Two-beam colorimeter

Details Two-beam colorimeter Two-beam colorimeter

1976-04-05

1978-08-22

Evans, F. L.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

G01J 348

Patent

active

041085558

ABSTRACT:
A two-beam colorimeter comprising an incandescent lamp, a resistor connected electrically in series with the incandescent lamp, a condenser and an interference filter disposed in side by side relation adjacent said incandescent lamp, a two-hole diaphragm for developing a comparison light beam and a measuring light beam, a reference filter disposed in the path of the comparison light beam, and an adjusting filter movable into and out of the path of the measuring light beam.

REFERENCES:
patent: 2339053 (1944-01-01), Coleman
patent: 3010798 (1961-11-01), Whitehead et al.
patent: 3818263 (1974-06-01), Belko
Shurkus, "Colorimetry", Radio News, Jun. 1944, pp. 25-27, 56, 58, 60 and 71.

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