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    
Abstract/OtherAbstract:
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.
Authors:
Juan C Juarez; Henry F Taylor
Related Documents :
3168489 - Swelling evaluation of "scyliorhinus canicula l." cornea.
16004049 - Clinical system for interstitial photodynamic therapy with combined on-line dosimetry m...
11074619 - Visualization of nerve fiber orientation in gross histological sections of the human br...
15380429 - Capturing drops with a thin fiber.
20941319 - Measurement of up- and down-lead fiber sensitivity caused by the lead in a multimode fi...
19859329 - White-light scanning fiber michelson interferometer for absolute position-distance meas...
20457119 - Searching for triatomines. a new method for field search using uv light.
18491159 - Object localization with whiskers.
21180359 - Head-body ratio as a visual cue for stature in people and sculptural art.
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:  -    
Affiliation:
Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, USA. juan.juarez@jhuapl.edu
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Photorefractive real-time phase-coded optical correlation storage using a crossed cylindrical-collim...
Next Document:  Optical generation of millimeter-wave pulses using a fiber Bragg grating in a fiber-optics system.