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.

Abstract: The present invention provides a system and method for improved white light immunity for 1R 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 pyroelectric 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.