Abstract: A system for measuring a gas plume includes a vehicle affixed or attached with a mast comprising a plurality of perforated inlet tubes configured to measure or detect real-time height-resolved sampling of a gas of interest, such as methane, over the height of the mast, and/or a plurality of gas analyzers, wherein the analyzers are configured to provide a continuous readout of the gas of interest from each height interval using the plurality of gas analyzers from each height interval.

Abstract: A gas concentration image (i.e., concentration vs. position data) in a cross section through a gas plume is obtained. Such measurements can be obtained by moving a 1D array of gas sample inlets through the gas plume. By combining a gas concentration image with ambient flow information through the surface of the gas concentration image, the leak rate (i.e., gas flux) from the leak source can be estimated. Multiple gas analysis instruments can be employed in connection with sweeping a 1-D array of measurement ports through the gas plume in order to reduce analysis time.