Abstract
The bending response of polymer optical fibre Bragg grating (POFBG) and silica optical fibre Bragg grating (SOFBG) mounted on a brass beam have been systematically studied and compared. The results indicate that POFBG has higher (almost twice as much) bend sensitivity than SOFBG. Based on the difference between the bend and temperature sensitivity of POFBG and SOFBG, a new method of measuring vector bend and temperature simultaneously was proposed by using a hybrid sensor head with series connection of one POFBG and one SOFBG with different Bragg wavelengths. It provides high sensitivity and resolution for sensing bend and temperature changes simultaneously and independently. The proposed sensor can find some applications in the fields where high sensitivity for both bend and temperature measurements are required.
Highlights
Sensing has become a key enabling technology in many areas, from entertainment to health and transportation
The difference for polymer optical fibre Bragg grating (POFBG) is larger than that for silica optical fibre Bragg grating (SOFBG), which might be due to the viscoelasticity of the polymer optical fibre (POF)
The fixing with sticky tape has great influence upon POFBG compared with SOFBG
Summary
Sensing has become a key enabling technology in many areas, from entertainment to health and transportation. Simultaneous humidity and temperature sensing have been achieved with a Zeonex/poly (methyl methacrylate) (PMMA) micro-structured polymer optical fiber (mPOF) Bragg grating pair [15]. A vector bend sensor with a high sensitivity of 937 pm/m−1 has been obtained based on a polymer and silica fibre Bragg grating pair for the greater enhancement of the sensitivity than a single fibre grating [26]. We propose to use the polymer and silica fibre Bragg grating pair for the simultaneous vector bend and temperature sensing. The mounting influence and stability have been further studied and analysed
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