Journal
OPTICS EXPRESS
Volume 23, Issue 12, Pages 15372-15379Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.015372
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Funding
- National Natural Science Foundation of China [61377095, 11274182, 11204212]
- 863 National High Technology Program of China [2013AA014201]
- Key Natural Science Foundation Project of Tianjin [13JCZDJC26100]
- China Postdoctoral Science Foundation [2012M520024]
- National Key Basic Research and Development Program of China [2010CB327605]
- Fundamental Research funds for the Central Universities
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A highly sensitive optical fiber twist sensor has been proposed by employing a Sagnac interferometer based on polarization-maintaining elliptical core fibers (PM-ECFs). The twist effects have been theoretically analyzed and experimentally demonstrated. Based on the photoelastic effect, the resonance wavelength linearly shifts with the increment of twist and the wavelength shift is also dependent on the torsion direction. The maximum torsion sensitivities reach 18.60nm/(rad/m) for clockwise (CW) torsion direction and 15.83nm/(rad/m) for anticlockwise (ACW) torsion direction, respectively. To eliminate the temperature cross-sensitivity effect, a sensor matrix for simultaneous measurement of twist and temperature has also been obtained. Moreover, theoretical and experimental investigations indicate that by optimizing the refractive index difference between the core and cladding, core ellipticity and cladding diameter, the twist sensitivity could be further improved. (C) 2015 Optical Society of America
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