Importance

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Abstract

A system and method are disclosed for enabling the selective monitoring of various regions of an aperture having a powered closure operative therein. Each of plural, individually selectable emitters is adapted to provide a narrow beam whose angle with respect to a horizontal plane is offset from the other emitters. All of the radiated beams lie in substantially the same plane in azimuth. A controller responds to certain stimuli to selectively activate one or more of the emitters. The energy thus produced is monitored by a receiver preferably disposed within the same housing. The receiver output is analyzed by the controller to identify the presence of an obstacle in that portion of the aperture illuminated by the selected emitter(s). A variety of systems may provide input to the controller for the purpose of influencing which of the plural emitters are to be activated for object detection. In an alternative embodiment, one or more unswitched emitters may be used in conjunction with plural, selectively activated receivers. In a further embodiment, plural emitters and plural receivers are provided, all being independently selectable by the controller. The ability to selectively monitor a discrete portion or portions of an aperture, based upon a variety of factors, is provided.

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First Claim