9 November 2010 A strain sensor based on cladding mode resonance of optical double-cladding fiber
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Abstract
A strain sensor based on cladding mode resonance of optical double-cladding fiber (DCF) was proposed and experimentally demonstrated. The sensor head was fabricated by splicing a section of DCF into a standard single mode fiber (SMF). Attributed to the thin thickness of the inner cladding, the core mode can be coupled with cladding modes which generatess a strong resonant spectrum at the phase-matching wavelength. When the DCF sensor is applied an axial strain, the refractive index of the DCF decreases due to the photoelastic effect. According to the coupled mode theory, the phase-matching wavelength will shift to a shorter wavelength. By detecting the resonant spectrum variation, the stain sensor can be realized. The strain sensitivity was achieved as -2.87 pm με over 800με measurement range with good repeatability. With the simple configuration and attractive performance, the specialty DCF strain sensor can be explored for wide sensing applications.
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Jian Zhang, Jian Zhang, Fufei Pang, Fufei Pang, Hairun Guo, Hairun Guo, Zhenyi Chen, Zhenyi Chen, Tingyun Wang, Tingyun Wang, } "A strain sensor based on cladding mode resonance of optical double-cladding fiber", Proc. SPIE 7853, Advanced Sensor Systems and Applications IV, 78533U (9 November 2010); doi: 10.1117/12.871732; https://doi.org/10.1117/12.871732
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