基于光子晶体谐振腔的多通道光声光谱增强技术  

Multi-channel Photoacoustic Spectral Enhancement Technique Based on Photonic Crystal Resonator

作　　者：曹玲燕[1] 杨志勇[1] 李志军[1] CAO Ling-yan;YANG Zhi-yong;LI Zhi-jun(GUODIAN Nanjing Automation Co.,Ltd.)

机构地区：[1]国电南京自动化股份有限公司

出　　处：《化工自动化及仪表》2019年第11期924-927,共4页Control and Instruments in Chemical Industry

基　　金：国家自然科学基金项目(61605020,U1766217)

摘　　要：针对在线光声光谱进行低浓度物料检测时光谱吸收效应较低、准确性不高的问题,提出基于光子晶体谐振腔技术的多通道光声光谱增强技术,利用光子晶体谐振腔作为光声腔,采用DFB近红外激光器作为光源,通过结构改造设置特定波长的光集中反射于光子晶体谐振腔的中心空芯内,克服弯曲损耗增强待测物对光的吸收,从而获得高精度的光声光谱信号,使得光声光谱检测低浓度物质时更加准确。同时多通道的设计可以实现多种物质的不干扰检测。通过对C 2H 2、CO、CH 4的测量分析,发现光声信号有明显的增强,证实了该实验方案的可行性。Considering low spectral absorption effect and poor accuracy of the online photoacoustic spectroscopy in low concentration material detection,an enhancement technology for the photonic crystal resonator technique-based multi-channel photoacoustic spectroscopy was proposed,which employs photonic crystal resonant cavity as an optical cavity,takes DFB near infrared laser as the light source and through the structure improvement,sets a specific wavelength of light to reflect into the photonic crystal resonant cavity so as to overcome the bending loss of analyte to enhance light absorption and obtain high-accuracy photoacoustic signals and more accurate results in detecting the low-concentration substances’photoacoustic spectroscopy;meanwhile,the multi-channel design can achieve a variety of substances without interference detection.Measuring and analyzing C 2H 2,CO and CH 4 show that,the photoacoustic signal is obviously enhanced and this proves the feasibility of the experimental scheme.

关 键 词：低浓度物料检测 光声光谱增强技术 变压器油 溶解气体 光子晶体谐振腔技术 多通道 

分 类 号：TH83[机械工程—仪器科学与技术]