Technique for correcting non-linearity in a photodetector

Details Technique for correcting non-linearity in a photodetector Technique for correcting non-linearity in a photodetector

G - Physics

01

J

G01J 3/00 (2006.01) G01J 3/45 (2006.01) G01N 21/27 (2006.01) G01J 1/08 (2006.01) G01J 3/453 (2006.01)

Patent

CA 2122449

2122449 9310553 PCTABS00022 A technique that corrects photodetector non-linearity without increasing the noise level in the detector signal. The detector (10) is coupled to a preamplifier (100) characterized by the absence of positive feedback, and the preamplifier signal is communicated to a linear amplifier whose output signal is then digitized. The digitized signal is then transformed according to stored calibration information that is representative of the non-linear characteristic of the photodetector. The transformed digitized value thus exhibits a linear characteristic as a function of the intensity of the light source (180). A number of embodiments perform the correction in hardware before digitizing the signal.

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