Ja. Silver et Dc. Hovde, A COMPARISON OF NEAR-INFRARED DIODE-LASER TECHNIQUES FOR AIRBORNE HYGROMETRY, Journal of atmospheric and oceanic technology, 15(1), 1998, pp. 29-35
High-frequency wavelength modulation spectroscopy and dual beam absorp
tion noise canceler methods are compared for near-infrared laser detec
tion of moisture at levels relevant to airborne hygrometry. Both techn
iques exhibit sensitivities exceeding -85 degrees C frost point, with
subsecond time response. The application of these techniques to airbor
ne hygrometric instrumentation is discussed.