期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 37, 期 19, 页码 5041-5047出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2019.2927332
关键词
Chemical sensors; fiber specklegram sensor; optical fiber sensors
资金
- Sao Paulo Research Foundation (FAPESP) [2017/25666-2, 2014/50632-6]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal e Nivel Superior (CAPES) [001]
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据