A Novel Temperature-Insensitive Hydrostatic Liquid-Level Sensor Using Chirped FBG

• Main Authors: Vorathin, E., Hafizi, Z.M., Aizzuddin, A.M., Zaini, Muhammad Khairol Annuar, Lim, Kok Sing
• Format: Article
• Published: Institute of Electrical and Electronics Engineers (IEEE) 2019
• Subjects: Q Science (General); QC Physics; TJ Mechanical engineering and machinery
• Online Access: http://eprints.um.edu.my/19961/; https://doi.org/10.1109/JSEN.2018.2875532

A novel half-bonded chirped fiber Bragg grating on a natural rubber diaphragm has been proposed to enhance the sensitivity and to compensate the temperature effects of a hydrostatic liquid-level sensor. This innovative fabrication method is resulted in the narrowing of the bandwidth with the hydrostatic pressure sensitivity recorded at-253 pm/kPa and water column sensitivity at-0.0253 nm/cm. The bandwidth modulation measurement was insensitive to temperature variations when compared with center wavelength modulation measurement. Furthermore, the proposed hydrostatic liquid-level sensor is compatible with a low-cost photodetector.