Quantifying Emissions When Leak Origin is Obscured

Here are some examples of spooky shadows of equipment where, if we have a diluted plume tail like these, we sometimes don’t even need context imagery (visible camera images or lidar intensity images as below) to know what solid objects are between our camera and the gas plume. These examples also show that it’s not necessary to directly image the origin of a plume to quantify the emission rate of a source -- we can measure the plume’s gas volume at any point in the plume and use wind information to compute the flow rate of the gas across our field of view. Here, from the recent campaign at METEC, this emission source had a metered flow rate of 6.4kg/h and QLM measured it quite accurately at 6.8kg/h.