Automatic closing door proximity detector

A proximity detection system for detecting an object in a detection volume V comprising:

• a first boundary member and a second boundary member, defining therebetween a plane P and a gap G;
• the first boundary member facing and movable relative to the second boundary member and;
• the first boundary member comprising a detector mounted thereto;
• the detector comprising one or more directional emitters for emitting electromagnetic radiation, and one or more directional receivers for detecting the presence of said emitted electromagnetic radiation;
• wherein the one or more directional emitters are positioned facing an acute angle α to the plane P measured in the horizontal plane, to direct electromagnetic radiation at an angle α to the plane P;
• and
• wherein the one or more directional emitters comprise one or more up emitters and one or more down emitters,
• the one or more up emitters further positioned to face upwards at an acute angle βup relative to plane P when measured in the vertical plane, to direct electromagnetic radiation at an angle βup to the plane P, and
• the one or more down emitters further positioned to face downwards at an acute angle βdown relative to plane P when measured in the vertical plane, to direct electromagnetic radiation at an angle βdown to the plane P;
• and
• wherein the one or more directional receivers are positioned facing at an acute angle θ relative to the plane P when measured in the horizontal plane such that they do not directly receive electromagnetic radiation from the one or more directional emitters, and wherein the one or more directional receivers are for receiving the radiation of the one or more directional emitters reflected from the object O in the detection volume V.