1. Methane leak detection by tunable laser spectroscopy and mid-infrared imaging
- Author
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Eric Maier, Armin Lambrecht, Jonas Steinebrunner, Jürgen Wöllenstein, Thomas Strahl, Johannes Herbst, and Publica
- Subjects
absorption spectroscopy ,Tunable diode laser absorption spectroscopy ,Materials science ,Absorption spectroscopy ,business.industry ,Infrared ,tunable lasers ,Interband cascade laser ,Atomic and Molecular Physics, and Optics ,law.invention ,image processing ,Wavelength ,Optics ,law ,HITRAN ,Electrical and Electronic Engineering ,Spectroscopy ,business ,Engineering (miscellaneous) ,Tunable laser - Abstract
Tunable laser spectroscopy (TLS) combined with mid-infrared imaging is a powerful tool for a sensitive and quantitative visualization of gas leaks. This work deals with standoff methane leak detection within 2 m by an interband cascade laser (3270 nm wavelength) and an infrared camera. The concept demonstrates visualization of methane leakage rates down to 2 ml/min by images and sequences at frame rates up to 125 Hz. The gas plume and leak can be localized and quantified within a single image by direct absorption spectroscopy (DAS). The HITRAN database allows a calibration-free, pixelwise determination of the concentration in ppm*m. The active optical imaging concept showed pixelwise sensitivities around 1 ppm*m.
- Published
- 2021