Comparative study of fiber optic liquid level sensors based on long-period fiber gratings with different doping concentrations

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2012,（5）
• 页码范围: 7-10
• 页数: 4页
• 语种: 英文
• DOI: 10.3788/COL201210.050501

摘要

The performances of two liquid level sensors based on long-period fiber gratings are studied.The longperiod gratings (LPGs) have similar characteristics (length and period),but are fabricated with two photosensitive B-Ge co-doped fibers with different dopant concentrations.We investigate the temperature sensitivities of LPGs and exploit their refractive index sensitivity to implement liquid level measurement.By controlliug fiber parameters,such as the dopant concentrations,the measurement sensitivity of a LPG-based fiber optic liquid level sensor can be improved.