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Type: Artigo
Title: Optical fiber specklegram chemical sensor based on a concatenated multimode fiber structure
Author: Fujiwara, Eric
Silva, Luiz Evaristo da
Cabral, Thiago Destri
Freitas, Hugo Eugênio de
Wu, Yu Tzu
Cordeiro, Cristiano Monteiro de Barros
Abstract: An optical fiber specklegram chemical sensor based on a concatenated multimode-no-core-multimode structure is reported. The 30 mm-no-core section is immersed in the analyzed liquid so the number of excited modes is modulated by the surrounding refractive index value, affecting the interference of the several propagating modes and consequently the output specklegram, whose changes are quantified by the zero mean normalized cross-correlation coefficient. The sensor was evaluated on the measurement of ethanol-water solutions, resulting in 18.7 RIU-1 sensitivity (5 x 10(-4) resolution) for the 1.33 to 1.36 refractive index interval, besides 0.07 degrees C-1 temperature sensitivitywithin the 26-32. Crange. Moreover, the systemwas also tested on liquid level measurements, yielding 0.05 mm(-1) sensitivity and 0.2 mm resolution. The results are comparable to previously reported multimodal interferometers based onmore complicated interrogation schemes, indicating that the specklegram sensor is a feasible alternative for the sensitive and straightforward measurement of liquid samples.
Subject: Detectores químicos
Detectores de fibra ótica
Chemical detectors
Optical fiber detectors
Country: Estados Unidos
Editor: Institute of Electrical and Electronics Engineers
Rights: fechado
Identifier DOI: 10.1109/JLT.2019.2927332
Date Issue: 2019
Appears in Collections:IFGW - Artigos e Outros Documentos

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