A Comparison of Near-Infrared Diode Laser Techniques for Airborne Hygrometry

Joel A. Silver Southwest Sciences, Inc., Santa Fe, New Mexico

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David Christian Hovde Southwest Sciences, Inc., Santa Fe, New Mexico

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Abstract

High-frequency wavelength modulation spectroscopy and dual beam absorption noise canceler methods are compared for near-infrared laser detection of moisture at levels relevant to airborne hygrometry. Both techniques exhibit sensitivities exceeding −85°C frost point, with subsecond time response. The application of these techniques to airborne hygrometric instrumentation is discussed.

Corresponding author address: Joel A. Silver, Southwest Sciences, Inc., 1570 Pacheco Street, Suite E-11, Santa Fe, NM 87505.

Abstract

High-frequency wavelength modulation spectroscopy and dual beam absorption noise canceler methods are compared for near-infrared laser detection of moisture at levels relevant to airborne hygrometry. Both techniques exhibit sensitivities exceeding −85°C frost point, with subsecond time response. The application of these techniques to airborne hygrometric instrumentation is discussed.

Corresponding author address: Joel A. Silver, Southwest Sciences, Inc., 1570 Pacheco Street, Suite E-11, Santa Fe, NM 87505.

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