Photometer

Details Photometer Photometer

1986-02-13

1987-11-24

Rosenberger, R. A.

Optics: measuring and testing

Photometers

Photoelectric

356230, G01J 142

Patent

active

047084774

ABSTRACT:
A photometrical apparatus has a first light receiving element, and a second light receiving element less sensitive to temperature and other environmental influences than said first light receiving element whereby a value Pm of measured quantity of light from the subject is calculated from the following formula ##EQU1## Pr designates a quantity of light from a standard light source, Dr and Dm designate outputs of the first light receiving element generated by the light from the standard light source and the subject, Dpo and Dpt designate outputs of the first light receiving element generated by the light from the reference light source and the subject, and Dso and Dst designate outputs of the second light receiving element generated by the light from the reference light source and the subject.

REFERENCES:
patent: 323431 (1867-06-01), Card
patent: 2400096 (1946-05-01), Bradley
patent: 3502890 (1970-03-01), Hedelman
patent: 3519361 (1970-07-01), Hidaka et al.
patent: 3973266 (1976-08-01), Kakunodate et al.

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