Abstract
A fiber sensor based on a Fabry–Perot cavity is reported for measuring mixtures of water and glycerin. The sensor is fabricated by producing an air bubble near the end face of a multimode fiber section, and reshaping the tip in order to produce a thin silica diaphragm. It is observed that there is dependence between diaphragm dimensions and the structure sensitivity. The sensor with a 20 μm thick diaphragm presents a sensitivity of 7.81 pm/wt.% regarding the variation of water mass fraction in glycerin. With this sensing head, an experimental resolution of 2.5 wt.% is estimated. By converting the mass fraction into refractive index variations, a maximum sensitivity of 5.49 nm/RIU is obtained. Moreover, given the low-temperature sensitivity (1.6 pm/ °C), the proposed cavity should be adequate to perform temperature independent measurements. The purity degree of glycerin is one of the most important parameters to be determined in applications such as in pharmaceutical or cosmetic area. The proposed sensor can be an alternative to the previously developed ones.
© 2017 IEEE
PDF Article
More Like This
High-sensitivity strain sensor based on in-fiber improved Fabry–Perot interferometer
Shen Liu, Yiping Wang, Changrui Liao, Guanjun Wang, Zhengyong Li, Qiao Wang, Jiangtao Zhou, Kaiming Yang, Xiaoyong Zhong, Jing Zhao, and Jian Tang
Opt. Lett. 39(7) 2121-2124 (2014)
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription