System and method for detecting the presence of an object

Details System and method for detecting the presence of an object System and method for detecting the presence of an object

2009-07-10

2011-11-22

Pham, Toan N (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S686100

Reexamination Certificate

active

08063790

ABSTRACT:
In a reflection type proximity detector or method, a controller calculates a calibration value based on ambient conditions with the transmitter off and then performs tests. In each test, the calibration value is added to and subtracted from a measured value taken with the transmitter in one state (on or off) and a second measured value is then taken and compared with this range. In tests where the transmitter is switched from off to on between the measurements and the second value exceeds the range, and tests where the transmitter is switched from on to off between the measurements and the second value is below the range, an object is detected. When the transmitter does not switch states between the measurements, and the second value is less than or greater than the range, then no object is detected, as the change in measured value likely resulted from an outside signal.

REFERENCES:
patent: 2008/0204700 (2008-08-01), Reime
patent: 2010/0185411 (2010-07-01), Pfeiffer et al.
patent: 2010/0289662 (2010-11-01), Dasilva et al.

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