Circuit arrangement for evaluating the output of a photodiode un

Details Circuit arrangement for evaluating the output of a photodiode un Circuit arrangement for evaluating the output of a photodiode un

1989-01-26

1990-04-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502084, G01J 120

Patent

active

049142836

ABSTRACT:
The intensity of the optical radiation varies within a wide range. The proportion of parasitic radiation registered by the photodiodes (D1 to Dn) increases with increasing radiation intensity. To exclude this parasitic radiation from evaluation, the photodiodes (D1 to Dn) are followed by analog comparators (K1 to Kn) with a variable reference voltage (Uref1). The reference voltage (Uref1) is varied by an analog comparator (Kz1) in porportion to the radiation intensity determined by a central photodiode (Dz).

REFERENCES:
patent: 4018532 (1977-04-01), Fletcher
patent: 4179612 (1979-12-01), Smith
patent: 4355896 (1982-10-01), Laue
patent: 4424801 (1984-01-01), Mori
patent: 4484565 (1984-11-01), Mori
patent: 4495408 (1985-01-01), Mori
patent: 4672191 (1987-06-01), Cofield

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