A fiber optical inclinometer based on modal interferometer is demonstrated for bend angle sensing. The device consists of a piece of simplified hollow core photonic crystal fiber sandwiched between single mode fibers with lateral offset. The measurement of bend angles up to 45° is demonstrated, and the spectrum exhibits a blueshift of over 50 nm. The sensitivity is found to increase with the applied bend angles and reaches at 45°, and the response is independent of the direction of bending. A low temperature sensitivity of is observed between room temperature and 1000°C. Due to its capacity for withstanding high temperature, the device can work as a direction-independent inclinometer in high-temperature environments.
© 2013 Optical Society of AmericaFull Article | PDF Article
Zhu Yong, Chun Zhan, Jon Lee, Shizhuo Yin, and Paul Ruffin
Opt. Lett. 31(12) 1794-1796 (2006)
Li-Yang Shao and Jacques Albert
Opt. Lett. 35(7) 1034-1036 (2010)
Shanshan Zhang, Weigang Zhang, Shecheng Gao, Pengcheng Geng, and Xiaolin Xue
Opt. Lett. 37(21) 4480-4482 (2012)