Abstract
Coupled sensitivity of optical fiber sensors to structural strain and temperature
has been a long lasting problem for reliable measurements in environments where both
parameters are varying. This problem has been a driving force for the employment of
methods to compensate the effect of one parameter. In this paper, a packaged
dual-parameter optical fiber Bragg grating (FBG) sensor for the simultaneous measurement
of structural strain and temperature using a single FBG is presented. The sensor
consists of FBGs with on-fiber silver thin films synthesized by a laser direct write
method. The new sensor design, fabrication, packaging, and calibration are addressed. A
customized test rig and a sensor calibration package are designed and built. The
performance of the sensor for the concurrent measurement of strain and temperature is
investigated by analyzing the experimental data, and the characteristic curves for the
calibration of the sensor are presented.
© 2013 IEEE
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