Title :
A Miniature Fiber-Optic Refractive-Index Sensor Based on Laser-Machined Fabry–Perot Interferometer Tip
Author :
Ran, Zengling ; Rao, Yunjiang ; Zhang, Jian ; Liu, Zhiwei ; Xu, Bing
Author_Institution :
Key Lab. of Broadband Opt. Fiber Transm. & Commun. Networks Technol. (Minist. of Educ.), Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
A novel miniature fiber-optic Fabry-Perot (F-P) refractive-index (RI) sensor machined by 157 nm laser is proposed. The sensor head consists of a micro air F-P cavity near the tip of a single-mode fiber with a micro channel on the fiber tip used as both inlet and outlet for medium under test. Thin films are coated at reflective interfaces of the F-P cavity as mirrors to ensure high optical contrast, respectively. A RI resolution of 1130.887 nm/RI unit (RIU) is achieved by experiment. Such a sensor has a number of outstanding advantages when compared with other fiber-optic RI sensors, such as very small, rigid, high resolution, excellent linearity, wide measurement range, et al.
Keywords :
Fabry-Perot interferometers; fibre optic sensors; laser beam machining; refractive index; laser-machined Fabry-Perot interferometer tip; micro air F-P cavity; micro channel; miniature fiber-optic refractive-index sensor; sensor head; single-mode fiber; thin films; wavelength 157 nm; Fabry–Perot interferometer; fiber optics; laser-machining; refractive-index measurement;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2009.2031656
