A quartz-enhanced photoacoustic spectroscopy sensor for measurement of water vapor concentration in the air
A quartz-enhanced photoacoustic spectroscopy sensor for measurement of water vapor concentration in the air
复制标题
一种用于测量空气中水蒸气浓度的石英增强光声光谱传感器
DOI：
10.1088/1674-1056/24/1/014206
复制
发表时间：
2015-01-01
影响因子：
1.7
通讯作者：
Li Guan-Peng
中科院分区：
文献类型：
--
作者：
Gong Ping;Xie Liang;Li Guan-Peng
介绍了一种用于测量空气中水汽浓度的石英增强光声光谱（QEPAS）传感器。一个具有成本效益的石英音叉（QTF）被用作尖锐的换能器转换成基于压电效应的电信号的光能，从而消除了对光电探测器的需要。所提出的传感系统的短光程特征导致减小的尺寸。此外，在吸光度检测模块（ADM）中应用了一对微谐振器来增强QTF信号。与没有微谐振器的系统相比，检测到的QTF信号增加到约7倍。利用优化后的QEPAS传感器，在适当的调制频率和调制深度下，我们测量了大气压和室温下空气中的水蒸气浓度。实验结果表明，该传感器具有1.058ppm的高灵敏度。
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.