Method and apparatus for detecting low light levels

Details Method and apparatus for detecting low light levels Method and apparatus for detecting low light levels

1999-03-26

2000-01-04

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214DC, 327514, H01J 4014

Patent

active

060112522

ABSTRACT:
A method and apparatus for measuring very low light signals including integrating a signal from a photo diode, avalanche photo diode, photomultiplier tube or the like, digitally sampling the integrator output more than two times during each integration period, fitting a curve to the multiple digitized readings to calculate the integration slope for each integration period and determining the original signal from the calculated integration slope.

REFERENCES:
patent: 5036187 (1991-07-01), Yoshida et al.
patent: 5233180 (1993-08-01), Tsuruta et al.
patent: 5307145 (1994-04-01), Schenkel et al.

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