Design and numerical simulation of SPF-PCF-SPF fluid sensing system based on photoelectric oscillator  

作　　者：GUO Junqi YUE Yiting CUI Wei ZOU Xinhai YANG Haoyu YANG Junkai 

机构地区：[1]Chongqing Engineering Research Center of Intelligent Sensing Technology and Microsystem,Chongqing University of Post and Telecommunications,Chongqing 400065,China

出　　处：《Optoelectronics Letters》2022年第6期326-330,共5页光电子快报（英文版）

基　　金：supported by the Science and Technology Research Program of Chongqing Municipal Education Commission(Nos.KJQN201800626 and KJQN20200605);the National Key R&D Program of China(No.2018YFF01010202);the Basic Research Project of Chongqing Science and Technology Commission(No.CSTC-2018jcyjax0619);。

摘　　要：In this paper,an optical fiber fluid sensing system based on optoelectronic oscillator(OEO)was proposed and studied numerically.The fluid sensor head is constructed by splicing two sections of side-polished fiber(SPF)to one section of photonic crystal fiber(PCF).Fluid sample can flow continuously through the holes of PCF.The refractive index(RI)change of the fluid sample can lead to the effective RI change of the fiber,resulting in frequency change of microwave signal generated by OEO.By monitoring the oscillation frequency using an electronic spectrum analyzer(ESA),the RI of fluid sample can be measured.Thanks to the fast interrogation speed of ESAs,the measuring speed can be increased significantly compared to traditional optical fiber RI sensing systems using optical spectrometers.The sensing principle of the system was studied.The sensitivity of the proposed system was evaluated by simulation,and an RI sensitivity of-14.20 MHz/RIU can be achieved.The results show that with proper system design,real-time RI measurement with high sensitivity can be achieved.Increasing the length of the PCF while under the premise of the fluid parameters will be the most reasonable way to improve the sensitivity.The proposed design and simulation results can provide suggestions for the fabrication and optimization of fluid sensing systems used for real-time detection and measurement of biological elements and heavy metal ions in liquid environment.

关 键 词：fiber OSCILLATOR system 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]