Open AccessOptical pressure/acoustic sensor with precise Fabry-Perot cavity length control using angle polished fiber
Author(s) -
Wenhui Wang,
Nan Wu,
Ye Tian,
Xingwei Wang,
Christopher Niezrecki,
Julie Chen
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.016613
Subject(s) - materials science , fabry–pérot interferometer , optics , pressure sensor , optical fiber , fiber optic sensor , groove (engineering) , microphone , diaphragm (acoustics) , pressure measurement , photolithography , etching (microfabrication) , optoelectronics , sound pressure , acoustics , vibration , wavelength , mechanical engineering , physics , layer (electronics) , composite material , metallurgy , thermodynamics , engineering
This paper presents a novel Fabry-Perot (FP) optical fiber pressure/acoustic sensor. It consists of two V-shaped grooves having different sized widths, a diaphragm on the surface of the larger V-groove, and a 45 degrees angle-polished fiber. The precision of FP cavity length is determined by the fabrication process of photolithography and anisotropic etching of a silicon crystal. Therefore, the cavity length can be controlled on the order of ten nm. Sensors were fabricated and tested. Test results indicate that the sensors' cavity lengths have been controlled precisely. The packaged sensor has demonstrated very good static and dynamic responses compared to a commercially available pressure sensor and a microphone.