Abstract
The performances of two liquid level sensors based on long-period fiber
gratings are studied. The long-period 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 controlling fiber parameters, such as the dopant concentrations, the
measurement sensitivity of a LPG-based fiber optic liquid level sensor can be
improved.
© 2012 Chinese Optics Letters
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