Combined sensor

Details Combined sensor Combined sensor

2006-01-31

2006-01-31

Pope, Daryl C (Department: 2632)

Communications: electrical

Condition responsive indicating system

With particular system function

C340S545300

Reexamination Certificate

active

06992577

ABSTRACT:
The combined sensor of the present invention is comprised of an MW sensor and a PIR sensor, in which the frequency difference of two microwaves transmitted by the MW sensor is set such that the phase difference between the IF signals received by the MW sensor is approximately 180° when there is an object at the intermediate distance between the maximum detection distance within the target detection area and the maximum detection distance in the event of a deviation of the detection area attributable to mounting error of the infrared sensor4.

REFERENCES:
patent: 5340980 (1994-08-01), Bianchini et al.
patent: 5714928 (1998-02-01), Sudo et al.
patent: 6842113 (2005-01-01), Tsuji
patent: 6894608 (2005-05-01), Gunderson

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