材料科学
光学
制作
光纤
信号(编程语言)
干涉测量
光纤传感器
灵敏度(控制系统)
相对湿度
熔接
飞秒
解调
光电子学
激光器
物理
医学
替代医学
病理
电子工程
计算机科学
程序设计语言
工程类
频道(广播)
电气工程
热力学
作者
Yu Wang,Wenbo Yuan,Yaxi Yan,Lian Zhang,Daru Chen,Alan Pak Tao Lau,Yu Chen,Chao Lu
出处
期刊:Optics Express
[The Optical Society]
日期:2023-08-11
卷期号:31 (17): 28636-28636
被引量:1
摘要
A novel inline Fabry-Perot interferometer (FPI) for simultaneous relative humidity (RH) and temperature monitoring is proposed. The sensing probe consists of a section of hollow core Bragg fiber (HCBF) spliced with a single-mode fiber pigtail. The end-face of the HCBF is coated with Chitosan and ultraviolet optical adhesive (UVOA), forming two polymer layers using a well-designed fabrication process. The surfaces of the layers and splicing point will generate multiple-beam interference and form Vernier-effect (VE) related envelopes in the reflection spectrum. A signal processing (SP) method is proposed to demodulate the VE envelopes from a complicated superimposed raw spectrum. The principle of the SP algorithm is analyzed theoretically and verified experimentally. The sensor’s RH and temperature response are studied, exhibiting a high sensitivity of about 0.437 nm/%RH and 0.29 nm/ ∘ C, respectively. Using a matrix obtained from experiment results, the simultaneous RH and temperature measurement is achieved. Meanwhile, the simple fabrication process, compact size and potential for higher sensitivity makes our proposed structure integrated with the SP algorithm a promising sensor for practical RH and temperature monitoring.
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