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Two-Dimensional Imaging of Water Vapor by Near-Infrared Laser Absorption Spectroscopy

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Abstract:

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.

Keywords: FLOW VISUALIZATION; NEAR-INFRARED DIODE LASER; NEAR-INFRARED LASER ABSORPTION SPECTROSCOPY; NEAR-INFRARED VIDICON CAMERA; NIR SPECTROSCOPY; TWO-DIMENSIONAL IMAGING SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370208786401680

Affiliations: Division of Energy Science, EcoTopia Science Institute, Nagoya University, Nagoya 464-8603, Japan

Publication date: November 1, 2008

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