H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/29, 354/70
H03M 1/34 (2006.01) G01J 1/42 (2006.01) H03M 1/00 (2006.01)
Patent
CA 1208369
ABSTRACT OF THE DISCLOSURE A method and apparatus for converting radiant energy levels to digital data wherein an image sensor is provided having at least one row of sensor elements each including a light sensitive capacitor and an access switch and which changes state and produces a corresponding binary output signal when a predetermined charge threshold is exceeded by the capacitor whose charge is a function of intensity and period of an illumination. The row of elements is first calibrated by illuminating same with a reference light source and sensing at a first frequency (F) such that approximately one half of the elements change state and counting the digital output signals corresponding to the changes of state to obtain a first number (B). Thereafter, the row is illuminated with an unknown light source which has a lower radiant energy level than that of the reference light source and senses at a frequency F/2. The digital output signals corresponding to the changes of state are counted to obtain a second number (A). The numbers A and B are compared to produce a digital "1" signal when A > B and a digital "0" when A < B corresponding to digital data bit N1. The sensing and comparing are repeated for each successive bit N2, N3...Nk of a K bits of digital data at successive sensing frequencies in accordance with Image
443398
Miles Laboratories Inc.
Osler Hoskin & Harcourt Llp
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