Open AccessBalanced polarization maintaining fiber Sagnac interferometer vibration sensor
Author(s) -
Kenji Wada,
Hirokazu Narui,
Daiki Yamamoto,
Tomohiro Matsuyama,
Hiromichi Horinaka
Publication year - 2011
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.021467
Subject(s) - optics , interferometry , fiber optic sensor , optical fiber , vibration , polarization maintaining optical fiber , fibre optic gyroscope , materials science , polarization (electrochemistry) , sagnac effect , physics , acoustics , chemistry
To achieve a nearly zero-delay operating point in a polarization-maintaining (PM) fiber Sagnac interferometer, two identical PM fibers were incorporated so that their two main axes were orthogonally coupled to each other. A simple fiber vibration sensor system was constructed with a light emitting diode and a balanced PM fiber Sagnac interferometer, in which one of the PM fibers was used as a sensing cable and the other as a reference cable. The vibration sensor was confirmed to be temperature-compensated and generated a phase shift per unit length and unit strain of the sensor of 4.7 milliradian/(m·με) when mechanical vibrations with 1 kHz sinusoidal and triangular waves were stably observed under an input power of 10 μW.