摘要
设计了一种非一维共振腔的圆柱腔,利用入射声波与反射声波之间的共振增强效应来增大传感系统信号强度,并应用在面外入射的石英增强光声光谱技术(QEPAS)和石英增强光致热弹光谱技术(LITES)技术中。对添加圆柱腔前后的石英音叉摆幅和圆柱腔位置进行了理论模拟与优化。实验中,采用水汽为目标探测气体和输出波长1.395μm的半导体激光器为激发源,相比未添加圆柱腔的裸石英音叉系统,添加圆柱腔的QEPAS和LITES系统探测极限分别改善了2.32倍和1.27倍。
Gas sensing technology can detect gas concentration with high sensitivity and has significant application demands in the fields such as atmospheric chemistry,hazardous gas monitoring,etc.Compared with the non-spectral gas sensing technology,spectral technology utilizes the characteristic fingerprint spectrum of gas molecules,so it has excellent selectivity.The traditional photoacoustic spectroscopy technology employs the microphone as the acoustic detection element.However,the problems of the microphone itself,such as low Q value,wide response band,large background noise,and the large volume of the photoacoustic cell,restrict the practical application of this technology.In contrast to this,Quartz-Enhanced Photoacoustic Spectroscopy(QEPAS)and Light-Induced Thermoelastic Spectroscopy(LITES)take the Quartz Tuning Fork(QTF)as the acoustic wave detection element and light energy detection element respectively.Due to QTF having the characteristics of a narrow response frequency band(~4 Hz),high Q value(~10000),an unnecessary photoacoustic cell,and so on,QEPAS has the advantages of anti-noise,small size,compact structure,low price,and so on,while LITES also has the advantage of non-contact detection.QEPAS and LITES have developed rapidly in recent years,and it has become a hotspot in gas sensing.Considering that both QEPAS and LITES technology can generate photoacoustic signals in the experiment and microresonators are usually devoted to increasing the acoustic signal strength.Therefore,in this manuscript,based on the resonance enhancement effect between the incident acoustic wave and the reflected acoustic wave,a non-one-dimensional resonant cylindrical cavity was designed to enhance the signal strength of the sensing systems and is first applied in out-of-plane incident QEPAS and LITES techniques.Firstly,the simulation model of QTF was established using the QTF size with the standard frequency of 32.768 kHz and was defined as a piezoelectric material.A cylindrical cavity was constructed near the QTF.Subsequently,the f
作者
梁添添
洪颖昊
马欲飞
LIANG Tiantian;HONG Yinghao;MA Yufei(National Key Laboratory of Science and Technology on Tunable Laser,Harbin Institute of Technology,Harbin 150001,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2023年第3期178-187,共10页
Acta Photonica Sinica
基金
国家自然科学基金(Nos.62022032,61875047,61505041)
黑龙江省优秀青年科学基金(No.YQ2019F006)
黑龙江省博士后科研启动金(No.LBH-Q18052)
中央高校基本科研业务费专项资金。
关键词
石英增强光声光谱技术
石英增强光致热弹光谱技术
圆柱腔
气体传感
石英音叉
Quartz-enhanced photoacoustic spectroscopy
Light-induced thermoelastic spectroscopy
Cylindrical cavity
Gas Sensing
Quartz tuning fork
