光谱学与光谱分析 |
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The Development of Ammonia Sensor Based on Tunable Diode Laser Absorption Spectroscopy with Hollow Waveguide |
DU Zhen-hui, ZHANG Zhe-yuan, LI Jin-yi, XIONG Bo, ZHEN Wei-meng |
State Key Lab of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China |
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Abstract 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.
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Received: 2015-06-02
Accepted: 2015-10-20
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Corresponding Authors:
DU Zhen-hui
E-mail: duzhenhui@tju.edu.cn
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