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The sensing properties with strain and temperature of tapered FBG had been researched both theoretically and experimentally. Based on tapered FBG and thin-wall strain cylinder structure, a novel temperature-independent high pressure sensor was fabricated and investigated. The tapered FBG performed as a chirped grating, whose bandwidth and reflection power broadened and increased when the pressure applied on it. Moreover, the bandwidth and the reflection power were temperature-independent. So the value of the strain can be obtained by detecting the reflection power. This method effectively solved the cross-sensitivity problem. The experiment results indicated that this sensor provided a measurement range of 0~40MPa with a sensitivity of 0.04μw/MPa, low cost and good application prospect.
Photonics and Optoelectronic (SOPO), 2010 Symposium on
Date of Conference: 19-21 June 2010