NASA NTRS · 19850000321
Methane Detector With Plastic Fresnel Lens
Abstract
Laser detector for natural gas leaks modified by substitution of molded plastic lens for spherical mirror. By measuring relative attenuation at two wavelengths, detector used to check for methane escaping from pipelines above or below ground and from landfill.
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Grant, W. B.. 1986-01-01. Methane Detector With Plastic Fresnel Lens. https://ntrs.nasa.gov/citations/19850000321
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