Photometric device and method

Details Photometric device and method Photometric device and method

1995-08-14

1997-06-17

Font, Frank

Optics: measuring and testing

Photometers

Photoelectric

250205, G01J 142

Patent

active

056402350

ABSTRACT:
A photometric device includes a photoelectric conversion section to photoelectrically convert the light from an object, output circuits that output information from the photoelectric conversion section, a logarithmic conversion section that logarithmically compresses the output from the output circuit, and a correction section that corrects the output from the output circuit. The correction section corrects the output from the output circuit after it is logarithmically compressed by the logarithmic conversion section. It is possible to obtain accurate photometric results using the photometric device. A simple computation method is used without burdening the microcomputer and memory.

REFERENCES:
patent: 4182573 (1980-01-01), Yamada et al.
patent: 4247186 (1981-01-01), Uchidoi et al.
patent: 4332469 (1982-06-01), Wendland
patent: 4465354 (1984-08-01), Yuasa
patent: 4737029 (1988-04-01), Yabusaki et al.
patent: 5136325 (1992-08-01), Uchiyama et al.
patent: 5327210 (1994-07-01), Okui et al.

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