Abstract
Liquid level measurement in lab on a chip (LOC) devices is a challenging task due to the demand for a sensor with ultra-high resolution but miniature in nature. In this Letter, we report a simple, compact in size, yet highly sensitive liquid level sensor based on a hollow core fiber (HCF) structure. The sensor is fabricated by fusion splicing a short section of HCF between two singlemode fibers (SMFs). Sensor samples with different lengths of HCF have been studied; it is found that the sensor with a HCF length of shows the best sensitivity of , corresponding to a liquid level resolution of , which is over five times higher than that of the previous reported fiber optic sensors to date. In addition, experimental results have demonstrated that the proposed sensor shows good repeatability of measurement and a very low cross sensitivity to changes in the refractive index of the surrounding medium.
© 2019 Optical Society of America
Full Article | PDF ArticleMore Like This
Wenjun Ni, Ran Xia, Perry Ping Shum, Yiyang Luo, Yu Zheng, and Zhenggang Lian
Opt. Lett. 44(21) 5382-5385 (2019)
Junjie Wang, Qizhen Sun, Yanpeng Li, Shijie Tan, Liuyang Yang, Fang Fang, Zhijun Yan, and Deming Liu
Opt. Lett. 45(1) 169-172 (2020)
Dejun Liu, Qiang Wu, Wei Han, Fangfang Wei, Fengzi Ling, Rahul Kumar, Arun Kumar Mallik, Ke Tian, Changyu Shen, Gerald Farrell, Yuliya Semenova, and Pengfei Wang
Opt. Express 27(14) 19726-19736 (2019)