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Type: Artigo
Title: Intensity Liquid Level Sensor Based On Multimode Interference And Fiber Bragg Grating
Author: Oliveira
Ricardo; Aristilde
Stenio; Osorio
Jonas H.; Franco
Marcos A. R.; Bilro
Lucia; Nogueira
Rogerio N.; Cordeiro
Cristiano M. B.
Abstract: In this paper an intensity liquid level sensor based on a single-mode-no-core-single-mode (SMS) fiber structure together with a Bragg grating inscribed in the later single mode fiber is proposed. As the no-core fiber is sensitive to the external refractive index, the SMS spectral response will be shifted related to the length of no-core fiber that is immersed in a liquid. By positioning the FBG central wavelength at the spectral region of the SMS edge filter, it is possible to measure the liquid level using the reflected FBG peak power through an intensity-based approach. The sensor is also self-referenced using the peak power of another FBG that is placed before and far from the sensing part. The temperature error analysis was also studied revealing that the sensor can operate in environments where the temperature changes are minimal. The possibility to use a second setup that makes the whole device temperature insensitive is also discussed.
Subject: Fiber Bragg Grating (fbg)
No-core Fiber (ncf)
Liquid Level Sensor
Multimode Interference (mmi)
Editor: IOP Publishing Ltd
Rights: fechado
Identifier DOI: 10.1088/0957-0233/27/12/125104
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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