Both a flow of water vapor generated from a humidification device and stable water vapor at constant moisture were successfully visualized by near-infrared (NIR) laser absorption spectroscopy. Two different types of optical arrangement for two-dimensional (2D) imaging, i.e., one-wavelength
reflection and two-wavelength transmission, were tested. A flow of water vapor within a wide view range was clearly visualized by the former, while low content of stable water vapor was quantitatively detected by the latter. It was demonstrated that a detection limit of 0.8 g·m−3
was achieved by means of the 2D-NIR imaging system developed in the present study.
Division of Energy Science, EcoTopia Science Institute, Nagoya University, Nagoya 464-8603, Japan
Publication date: November 1, 2008
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