IEEE Spectrum (May 29, 2017): Differential Lidar Catches "Fugitive" Methane on the Fly

IEEE Spectrum (May 29, 2017): Differential Lidar Catches "Fugitive" Methane on the Fly

"...(Their) Methane Monitor is a differential-absorption lidar (DIAL) methane detection system that uses two lasers of slightly different infrared wavelengths to map the ground and measure atmospheric methane. Methane strongly absorbs one of the wavelengths (at about 1,645.55 nm, the “on-resonance beam”) and is virtually transparent to the other—at about 1645.4 nm, the “off-resonance beam”)." IEEE Spectrum feed

       Physics.org (June 26, 2013): Developing a new laser to detect methane leaks