Distributed fiber optic sensing system

Details Distributed fiber optic sensing system Distributed fiber optic sensing system

G - Physics

08

B

G08B 13/181 (2006.01) G01D 5/353 (2006.01) G01H 9/00 (2006.01) G08B 13/187 (2006.01)

Patent

CA 2139134

A distributed fiber optic sensing system for detecting mechanical, acoustic or ultrasonic disturbances is disclosed. This sys- tem is optimized for use as an intrusion detection system in security applications. Light is launched into opposite ends of a sen- sing fiber loop (24) such that two beams circulate through the loop in opposite directions and then recombine to produce an inter- ference pattern on a photoelectric detector (30). Disturbances of the sensing fiber loop produce corresponding changes in the interference pattern and thereby the signal level at the detector. The changes in the electrical signal from the detector are interpret- ed (28, 29) to provide alarms when the sensing fiber loop is impinged upon by intrusive disturbances, and to provide location of disturbances along the loop. Means (33, 31) are incorporated to decode uniquely coded sonic or ultrasonic signals from personal transmitters (37) borne by authorized personnel approaching the sensing fiber loop. A remotely activated system disturber (25) is affixed to the sensing fiber loop which, when activated by an operator, provides positive confirmation of sensing loop continuity and system operability.

Affiliated with

Also associated with

Rating

Distributed fiber optic sensing system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Distributed fiber optic sensing system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Distributed fiber optic sensing system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1548885