Ppb-level detection of ammonia based on QEPAS using a power amplified laser and a low resonance frequency quartz tuning fork

被引：59
作者：
Ma, Yufei [1 ]
He, Ying [1 ]
Tong, Yao [1 ]
Yu, Xin [1 ]
Tittel, Frank K. [2 ]
机构：
[1] Harbin Inst Technol, Natl Key Lab Sci & Technol Tunable Laser, Harbin 150001, Heilongjiang, Peoples R China
[2] Rice Univ, Dept Elect & Comp Engn, 6100 Main St, Houston, TX 77005 USA
来源：
OPTICS EXPRESS | 2017年 / 25卷 / 23期
基金：
中国国家自然科学基金; 黑龙江省自然科学基金; 中国博士后科学基金; 美国国家科学基金会;
关键词：
QUANTUM CASCADE LASER; ENHANCED PHOTOACOUSTIC-SPECTROSCOPY; OPTICAL-FIBER AMPLIFIER; WAVELENGTH MODULATION; SENSOR; DIODE; NITROGEN; SYSTEM;
D O I：
10.1364/OE.25.029356
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this report, an ultra-high sensitive quartz-enhanced photoacoustic spectroscopy (QEPAS) based ammonia (NH3) sensor using a power amplified diode laser and a low resonance frequency quartz tuning fork (QTF) was demonstrated for the first time. A fiber-coupled, continuous wave (CW), distributed feedback (DFB) diode laser with a watt level output power boosted by an erbium-doped fiber amplifier (EDFA) was used as the QEPAS excitation source. A QTF with a resonance frequency of 30.72 kHz was employed as an acoustic wave transducer. The modulation depth in the wavelength modulation spectroscopy (WMS) based QEPAS system was optimized theoretically and validated by experimental measurements. For the reported NH3 sensor system, a 418.4 ppbv (parts per billion by volume) minimum detection limit at a NH3 absorption line of 6533.4 cm(-1) was achieved when the modulation depth was set to the optimum value of 0.188 cm(-1). The ppb-level detection sensitivity verified the design of the reported QEPAS method and makes it suitable for use in environmental monitoring and other applications. (C) 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
引用
收藏
页码：29356 / 29364
页数：9
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