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Improvement of measuring range in fiber interferometric liquid level sensor by employing digital filter for mode selectivity
Author(s) -
Azmi Asrul Izam,
Abdullah Ahmad Sharmi,
Mohd Noor Muhammad Yusof,
Ibrahim Mohd Haniff,
Sheikh Usman Ullah,
Raja Ibrahim Raja Kamarulzaman,
Tan Tao,
Zhang Jianzhong
Publication year - 2020
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32408
Subject(s) - interferometry , fiber optic sensor , materials science , cladding (metalworking) , linearity , optics , optical fiber , mach–zehnder interferometer , sensitivity (control systems) , cladding mode , electronic engineering , polarization maintaining optical fiber , physics , engineering , metallurgy
A liquid level sensor system based on dual tapers all‐fiber Mach‐Zehnder interferometer incorporating digital filtering is proposed for extended measurement range. Digital filtering technique is employed to selectively isolate beating of a particular dominant cladding mode, resulting a more consistent response in terms of spectra quality and wavelength shift. Sensing characteristics of cladding modes also are studied theoretically and experimentally. From experiment, continuous measurement of water level is demonstrated over 1016‐mm range with sensitivity of −0.0021 nm/mm and R 2 of 0.9972. To our knowledge, this is the highest measurement range and linearity for liquid level sensor based on interferometric sensing system has been reported. The proposed technique can be very useful to enhance sensing performance for various fiber interferometric sensor applications.