Development of an Open-Path, Laser Dispersion Spectroscopy (LDS) for Methane Emissions Monitoring
If you're looking for professional advice on methane analysis by means of an open-path laser-absorption spectrometer, follow the link for the relevant e-Learning. Similarly, if you're in need of information on hyperspectral infra-red imaging for any-state methane, take a look at Jean-Phillipe Gagnon of Telops Inc.'s lecture on the topic. Finally, click through to find an overview of new sensor technologies for methane analysis.
Laser Dispersion Spectroscopy (LDS), is a new gas sensing technique that applies a novel approach to tuneable diode laser spectroscopy. Established laser absorption techniques depend on measuring detected intensity to derive concentration. This significantly impacts measurements in "dirty" environments where detected intensity of the transmitted light is bound to fluctuate. MIRICO's LDS-based instrument derives concentration using the phase of light. This makes it highly immune to intensity fluctuations received at the photodetector. The instrument enables precise, real time measurements of trace gas molecules in demanding environments. Furthermore, compared to absorption techniques, the analyser can measure gas concentrations within a very wide dynamic range (typically about five to six orders of magnitude), meaning for example from parts per billion all the way to sub-percent concentrations without the requirement for dilution.
In a long open-path, multi-direction configuration, coupled with a retroreflector array, and anemometer, the LDS analyser is capable of measuring methane concentrations associated with large area sources, and locating and quantifying point source emissions within said area. Here we describe the principle of LDS, and the development of a field-deployable instrument. In addition, we introduce the basic configuration required for mapping applications.
For further techological developments in laser-dispersion spectroscopy, check out an e-Learning that investigates a mid-infrared variation of the technique.
Free to watch
Sessions are free to watch. Please login to view this session or create an account.
Dr Damien Weidmann (MIRICO Ltd.)
In This Edition Fuel for Thought - Tanaka’s achievements acknowledged by Japan’s Ministry of Economy, Trade and Industry - ION Science appoints four directors for strategic evolution and...
View all digital editions
Sep 26 2022 Rio de Janeiro, Brazil
Sep 27 2022 Toronto, Canada
Sep 27 2022 Kuala Lumpur, Malaysia
Sep 27 2022 Calgary, Canada
Sep 28 2022 Almaty, Kazakhstan