Highly Sensitive Trace Gas Detection Based on In-Plane Single-Quartz-Enhanced Dual Spectroscopy.

Tiantian Liang,Yufei Ma,Ziting Lang,Shunda Qiao

doi:10.3390/s22031035

Abstract

For this invited manuscript, an in-plane single-quartz-enhanced dual spectroscopy (IP-SQEDS)-based trace gas sensor was demonstrated for the first time. A single quartz tuning fork (QTF) was employed to combine in-plane quartz-enhanced photoacoustic spectroscopy (IP-QEPAS) with light-induced thermoelastic spectroscopy (LITES) techniques. Water vapor (H2O) was chosen as the target gas. Compared to traditional QEPAS, IP-SQEDS not only allowed for simple structures, but also obtained nearly three times signal amplitude enhancement.

Highlights

Trace gas detection has numerous significant applications in various fields, such as biomedical analyses [1,2], combustion diagnosis [3,4,5], atmospheric environmental monitoring [6,7,8,9], as well as petroleum exploration [10,11]
An in-plane single-quartz-enhanced dual spectroscopy (IPSQEDS) gas detection technique is reported for the first time, in which the laser beam is made parallel to the quartz tuning fork (QTF) plane and incident to the uncoated quartz at the bottom of the QTF, so that quartz-enhanced photoacoustic spectroscopy (QEPAS) and light-induced thermoelastic spectroscopy (LITES) signals are simultaneously excited in a single QTF
2f signal amplitude was measured as μV was generated from IP-QEPAS

Summary

Introduction

Trace gas detection has numerous significant applications in various fields, such as biomedical analyses [1,2], combustion diagnosis [3,4,5], atmospheric environmental monitoring [6,7,8,9], as well as petroleum exploration [10,11]. This technique is called quartz-enhanced photoacoustic spectroscopy (QEPAS). Coated in the middle of the two prongs [15,21] In this invited article, an in-plane single-quartz-enhanced dual spectroscopy (IPSQEDS) gas detection technique is reported for the first time, in which the laser beam is made parallel to the QTF plane and incident to the uncoated quartz at the bottom of the QTF, so that QEPAS and LITES signals are simultaneously excited in a single QTF.

Functional

Experimental Section

Results and Discussion

IP-SQEDS

Experimental results are shown shown in

Conclusions