Continuous Liquid-Level Sensor Based on a Long-Period Grating and Microwave Photonics Filtering Techniques

A fiber optic liquid-level sensor based on a long period grating (LPG) is proposed and experimentally validated. The principle of operation is based on a technique used to analyze microwave photonics filters. A 4-cm-long LPG cascaded with a high-reflectivity fiber Bragg grating is employed to achiev...

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Bibliographic Details
Published in:IEEE sensors journal 2016-03, Vol.16 (6), p.1652-1658
Main Authors: Ricchiuti, Amelia Lavinia, Barrera, David, Urrutia, Aitor, Goicoechea, Javier, Arregui, Francisco J., Sales, Salvador
Format: Article
Language:English
Subjects:
Continuous fibers
continuous sensors
Diffraction gratings
Fiber optic sensors
Filtering
Gratings (spectra)
liquid level sensors
Liquids
long period gratings
LPG
Microwave filters
Microwave photonics
microwave photonics filters
Optical attenuators
Optical fiber sensors
Optical fibers
Photonics
Sensors
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Summary:A fiber optic liquid-level sensor based on a long period grating (LPG) is proposed and experimentally validated. The principle of operation is based on a technique used to analyze microwave photonics filters. A 4-cm-long LPG cascaded with a high-reflectivity fiber Bragg grating is employed to achieve a continuous liquid-level sensor. The measurements have been performed using a modulator and a photo-detector with a modest bandwidth of less than 500 MHz, showing a sensitivity of -12.71 dB/cm and a standard deviation of 0.52 dB. One of the significant advantages of such sensing structure is that it is based on low-bandwidth radio frequency and off-the-shelf photonic components. In addition, the simple proposed scheme presents good repeatable performance and proves to be intrinsically robust against environmental changes, stable, and easy to reconfigure.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2015.2504131