title: Compact micro-displacement sensor with high sensitivity based on a long-period fiber grating with an air-cavity.
abstract: We proposed and experimentally demonstrated a compact micro-displacement sensor with high sensitivity based on a long-period fiber grating (LPG) with an air-cavity. The sensor head is obtained by composing an air-cavity with the ends of a LPG and a single mode fiber (SMF). The wavelength shift of the LPG has a linear relationship with the length of the air gap which agrees well with the theoretical analysis. The experimental results show that the sensitivity is ~0.22 nm/µm within the micro-displacement range of 0 to 140 µm.
authors.affiliation: Institute of Optoelectronic Technology, China Jiliang University, Hangzhou, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Qi
authors.forename: Chun-Liu
authors.initials: CL
authors.lastname: Zhao
authors.forename: Yunpeng
authors.initials: Y
authors.lastname: Wang
authors.forename: Juan
authors.initials: J
authors.lastname: Kang
authors.forename: Zaixuan
authors.initials: Z
authors.lastname: Zhang
authors.forename: Shangzhong
authors.initials: S
authors.lastname: Jin
mesh_terms: D000388:Air; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D008904:Miniaturization; D012031:Refractometry / Q000295:instrumentation*; D014159:Transducers