Sensitive Detection of Ammonia Based on Quartz-Enhanced Photoacoustic Spectroscopy

被引：4
|
作者：
Dang, Hongtao [1 ]
Ma, Yufei [1 ,2 ]
Liu, Fuhua [1 ]
Lu, Jie [3 ]
机构：
[1] Xijing Univ, Shanxi Engn Res Ctr Controllable Neutron Sources, Sch Sci, Xian 710123, Shaanxi, Peoples R China
[2] Harbin Inst Technol, Natl Key Lab Sci & Technol Tunable Laser, Harbin 150001, Heilongjiang, Peoples R China
[3] Xian Guanneng Neutron Detect Technol Co Ltd, Xian 710123, Shaanxi, Peoples R China
来源：
JOURNAL OF RUSSIAN LASER RESEARCH | 2019年 / 40卷 / 03期
关键词：
quartz-enhanced photoacoustic spectroscopy; quartz tuning fork; microresonator; ammonia; QUANTUM CASCADE LASER; PPB-LEVEL DETECTION; COMPACT; SENSOR; NITROGEN;
D O I：
10.1007/s10946-019-09800-9
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
This letter describes a sensitive quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor for measuring ammonia (NH3) concentrations based on a custom quartz tuning fork (QTF) with a small gap of 200 mu m. The signal was enhanced by adding a microresonator (mR) with an optimum length of 5 mm to the bare QTF. Wavelength modulation spectroscopy with second-harmonic detection was adopted to reduce the noise level and simplify the data processing. After optimization of the laser modulation depth, a minimum detection limit of 22.6 ppm was obtained.
引用
收藏
页码：265 / 268
页数：4
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