Detection systems

Details Detection systems Detection systems

B - Operations, Transporting

66

B

B66B 13/26 (2006.01) G01V 8/12 (2006.01) G01V 9/04 (1990.01)

Patent

CA 2107333

2107333 9218413 PCTABS00016 A detection system includes an infrared emitter (2) and an infrared detector (8) having optical axes (6) and (12) extending parallel to one another but being offset from one another. As the detector (8) and the emitter (2) approach one another the distance between them decreases but their angular separation increases. Accordingly, the increase in signal engendered in the detector as it approaches the emitter is countered to some extent by the greater angular separation. Accordingly, the net result is that any change in output of the detector resulting from a change in its spacing from the emitter is substantially reduced.

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