Patent ID: 6476859
Filing Date: 2002-11-05
Classification: G01J,G01S,G08B

Abstract:
A passive infrared sensor system comprising:a passive infrared detector comprising a two dimensional array of passive infrared sensing elements and means for focusing infrared radiation from a scene onto the array, such that any event within the scene which results in a change in apparent temperature produces a signal in the element or elements corresponding to the region of the scene in which the event occurs; electronic readout, control, and signal processing circuits connected to the array arranged to identify any elements that produce signals corresponding to an event within the scene and to generate output signals which indicate the occurrence of an event and its location within the scene; and a video camera opening in the visible or near infrared spectral region combined with a directive mechanism operable in response to signals from said readout, control and signal processing circuits to steer the camera in azimuth and elevation towards the location of the event.