Power meter with background subtraction

Details Power meter with background subtraction Power meter with background subtraction

1994-04-24

1994-12-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214C, 250214B, 356222, H01J 4014

Patent

active

053767837

ABSTRACT:
A technique for performing background suppression in photodiode detectors is disclosed. A first detector measures the light emitted by the source to be measured and the background light, while a second detector simultaneously measures the background light only. The value measured by the second detector is subtracted from the value measured by the first detector, and the difference represents the portion of the first detector's measured value which is attributable to the source to be measured.

REFERENCES:
patent: 3601614 (1971-08-01), Platzer, Jr.
patent: 4309604 (1982-01-01), Yoshikawa et al.
patent: 4712000 (1987-12-01), Yoshikawa et al.
patent: 4870264 (1989-09-01), Beha
patent: 4982081 (1991-01-01), Schmidt
patent: 5029276 (1991-07-01), Buehler et al.
patent: 5114228 (1992-05-01), Greenfield et al.
patent: 5117099 (1992-05-01), Schmidt
patent: 5266792 (1993-11-01), Crowne et al.

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