Figure 2: The processes implemented in the endPoint function in a time resolved acquisition of Foram-72-shot-3 as a visualisation of the returned data frame $df. Panel (a) visualises the entire raw 44Ca data collected; panel (b) visualises the background corrected44Ca with the first 35 seconds removed as this was before the laser was turned on and the ablated material is still travelling through the system and this is the data frame passed into the endPoint function; plot (c) visualises the target data retained after running the endPoint function, with both the first 35 seconds and post endPoint detection 44Ca data removed.
Figure 3 shows the manual validation tools to check that the endPoint function had successfully identified when the laser had burnt through the entire depth of the test wall. The black line is a scaled transformation of the smoothed signal specified in signalCol; the blue line is the scaled rate of change in signal over the moving time window and the shaded red areas identify the data points removed from the returned data frame, $df, as these exceed the end point blast through detection time stamp.