光学
干涉测量
法布里-珀罗干涉仪
折射率
多路复用
干扰(通信)
材料科学
自由光谱范围
快速傅里叶变换
光功率
物理
激光器
灵敏度(控制系统)
波长
计算机科学
电子工程
电信
频道(广播)
工程类
算法
作者
Zongda Zhu,Dexin Ba,Lu Liu,Liqiang Qiu,Shunhu Yang,Yongkang Dong
出处
期刊:Optics Express
[The Optical Society]
日期:2021-06-03
卷期号:29 (12): 19034-19034
被引量:20
摘要
We proposed a novel temperature-compensated multi-point refractive index (RI) sensing system by the combination of the cascaded Fabry-Perot (FP) sensors and the frequency modulated continuous wave (FMCW) interferometry. The former is used for simultaneous sensing of RI and temperature, and the latter is used for multiplexing a series of the cascaded FP sensors to realize multi-point sensing. By means of Fourier transform-based algorithms, the interference spectra of each sub-FP sensors can be divided and demodulated independently. Experimentally, three cascaded FP sensors are multiplexed to verify multi-point RI and temperature sensing ability. RI sensitivity up to ∼1200 nm/RIU is obtained within RI range from 1.3330 to 1.3410, and temperature sensitivity up to ∼0.17 nm/°C is obtained within temperature range from 20 °C to 80 °C. The RI precision is as high as 10 −5 RIU and the temperature precision is as high as 0.05 °C. In addition, the prospective multiplexing number could reach about 4000 estimated by the minimum detectable light power. The proposed sensing system has potential advantages in the practical applications that require a large number sensing points.
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