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8 April 2010 Study on the sensing performance of OFBG under large-scale negative strain
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As a new and sensitive sensing element, OFBG(Optical Fiber Bragg Grating) has been widely used in aerospace engineering and civil engineering. The sensing mechanism and properties have been widely studied by lots of researchers, but the sensing properties of OFBG under large negative strain are still destitute. In this paper, with the aids of large shrinkage performance of PP(polypropylene) during its curing, we gained about -13000 με's strain changes by embeding bare OFBG inside the PP bar to study the sensing properties of OFBG in this strain level. The results show that OFBG can remain its sensing properties well---- linearity, repeatability and the shape of centre wavelength are both reasonably. And the strain sensitivity coefficient of PP-OFBG is about 0.85 pm/με, this is very near with that of calculating results considering strain transmission between PP and OFBG. Which are all helpful and useful for further use of OFBG in other applications.
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Chuan Wang, Qingli Hu, and Jinping Ou "Study on the sensing performance of OFBG under large-scale negative strain", Proc. SPIE 7648, Smart Sensor Phenomena, Technology, Networks, and Systems 2010, 764816 (8 April 2010);

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