Browse Prior Art Database

Digital Optical Discrimination

IP.com Disclosure Number: IPCOM000089456D
Original Publication Date: 1977-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Dunik, SL: AUTHOR

Abstract

Photocells 1A to 1N convert incident light into a voltage or current which varies proportionally with the intensity of the light impinging on the photocell. Photocells 1A to 1N are coupled, one at a time, by multiplexor 2 to analog-to-digital converter 3. Controller 4 controls the sequencing of multiplexor 2 and storage 5. The digital value corresponding to the light impinging on a selected photocell is provided to comparator 6. Storage 5, under control of controller 4, furnishes comparator 6 with the digital value of the last peak value sensed by the selected photocell. Comparator 6 then compares the digital value obtained during the latest sensing operation with the value stored in the corresponding position in storage 5.

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Digital Optical Discrimination

Photocells 1A to 1N convert incident light into a voltage or current which varies proportionally with the intensity of the light impinging on the photocell. Photocells 1A to 1N are coupled, one at a time, by multiplexor 2 to analog-to- digital converter 3. Controller 4 controls the sequencing of multiplexor 2 and storage 5. The digital value corresponding to the light impinging on a selected photocell is provided to comparator 6. Storage 5, under control of controller 4, furnishes comparator 6 with the digital value of the last peak value sensed by the selected photocell. Comparator 6 then compares the digital value obtained during the latest sensing operation with the value stored in the corresponding position in storage 5. If the difference exceeds a specified threshold value, threshold device 7 becomes active to update storage 5 and indicate a change to the using system.

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