We demonstrate highly sensitive temperature and strain sensors based on an all-fiber Lyot filter structure, which is formed by concatenating two 45°-TFGs (tilted fiber gratings) with a PM fiber cavity. The experiment results show the all-fiber 45°-TFG Lyot filter has very high sensitivity to strain and temperature. The 45°-TFG Lyot filters of two different cavity lengths (18cm and 40 cm) have been evaluated for temperature sensing by heating a section of the cavity from 10°C to 50°C. The experiment results have shown remarkably high temperature sensitivities of 0.616nm/°C for 18cm and 0.31nm/°C for 40cm long cavity filter, respectively. The 18cm long cavity filter has been subjected to strain variations up to around 550μ ε and the filter has exhibited strain sensitivities of 0.02499nm/μ ε and 0.012nm/μ ε for two straining situations, where its cavity middle section of 18cm and 9cm were stretched, respectively.
|Title of host publication||Optical sensing and detection II|
|Editors||Francis Berghmans, Anna G. Mignani, Piet de Moor|
|Number of pages||8|
|Publication status||Published - 16 Apr 2012|
|Event||Optical sensing and detection II - Brussels, Belgium|
Duration: 16 Apr 2012 → 19 Apr 2012
|Conference||Optical sensing and detection II|
|Period||16/04/12 → 19/04/12|
Bibliographical noteZhijun Yan ; Adebayo Adedotun ; Kaiming Zhou and Lin Zhang, "Highly sensitive temperature and strain sensors based on all-fiber 45°-TFG Lyot filter", Proc. SPIE 8439, Optical Sensing and Detection II, 843905 (April 23, 2012).
Copyright 2012 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic 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.
- Lyot filter