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Proceedings Paper

Development of laser sensing device both NH3 at 1.53µm and NO2 at 3.46µm at the same instant using laser absorption spectrometry
Author(s): Kouichi Wake; Takuro Ono; Satoru Tanoue; Nobuyoshi Ohtani; Shigeru Yamaguchi; Masamori Endo; Kenzo Nanri; Takakazu Morita; Tomoo Fujioka
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Paper Abstract

This paper reports on a trace gas monitor using a dual wavelength coherent light source. The laser spectrometer is based on difference frequency generation (DFG) techniques in a periodically poled lithium niobate (PPLN) crystal, naturally having two laser sources (i.e., signal and pump laser sources) in it. A newly proposed idea is to use residual signal DFB-LD power to tune to NH3 absorption lines around at 1.536 μm when the DFG output wavelengths are accessed at 3.46 μm. In the experiments, the signal DFB-LD was carefully tune the wavelength guided by HITRAN database in order to select appropriate mid-IR absorption lines of NO2, while the DFB-LD can detect simultaneously NH3 absorption lines. As results, both gaseous species were detected successfully with the same multi-pass optical cell in one DFG spectrometer scheme. Spectroscopic data both in near-IR and in mid-IR region, simulating flue gas condition are discussed in detail.

Paper Details

Date Published: 23 March 2005
PDF: 10 pages
Proc. SPIE 5710, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IV, (23 March 2005); doi: 10.1117/12.590282
Show Author Affiliations
Kouichi Wake, Tokai Univ. (Japan)
Takuro Ono, Tokai Univ. (Japan)
Satoru Tanoue, Tokai Univ. (Japan)
Nobuyoshi Ohtani, Tokai Univ. (Japan)
Shigeru Yamaguchi, Tokai Univ. (Japan)
Masamori Endo, Tokai Univ. (Japan)
Kenzo Nanri, Tokai Univ. (Japan)
Takakazu Morita, Tokai Univ. (Japan)
Tomoo Fujioka, Tokai Univ. (Japan)

Published in SPIE Proceedings Vol. 5710:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IV
Peter E. Powers, Editor(s)

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