ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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A quartz-enhanced photoacoustic spectroscopy sensor for measurement of water vapor concentration in the air |
Gong Ping (龚萍), Xie Liang (谢亮), Qi Xiao-Qiong (漆晓琼), Wang Rui (王瑞), Wang Hui (王辉), Chang Ming-Chao (常明超), Yang Hui-Xia (杨慧霞), Sun Fei (孙菲), Li Guan-Peng (李冠鹏) |
State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China |
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Abstract 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 1.058 parts-per-million.
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Received: 12 May 2014
Revised: 07 August 2014
Accepted manuscript online:
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PACS:
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42.60.-v
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(Laser optical systems: design and operation)
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78.20.Pa
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(Photoacoustic effects)
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42.60.Fc
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(Modulation, tuning, and mode locking)
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02.30.Px
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(Abstract harmonic analysis)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61107070, 61127018, and 61377071). |
Corresponding Authors:
Xie Liang
E-mail: xiel@semi.ac.cn
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Cite this article:
Gong Ping (龚萍), Xie Liang (谢亮), Qi Xiao-Qiong (漆晓琼), Wang Rui (王瑞), Wang Hui (王辉), Chang Ming-Chao (常明超), Yang Hui-Xia (杨慧霞), Sun Fei (孙菲), Li Guan-Peng (李冠鹏) A quartz-enhanced photoacoustic spectroscopy sensor for measurement of water vapor concentration in the air 2015 Chin. Phys. B 24 014206
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