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

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.

Near-Infrared Imaging of Water in a Polymer Electrolyte Membrane during a Fuel Cell Operation

“…Therefore, NIR spectroscopy has widely been applied to nondestructive analyses for agricultural and industrial products as well as laboratory use . Spectroscopic imaging based on NIR absorption has also been progressed recently. , …”