Light measurement device

Optics: measuring and testing – Photometers – Photoelectric

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Details

356 43, 250238, G01J 142

Patent

active

053272102

ABSTRACT:
A light measurement device includes a photoelectric converter for receiving light from an object to be measured and converting the light to a measuring electrical energy in accordance with the intensity of the light, an offset amount measurement device for measuring the offset amount of the photoelectric converter, temperature measurement device for measuring a first temperature of the photoelectric converter when measuring the offset amount, and a second temperature of the photoelectric converter when measuring the light from the object, a memory device for storing a characteristic of the photoelectric converter with respect to temperature, correction amount calculation device for calculating a correction amount based on the characteristic, the first temperature, and the second temperature, and a light intensity calculation device for calculating a light intensity based on the measuring electrical energy, the offset amount, and the correction amount.

REFERENCES:
patent: 4038555 (1977-07-01), Freeman
patent: 4479780 (1984-10-01), Tokuda
patent: 4790669 (1988-12-01), Christensen
patent: 4864356 (1989-09-01), Asano et al.
patent: 4924081 (1990-05-01), Arima et al.
patent: 5105093 (1992-04-01), Niwa
"Sensor Technology 5" Japanese magazine issued Apr. 20, 1985.
"TV-Analyzer II", Manual of Minolta Camera issued 1985.

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