particularly the precision polishing of optical surfaces, In: Glastech. Ber. 64, 1991, Nr. 9, S. 241-252. (no month avail.).
Patent Abstracts of Japan of JP 1-40267, vol. 13, No. 225, May 25, 1989.

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