Method to improve white light immunity of infrared motion...

Details Method to improve white light immunity of infrared motion... Method to improve white light immunity of infrared motion...

2008-12-10

2011-10-11

Trieu, Van T. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S556000, C340S522000

Reexamination Certificate

active

08035514

ABSTRACT:
A system and method for improved white light immunity for IR motion sensors. The system comprises a first sensor responsive to light in a first range of wavelengths in the secure area, the first sensor generating a first output signal indicative of a first detected parameter of the light in the first range of wavelengths, a second sensor proximate to the first sensor, the second sensor being responsive to light in a second range of wavelengths in the secure area, and a logic unit for compensating the first output signal based in part upon a reference signal indicative of a second parameter of the light in the second range of wavelengths. The first sensor is a pyro-electric sensor and the second sensor is a visible light sensor. The second parameter comprises an intensity value of the light in the second range of wavelengths, wherein the reference signal is indicative of a differentiation of said intensity value with respect to time. The system further comprises an alarm generation unit to generate an alarm if the first signal exceeds a first threshold value, the first threshold value being a function of a baseline of the first signal.

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patent: 7679509 (2010-03-01), Royer

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