| Title |
Study on Dependence of Polarization-Maintaining Photonic Crystal Fiber-Based Polarimetric Strain Sensor on Sensing Fiber Length |
| Authors |
Tae-Kyu Noh ; Yong-Wook Lee |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2013.27.2.001 |
| Keywords |
Photonic Crystal Fiber ; Strain Sensor ; Sagnac Birefringence Interferometer |
| Abstract |
In this paper, we implemented a polarimetric strain sensor using a Sagnac birefringence interferometer composed of a polarization-maintaining photonic crystal fiber (PM-PCF). By changing the length of the PM-PCF employed as the sensor head of the proposed sensor, the length dependence of the strain sensitivity was investigated. With respect to 5.0-, 7.5-, and 10.0-cm-long PM-PCFs, strain measurements were done in a measurement range of 0～6mε, and strain sensitivities of ∼2.04, ∼1.92, and ∼1.73pm/με were obtained, respectively. If an ideal PM-PCF with no length dependence of a modal birefringence is used for the proposed sensor, the strain sensitivity is independent of the length of the sensor head (PM-PCF). In the practical PM-PCF used in experiments, however, a shorter PM-PCF has a higher length dependence of the modal birefringence due to its imperfectness and nonuniformity of the internal structure, resulting in a higher length dependence of the strain sensitivity. |