Patent ID: 7834309
Filing Date: 2010-11-16
Classification: G08B

Abstract:
1. A security sensor apparatus for sensing movement of an object, said sensor apparatus comprising: an electronics arrangement including an optical emitter and an optical receiver, said optical receiver having an axis of reception, said optical emitter being configured to emit a first beam along an axis of emission in an emission direction, the axis of emission diverging in the emission direction from the axis of reception at an angle of at least two degrees, said emitter having an emission cone and said receiver having a reception cone, the emission cone and the reception cone being nonintersecting, said electronics arrangement being configured to be mounted in association with one of a first surface of the object and a second surface of a structure disposed in opposition to the first surface; and a reflector arrangement including at least one reflective surface, said reflector arrangement being configured to be mounted in association with an other of the first surface and the second surface, said at least one reflective surface being configured to receive an unreflected portion of the first beam and produce a second beam from the unreflected portion of the first beam, the second beam being directed at and received by said optical receiver.