Abstract

A remote methane detection system has been developed using a single-frequency tunable optical parametric oscillator at 3.4μm infrared wavelength. The infrared received light is converted by a frequency upconverter with a strong pump beam to near-infrared wavelength at 0.81μm and detected by a sensitive photomultiplier. The conversion efficiency of the upconverter was 40% for the backscatter signal from a topographic target, and the detector sensitivity was 11 times higher than that of the cooled InAs detector. By raster scanning the infrared beam, imaging was realized for the methane gas plume with an accuracy of 20partsin106m at the range of 2m.

© 2007 Optical Society of America

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