Southwest Sciences Inc. (SWS)

Vertical Cavity Surface-Emitting Laser (VCSEL) Hygrometer

The VCSEL hygrometer employs tunable diode laser absorption spectroscopy to determine the water vapor number density over a dew-point range of -90 to +30ยบ C. It reports the water vapor number density at 25 samples per second. From the number density other humidity-related parameters such as dew/frost point, mixing ratio, etc. are derived. It is mounted on a GV aperture plate, weighs 3.2 kg and draws less than 20W from 120 VAC, 60 Hz.

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