Gas leak detection and event selection based on spatial concentration variability and other event properties

摘要

This work provides event selection in the context of gas leak pinpointing using mobile gas concentration and atmospheric measurements. The main idea of the present approach is to use a moving minimum to estimate background gas concentration, as opposed to the conventional use of a moving average for this background estimation.

主权项

1. A method for gas leak event detection and selection, the method comprising:
providing a series of gas concentration measurements ci indexed by an integer i; detecting peaks pi in the series of gas concentration measurements ci, wherein each peak pi has a corresponding amplitude ai; computing a moving minimum mci given by the minimum of cj, wherein j is an index in a range i−nmin+k1≦j≦i+k1, wherein nmin is a moving minimum window width, and wherein k1≦nmin is a first window offset; computing a moving standard deviation σi of mcj, wherein j is an index in a range i−nb+k2≦j≦i+k2, wherein nb is a moving standard deviation window width, and wherein k2≦nb is a second window offset; performing event selection by computing a ratio Ri of peak amplitude ai at peak pi to the moving standard deviation σi of at peak pi and selecting events that have Ri exceeding a predetermined threshold condition; and providing selected events as an output.