Document Detail

Field test of a distributed fiber-optic intrusion sensor system for long perimeters.
MedLine Citation:
PMID:  17384709     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Field tests in desert terrain of a distributed sensor system for detecting and locating intruders based on the phase-sensitive optical-time-domain reflectometer (phi-OTDR) are described. The sensing element is a single-mode telecommunications fiber in a 4.5 mm diameter cable buried in a trench filled with loose sand. Light pulses from a continuous-wave Er:fiber Fabry-Perot laser with a narrow (<3 kHz) instantaneous linewidth and low (few kilohertz per second) frequency drift are injected into one end of the fiber, and the orthogonal polarizations of the backscattered light are monitored with separate receivers. Localized phase changes in the optical carrier are sensed by subtracting a phi-OTDR trace from an earlier stored trace. High sensitivity and consistent detection of intruders on foot and of vehicles traveling down a road near the cable line was realized over a cable length of 8.5 km and a total fiber path of 19 km in real time.
Juan C Juarez; Henry F Taylor
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied optics     Volume:  46     ISSN:  0003-6935     ISO Abbreviation:  Appl Opt     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-03-26     Completed Date:  2007-07-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0247660     Medline TA:  Appl Opt     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1968-71     Citation Subset:  -    
Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, USA.
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