Patent ID: 6411215
Filing Date: 2002-06-25
Classification: E05B,G08B

Abstract:
An optical method of remotely detecting whether a first object is in a specific position, location or orientation, here called the desired position, said method comprising the steps of:a) utilizing optically retroreflective means associated with said first object; b) utilizing a light source which produces a beam of light, said beam of light being at least partially collimated, c) directing said beam of light at the location where said retroreflective means would be when said first object is in said desired position; d) utilizing means to detect the reflected light from said retroreflective means; e) locating said means to detect said reflected light so that said means to detect said reflected light receives at least a portion of the light reflected from said retroreflective means when said first object is in said desired position; the intensity of said light source and the collimation of said beam of light therefrom, the amount of light reflected from said retroreflective means and the divergence of said beam of light therefrom, the amount of said light reflected which is gathered by said means to detect said reflected light and the sensitivity thereof all being such that said means to detect said reflected light can be located at least one meter from said retroreflective means and said reflected light can be reliably detected, said light source and said means to detect said reflected light both being mounted in the same sensor enclosure, whereby, according to the light received at said means to detect said reflected light, the state or condition of an appliance, device, machine or other piece of equipment can be remotely detected, without running wiring to, or making mechanical or electrical modifications to the appliance, device, machine or other piece of equipment.