Title:
MULTIFUNCTION OPTICAL SENSOR WITH VARIABLE DETECTION THRESHOLD AND NOISE SUPPRESSION
Document Type and Number:
WIPO Patent Application WO2001077708
Kind Code:
A3
Abstract:
A sensor for optically detecting a location of an object within a field of the sensor includes first, second and third photodetectors arranged to receive photons from respective first, second and third sensing zones within the filed of the sensor. The first, second and third sensing zones are adjacent to one another and the sensor includes a processing circuit that receives first, second and third signals from the respective first, second and third photodetectors. One of the first, second and third signals is indicative of photons reflected by the object within the field of the sensor and the processing circuit compares the one of the first, second and third signals to another one of the first, second and third signals and a predetermined threshold value to determine the location of the object within the field of the sensor.
Inventors:
CHEN BO SU
Application Number:
PCT/US2001/011601
Publication Date:
July 18, 2002
Filing Date:
April 09, 2001
Export Citation:
Assignee:
HONEYWELL INT INC (US)
International Classes:
G01V8/20; G01S7/486; G01S17/46; H03K17/78; G01S17/18; (IPC1-7): G01S17/46; G01S7/491
Foreign References:
| US5751406A | 1998-05-12 | |||
| DE19721105A1 | 1998-11-26 | |||
| US4575237A | 1986-03-11 | |||
| EP0685748A1 | 1995-12-06 | |||
| US4899041A | 1990-02-06 | |||
| DE4032361A1 | 1992-04-16 |
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