Vertical Cavity Surface-Emitting Laser (VCSEL) Hygrometer

SouthWest Sciences, Inc (SWS) & UCAR/NCAR-Earth Observing Laboratory
The VCSEL hygrometer employs tunable diode laser absorption spectroscopy to determine the water vapor number density over a dew-point range of -90 to +30º C. It reports the water vapor number density and approximate dew-point at 25 samples per second. It is mounted on a GV aperture plate, weighs 3.2 kg and draws less than 20W from 120 VAC, 60 Hz. The hygrometer operates in two absorption modes on two wavelengths: wavelength modulation on a...
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