Photometric apparatus

Details Photometric apparatus Photometric apparatus

1975-12-11

1978-11-14

Evans, F. L.

Optics: measuring and testing

By shade or color

With color transmitting filter

250226, 356404, 356223, G01J 350

Patent

active

041253302

ABSTRACT:
Photometric apparatus for use as a color analyser or color temperature meter or graphic arts photometer has a logarithmic photometer, means for storing the analogue output of the photometer combined with a reference signal, and means for comparing the stored signal with a subsequent photometer output signal connected by a different reference signal. In a color analyser or color temperature meter switchable color filters are provided with automatic switching of the reference signals in accordance with the color section.

REFERENCES:
patent: 3612683 (1971-10-01), Riley et al.
patent: 3765778 (1973-10-01), Bey et al.
patent: 3856413 (1974-12-01), Bey et al.
patent: 3972617 (1976-08-01), Shibata et al.

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