Door obstacle sensor

Details Door obstacle sensor Door obstacle sensor

2007-08-07

2007-08-07

Stafira, Michael P. (Department: 2886)

Optics: measuring and testing

Photometers

C356S218000

Reexamination Certificate

active

10741143

ABSTRACT:
A door obstacle sensor in which an optical transmitter and a receiver are located on the same side of an entranceway, and a retroreflector is placed on the opposite side. A controller measures the time of flight of a light beam that is reflected from the retroreflective target. All future target distances are compared to the initial distance, and a decision is made as to an object being present in or absent from the entranceway.

REFERENCES:
patent: 3597755 (1971-08-01), Parkin
patent: 3644917 (1972-02-01), Perlman
patent: 4467251 (1984-08-01), Jonsson
patent: 4736097 (1988-04-01), Philipp
patent: 5508511 (1996-04-01), Zur et al.

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