Optics: measuring and testing – Crystal or gem examination
Patent
1980-01-21
1981-09-29
Evans, F. L.
Optics: measuring and testing
Crystal or gem examination
356319, G01N 2127
Patent
active
042919754
ABSTRACT:
Method and apparatus for measuring the spectral transmission characteristics of gems, particularly diamonds. Polychromatic light from a light source is transmitted through a diamond to be analyzed, after which the transmitted light beam is separated into a plurality of separate wavelength bands and the intensity of light in the successive bands is measured by a first linear array of photodiodes. Simultaneously, a reference beam of light from the light source is separated into a plurality of corresponding wavelength bands, and the intensity of light in the successive bands are measured by a second linear array of photodiodes. The two measurements produced by each pair of corresponding photodiodes are then compared with each other, to provide a plurality of measurements indicative of the transmission characteristics of the diamond for the plurality of wavelength bands. The transmission measurements for prescribed groupings of wavelength bands are then averaged and compared with each other in a prescribed fashion, to accurately grade the diamond according to conventional grading standards.
REFERENCES:
patent: 2960909 (1960-11-01), Shipley, Jr.
patent: 3794424 (1974-02-01), Eickhorst et al.
patent: 3867032 (1975-02-01), Bruck
patent: 3989379 (1976-11-01), Eickhorst
patent: 4029419 (1977-06-01), Schumann et al.
patent: 4125329 (1978-11-01), French et al.
Evans F. L.
Scientific Gem Identification, Inc.
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