SIMULTANEOUS MULTIPARAMETER MONITORING USING A SERIAL FIBER-FABRY-PEROT ARRAY WITH LOW-COHERENCE AND WAVELENGTH-DOMAIN DETECTION

Authors
HENDERSON PJ RAO YJ JACKSON DA ZHANG L BENNION I
Citation
Pj. Henderson et al., SIMULTANEOUS MULTIPARAMETER MONITORING USING A SERIAL FIBER-FABRY-PEROT ARRAY WITH LOW-COHERENCE AND WAVELENGTH-DOMAIN DETECTION, Measurement science & technology (Print), 9(11), 1998, pp. 1837-1839
Citations number
11
Categorie Soggetti
Instument & Instrumentation",Engineering
Journal title
Measurement science & technology (Print) → ACNP
ISSN journal
09570233
Volume
9
Issue
11
Year of publication
1998
Pages
1837 - 1839
Database
ISI
SICI code
0957-0233(1998)9:11<1837:SMMUAS>2.0.ZU;2-#
Abstract
A sensor multiplexing scheme for the simultaneous monitoring of dynami c strain and temperature is presented. The scheme combines low-coheren ce and wavelength-division signal processing with a serial array of fi bre-fabry-Perot (FFP) interferometric sensors defined by in-fibre grat ing mirrors of matched Bragg wavelength. Heterodyne measurements of si gnal phase from a 39 cm long FFP interferometer result in a dynamic st rain resolution of about 0.14 ns Hz(-1/2) at acoustic frequencies. Tem perature measurements via the induced changes in Bragg wavelength have a sensitivity of about 8 pm degrees C-1. The cross-talk between the s train and temperature channels is within the system noise.