Optics: measuring and testing – Photometers – Photoelectric
Patent
1978-03-21
1980-05-06
Hille, Rolf G.
Optics: measuring and testing
Photometers
Photoelectric
324132, G01J 146
Patent
active
042014727
ABSTRACT:
A light signal entering a photo-electric converter means is interrupted at a certain interval of time. An electrical signal produced from the photo-electric converter means, after a predetermined amount of electrical signal is added to it, is A-D converted. The difference between the digital signal associated with the interruption of light to the photo-electric converter means and the digital signal associated with non-interruption of light to the photo-electric converter means is produced, which difference is proportional to the incident light signal. Even when the light entering the photo-electric converter means is very weak, the fact that a predetermined amount of electrical signal is added contributes to A-D conversion of good linearity. Even very weak light is thus A-D converted accurately. Noises and undesirable DC signal components contained in the two types of digital signals are offset by production of the difference.
REFERENCES:
patent: 3880524 (1975-04-01), Dill
patent: 3892493 (1975-07-01), Pallingen et al.
patent: 4002977 (1977-01-01), Sun
patent: 4087186 (1978-05-01), Vinatzer
Hille Rolf G.
Hitachi , Ltd.
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