Flexible tube optical intrusion detector

Details Flexible tube optical intrusion detector Flexible tube optical intrusion detector

1988-01-25

1989-05-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, G01V 904

Patent

active

048291749

ABSTRACT:
A hollow flexible vinyl or other plastic tube having a shiny inner wall is disposed along a boundary where intrusion detection is desired. A beam of infrared radiation from an LED at one end of the tube is passed through the tube by reflections from the wall to a detector at the other end. The radiation is conducted along curved paths as well as straight paths. An object intruding into the protected space with sufficient force to deform the tube wall attenuates the radiation. A detection circuit senses the attenuation and produces an intrusion signal. The detection circuit includes logic which detects a failure in the radiation source or a light leak in the tube.

REFERENCES:
patent: 3913872 (1975-10-01), Weber
patent: 4067709 (1978-01-01), Stanton
patent: 4414537 (1983-11-01), Grimes
patent: 4465998 (1984-08-01), Durand
patent: 4542291 (1985-09-01), Zimmerman
patent: 4683975 (1987-08-01), Booth et al.

Affiliated with

Also associated with

Rating

Flexible tube optical intrusion detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Flexible tube optical intrusion detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flexible tube optical intrusion detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-91118