The Development of Ammonia Sensor Based on Tunable Diode Laser Absorption Spectroscopy with Hollow Waveguide

被引：3
|
作者：
Du Zhen-hui [1 ]
Zhang Zhe-yuan [1 ]
Li Jin-yi [1 ]
Xiong Bo [1 ]
Zhen Wei-meng [1 ]
机构：
[1] Tianjin Univ, State Key Lab Precis Measuring Technol & Instrume, Tianjin 300072, Peoples R China
来源：
SPECTROSCOPY AND SPECTRAL ANALYSIS | 2016年 / 36卷 / 08期
关键词：
Laser gas sensor; Hollow waveguide; Tunable diode laser absorption spectroscopy (TDLAS); Ammonia; Wavelength modulation spectroscopy(WMS); Calibration free; WAVELENGTH-MODULATION SPECTROSCOPY; GAS; ENVIRONMENTS; TDLAS;
D O I：
10.3964/j.issn.1000-0593(2016)08-2669-05
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
Hollow waveguides (HWG) have recently emerged as a novel concept serving as an efficient optical waveguide and a highly miniaturized gas cell. Compared with conventional multi-pass gas cells, HWG gas cell has the advantages of facilitating gas exchanging because of its small size and fast responding speed. In this paper, we poposed an ammonia sensor based on tunable diode laser absorption spectroscopy(TDLAS) using HWG as the gas cell. The sensor employs wavelength modulation spectrum(WMS) with simultaneous detection of the second harmonic(2f) signal and the first hamonic(1f) signal. Normalization of the 2f signal by the 1f signal enables the sensor for calibration free measurement. The sensor performance is tested with gas standards and the result shows good linearity with correlation coefficient of 0. 999 8, and the detection limit is 26 ppb with an integration time of 18 s. The sensor based on HWG gas cell is suitable for sensative and real-time monitoring ammonia in the air.
引用
收藏
页码：2669 / 2673
页数：5
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