Abstract
Considering that the stand-off detection of ethanol gas is significant for monitoring ethanol-free occasions, we propose and experimentally demonstrate a 1.7 μm/1.5 μm near-infrared spectroscopy system. Then based on the generated laser signals and the system, the ethanol gas and ethanol solution was stand-off detected and researched. Firstly, we measured the absorption characteristics of ethanol solution in the near-infrared band for wavelength selection. Secondly, the Tm-doped fiber laser in the system was achieved based on a ring cavity and a customized FBG; its output laser wavelength was 1728.45 nm. The linewidth of the 1.7 μm band signal was about 0.18 nm and the side mode suppression ratio (SMSR) was about 57 dB. Thirdly, ethanol gas and ethanol solution were stand-offs detected using the established 1.7 μm/1.5 μm near-infrared spectroscopy system. The concentration of ethanol solution was measured by 1.7 μm band laser, and the R-Square of the linear fit was 0.98. However, the concentration of ethanol gas in a turbulence state cannot be easily measured due to scintillation. Therefore, we detected the ethanol gas a turbulence state using a 1.7 μm/1.5 μm dual-band system, R-Square of the linear fit was 0.83 when the power jitter variance was 2.35. the experimental results offer a technical reference for stand-off detection of ethanol gas.
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