A quartz-enhanced photoacoustic spectroscopy sensor for measurement of water vapor concentration in the air

A compact and highly linear quartz-enhanced photoacoustic spectroscopy（QEPAS） sensor for the measurement of water vapor concentration in the air is demonstrated. A cost-effective quartz tuning fork（QTF） is used as the sharp transducer to convert light energy into an electrical signal based on the pi...

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Bibliographic Details
Published inChinese physics B Vol. 24; no. 1; pp. 282 - 286
Main Author 龚萍 谢亮 漆晓琼 王瑞 王辉 常明超 杨慧霞 孙菲 李冠鹏
Format Journal Article
LanguageEnglish
Published 2015
Subjects
Barometric pressure
Modulation
Photoacoustic spectroscopy
Piezoelectricity
Sensors
Transducers
Tuning
Water vapor
光声光谱法
光检测器
光谱传感器
水蒸汽
测量
浓度
石英音叉
空气
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ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/24/1/014206

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Summary:A compact and highly linear quartz-enhanced photoacoustic spectroscopy（QEPAS） sensor for the measurement of water vapor concentration in the air is demonstrated. A cost-effective quartz tuning fork（QTF） is used as the sharp transducer to convert light energy into an electrical signal based on the piezoelectric effect, thereby removing the need for a photodetector. The short optical path featured by the proposed sensing system leads to a decreased size. Furthermore, a pair of microresonators is applied in the absorbance detection module（ADM） for QTF signal enhancement. Compared with the system without microresonators, the detected QTF signal is increased to approximately 7-fold. Using this optimized QEPAS sensor with the proper modulation frequency and depth, we measure the water vapor concentration in the air at atmospheric pressure and room temperature. The experimental result shows that the sensor has a high sensitivity of 1.058parts-per-million.
Bibliography:Gong Ping,Xie Liang,Qi Xiao-Qiong,Wang Rui,Wang Hui,Chang Ming-Chao,Yang Hui-Xia,Sun Fei,Li Guan-Peng（State Key Laboratory on Integrated Optoelectronics,Institute of Semiconductors,Chinese Academy of Sciences, Beijing 100083, China）
distributed feedback laser diode; photoacoustic spectroscopy; wavelength modulation; second harmonic detection
A compact and highly linear quartz-enhanced photoacoustic spectroscopy（QEPAS） sensor for the measurement of water vapor concentration in the air is demonstrated. A cost-effective quartz tuning fork（QTF） is used as the sharp transducer to convert light energy into an electrical signal based on the piezoelectric effect, thereby removing the need for a photodetector. The short optical path featured by the proposed sensing system leads to a decreased size. Furthermore, a pair of microresonators is applied in the absorbance detection module（ADM） for QTF signal enhancement. Compared with the system without microresonators, the detected QTF signal is increased to approximately 7-fold. Using this optimized QEPAS sensor with the proper modulation frequency and depth, we measure the water vapor concentration in the air at atmospheric pressure and room temperature. The experimental result shows that the sensor has a high sensitivity of 1.058parts-per-million.
11-5639/O4
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SourceType-Scholarly Journals-1
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ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/1/014206