title: Polymer optical fiber twisted macro-bend coupling system for liquid level detection.
abstract: The liquid level detection principle of cladding mode frustrated total internal reflection (CMFTIR) effect is proposed. The significant enhancement of CMFTIR effect is realized through macro-bend coupling system in which the dark-field coupling phenomenon between two multimode polymer optic fibers is observed through experiment. Especially twisted macro-bend coupling structure (TMBCS) is adopted to achieve stable coupling of two naked POF. The testing result showed that the dark-filed forward coupling efficiency reached 2‰ and the extinction ratio of the liquid level probe reached 4.18 dB. Compared with existing optical fiber liquid level sensors, the TMBCS probe is simpler, robuster, and cheaper. In addition, the TMBCS has the potential for displacement or stress sensing.
authors.forename: Yu-Long
authors.initials: YL
authors.lastname: Hou
authors.forename: Wen-Yi
authors.initials: WY
authors.lastname: Liu
authors.forename: Shan
authors.initials: S
authors.lastname: Su
authors.forename: Hui-Xin
authors.initials: HX
authors.lastname: Zhang
authors.forename: Jia-Wei
authors.initials: JW
authors.lastname: Zhang
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
authors.forename: Ji-Jun
authors.initials: JJ
authors.lastname: Xiong
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D005336:Fiber Optic Technology / Q000295:instrumentation*; D008027:Light; D055100:Optical Fibers; D011108:Polymers; D012031:Refractometry / Q000295:instrumentation
chemical_list: D011108:Polymers