Optical multimeter

Details Optical multimeter Optical multimeter

1980-03-14

1982-06-01

Corbin, John K.

Optics: measuring and testing

Photometers

Photoelectric

356 731, 356223, G01J 142, G01N 2101

Patent

active

043324690

ABSTRACT:
An improved light intensity measuring device includes a temperature compensating logarithmic amplifier that changes photodetector currents which have been converted from AC to DC to a voltage which drives an analog to digital converter. The resulting digital signals are displayed. For differential or absolute measurements, a second, identical, logarithmic amplifier channel is employed and both are coupled to a differential amplifier. A standard reference current applied to one channel provides an "absolute" measurement of the signal applied to the other channel or a second signal may be compared to the first.

REFERENCES:
patent: 3651252 (1972-03-01), Land et al.
patent: 4309105 (1982-01-01), Lebouska

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