Photometry device with correction for temperature change

Details Photometry device with correction for temperature change Photometry device with correction for temperature change

1995-05-11

1997-02-18

Pham, Hoa Q.

Optics: measuring and testing

Photometers

Photoelectric

G01J 142

Patent

active

056045840

ABSTRACT:
A photometry device provides accurate photometry outputs over temperature by correcting light sensitivity variations of a light receiving element due to temperature variations. The photometry device includes the light receiving element, a light sensitivity detection device and a light sensitivity correction device. A correction formula is determined from the outputs of the light sensitivity corrections device generated at a standard condition and a condition other than the standard condition. The light sensitivity correction device corrects the outputs of the light receiving elements based on the correction formula.

REFERENCES:
patent: 4038555 (1977-07-01), Freeman
patent: 4790669 (1988-12-01), Christensen
patent: 5105093 (1992-04-01), Niwa
patent: 5327210 (1994-07-01), Okui et al.

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