Optical fibre strain sensors using Fibre Bragg Gratings (FBGs) are poised to play a major role in structural health monitoring in a variety of application from aerospace to civil engineering. At the heart of technology is the optoelectronic instrumentation required to convert optical signals into measurands. Users are demanding compact, lightweight, rugged and low cost solutions. This paper describes development of a new device based on a blazed FBG and CCD array that can potentially meet the above demands. We have shown that this very low cost technique may be used to interrogate a WDM array of sensor gratings with highly accurate and highly repeatable results unaffected by the polarisation state of the radiation. In this paper, we present results showing that sensors may be interrogated with an RMS error of 1.7pm, drift below 0.12pm and dynamic range of up to 65nm.
|Title of host publication||Industrial and highway sensors technology|
|Editors||Brian Culshaw, Michael A. Marcus, John P. Dakin, Samuel D. Crossley, Helmut E. Knee|
|Number of pages||8|
|ISBN (Print)||978-0-8194-5161-3, 0-8194-5161-4|
|Publication status||Published - 28 Mar 2004|
|Event||Industrial and highway sensors technology - Providence, RI, United States|
Duration: 28 Oct 2003 → 30 Oct 2003
|Conference||Industrial and highway sensors technology|
|Period||28/10/03 → 30/10/03|
Bibliographical noteAlexander G. Simpson ; Kaiming Zhou ; Peter Foote ; Lin Zhang and Ian Bennion, "Polarization-independent high-resolution spectral interrogation of FBGs using a BFBG-CCD array for optical sensing applications", Proc. SPIE 5272, Industrial and Highway Sensors Technology, 324 (March 8, 2004); doi:10.1117/12.516089.
Copyright 2003 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
- tilted or blazed gratings
- optical sensor interrogation