Method for improving the performance accuracy in differential absorption lidar for oil and gas pipeline leak detection and quantification

摘要

An improved method for determining whether a measurement point, measured using a differential absorption LIDAR (DIAL) system, represents a plume point or a non-plume point. Concentration path lengths (CPL's) for a plurality of measurement points are determined. An average non-plume CPL, CPL, is provided. For each measurement point, a standard deviation, CPL_sd, is calculated based on first order error propagation and it is determined that the measurement point represents a non-plume point when the Hooshmand decision rule (HDR) is met. The HDR is given by, $$ {\left(\frac{\mathrm{cpl}-\stackrel{\_}{\mathrm{CPL}}}{{\mathrm{CPL}}_{\mathrm{sd}}}\right)}^2{\left(T\right)}^2,$$where cpl is the corresponding CPL of the measurement point being tested and T is a threshold standard deviation level.