Optical Fiber Specklegram Chemical Sensor Based on a Concatenated Multimode Fiber Structure

被引：47

作者：

Fujiwara, Eric ^{[1
]}

da Silva, Luiz Evaristo ^{[2
]}

Cabral, Thiago Destri ^{[2
]}

de Freitas, Hugo Eugenio ^{[2
]}

Wu, Yu Tzu ^{[1
]}

de Barros Cordeiro, Cristiano Monteiro ^{[2
]}

机构：

[1] Univ Estadual Campinas, Sch Mech Engn, Lab Photon Mat & Devices, BR-13083860 Campinas, SP, Brazil

[2] Univ Estadual Campinas, Gleb Wataghin Inst Phys, BR-13083859 Campinas, SP, Brazil

来源：

JOURNAL OF LIGHTWAVE TECHNOLOGY | 2019年 / 37卷 / 19期

基金：

巴西圣保罗研究基金会;

关键词：

Chemical sensors; fiber specklegram sensor; optical fiber sensors; HIGH-SENSITIVITY; MODAL NOISE; TEMPERATURE; INTERFERENCE; EXCITATION; PATTERN;

D O I：

10.1109/JLT.2019.2927332

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页码：5041 / 5047

页数：7

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