Rapid and sensitive detection of ammonia in water by a long period fiber grating sensor coated with sol-gel silica

被引：13

作者：

Gan, Wenbo ^{[1
,2
]}

LI, Yaowei ^{[1
,2
]}

Liu, Ting ^{[1
,2
]}

Yang, Yitao ^{[1
,2
]}

Song, Baoan ^{[1
,2
,3
]}

Dai, Shixun ^{[1
,2
,3
]}

Xu, Tiefeng ^{[1
,4
]}

Wang, Yin ^{[5
]}

Lin, Ting-Jung ^{[4
,5
]}

Zhang, Peiqing ^{[1
,2
,3
]}

机构：

[1] Ningbo Univ, Adv Technol Res Inst, Lab Infrared Mat & Devices, Ningbo 315211, Zhejiang, Peoples R China

[2] Key Lab Photoelect Detect Mat & Devices Zhejiang P, Ningbo 315211, Zhejiang, Peoples R China

[3] Ningbo Univ, Engn Res Ctr Adv Infrared Photoelect Mat & Devices, Ningbo 315211, Peoples R China

[4] Ningbo Inst Oceanog, Ningbo 315832, Peoples R China

[5] HealthyPhoton Co Ltd, 119 Zicheng Rd,Ningbo Innovat Pk, Ningbo 315105, Zhejiang, Peoples R China

来源：

OPTICS EXPRESS | 2022年 / 30卷 / 19期

基金：

中国国家自然科学基金;

关键词：

LPFG SENSOR; THIN-FILM;

D O I：

10.1364/OE.472205

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A sensitive ammonia sensor based on long-period fiber grating (LPFG) is designed and manufactured for the detection of ammonia concentration in water. Femtosecond laser direct writing technology is used to write LPFGs on standard single-mode silica fiber. A thin layer doped with basic dyes is coated on the optical fiber for sensing by using the sol-gel method. The thicknesses of sol-gel layers, which play a key role in the sensitivity of the LPFG sensor, were carefully studied. Experimental results show that LPFG with a functional layer of similar to 340 nm has the best sensing performance, and the detection limit is 0.08 ppm. The response time of the sensor is less than one minute, and the sensor has good repeatability with a short recovery time. Compared with other organic molecules and ions in water, the proposed LPFG sensor has not only good reusability, but also selectivity for the detection of ammonia. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

引用

页码：33817 / 33825

页数：9

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