›› 2015, Vol. 24 ›› Issue (1): 14206-014206.doi: 10.1088/1674-1056/24/1/014206
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
龚萍, 谢亮, 漆晓琼, 王瑞, 王辉, 常明超, 杨慧霞, 孙菲, 李冠鹏
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)
摘要: 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.
中图分类号: (Laser optical systems: design and operation)