Open AccessPolymer optical fiber twisted macro-bend coupling system for liquid level detection
Author(s) -
Yuguang Hou,
Wenyi Liu,
Shan Su,
Huixin Zhang,
Jiawei Zhang,
Jun Liu,
Juan Xiong
Publication year - 2014
Publication title -
optics express
Language(s) - Danish
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.023231
Subject(s) - optics , materials science , total internal reflection , cladding (metalworking) , multi mode optical fiber , extinction ratio , coupling (piping) , optical fiber , single mode optical fiber , optoelectronics , physics , composite material , wavelength
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.