A Multipoint Liquid Level Sensor Based on Two Twisted Polymer Optical Fibers in a Race-Track Helical Structure. (4th June 2018)

• Record Type: Journal Article
• Authors: Zhang, Yingzi; Hou, Yulong; Zhang, Yanjun; Zhang, Liang; Hu, Yanjun; Gao, Xiaolong; Zhang, Huixin; Liu, Wenyi
• Other Names: Gupta Banshi D. Academic Editor.
• Is Part Of: Journal of sensors. Volume 2018(2018)
• Publication Date: 2018-06-04
• Subjects: Detectors -- Periodicals; 681.205
• DOI: 10.1155/2018/4914382
• Languages: English
• ISSNs: 1687-725X

Abstract

Abstract : A multipoint liquid level sensor based on the RI modulation of macrobend polymer optical fiber (POF) couplers is proposed. By twinning two twisted POFs around a race-track column, a series of U-shaped sensing heads are achieved. The output power in the passive fiber declines in a step form while the sensing heads are immersed into liquid in turn. The introduction of UV optical cement in the gap between two POFs improves the side-coupling ratio, increasing the attenuation per step. For the measurement range of 100 cm, the resolution is 2 cm. The sensor can differentiate different liquids with low temperature dependence.