A 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, O OSTYLE="SINGLE"CPL, is provided. For each measurement point, a standard deviation, CPLSUBsd/SUB, 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, maths id="MATH-US-00001" num="00001" MATH OVERFLOW="SCROLL" MROW MROW MSUP MROW MO(/MO MFRAC MROW MIcpl/MI MO-/MO MOVER MICPL/MI MI_/MI /MOVER /MROW MSUB MICPL/MI MIsd/MI /MSUB /MFRAC MO)/MO /MROW MN2/MN /MSUP MO/MO MSUP MROW MO(/MO MIT/MI MO)/MO /MROW MN2/MN /MSUP /MROW MO,/MO /MROW /MATH /MATHS where cpl is the corresponding CPL of the measurement point being tested and T is a threshold standard deviation level.