dc.creator | Taylor, Henry F. | |
dc.creator | Lee, Chung E. | |
dc.date.accessioned | 2019-06-17T16:54:23Z | |
dc.date.available | 2019-06-17T16:54:23Z | |
dc.date.issued | 1993-03-16 | |
dc.identifier.uri | https://hdl.handle.net/1969.1/176477 | |
dc.description.abstract | Apparatus for sensing intrusion into a predefined perimeter comprises means for producing a coherent pulsed light, which is injected into an optical sensing fiber having a first predetermined length and positioned along the predefined perimeter. A backscattered light in response to receiving the coherent light pulses is produced and coupled into an optical receiving fiber. The backscattered light is detected by a photodetector and a signal indicative of the backscattered light is produced. An intrusion is detectable from the produced signal as indicated by a change in the backscattered light. To increase the sensitivity of the apparatus, a reference fiber and an interferometer may also be employed. | en |
dc.language | eng | |
dc.publisher | United States. Patent and Trademark Office | |
dc.rights | Public Domain (No copyright - United States) | en |
dc.rights.uri | http://rightsstatements.org/vocab/NoC-US/1.0/ | |
dc.title | Apparatus and method for fiber optic intrusion sensing | en |
dc.type | Utility patent | en |
dc.format.digitalOrigin | reformatted digital | en |
dc.description.country | US | |
dc.contributor.assignee | Texas A & M University System | |
dc.identifier.patentapplicationnumber | 07/737449 | |
dc.subject.uspcprimary | 340/557 | |
dc.subject.uspcother | 340/541 | |
dc.subject.uspcother | 340/600 | |
dc.subject.uspcother | 340/666 | |
dc.date.filed | 1991-07-29 | |
dc.publisher.digital | Texas A&M University. Libraries | |
dc.subject.cpcprimary | G01H 9/004 | |
dc.subject.cpcprimary | G01L 1/242 | |
dc.subject.cpcprimary | G01L 11/025 | |
dc.subject.cpcprimary | G08B 13/122 | |
dc.subject.cpcprimary | G08B 13/186 | |