Photometer

Details Photometer Photometer

1977-04-29

1979-09-04

Hille, Rolf G.

Optics: measuring and testing

Photometers

Photoelectric

356226, 354 60A, G01J 142, G03B 700

Patent

active

041666968

ABSTRACT:
A photometer for providing a measurement of shutter speed or aperture setting corresponding to a preselected value of the other comprises a photodiode supplying a voltage proportional to the logarithm of the measured light intensity. This voltage controls the frequency of an oscillator supplying pulses to a counting circuit during a time interval set by a timer.

REFERENCES:
patent: 3843265 (1974-10-01), Egli et al.
patent: 3882510 (1975-05-01), Nobusawa
patent: 3992098 (1976-11-01), Wirtz

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