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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 62,
  • Issue 11,
  • pp. 1216-1220
  • (2008)

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<sup>−3</sup> was achieved by means of the 2D-NIR imaging system developed in the present study.

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