Linear extraction

Abstract

The "Linear extraction" post run processing tool is very convenient to reduce the file size by reducing the number of experimental points without loosing any information.
Although it is possible to decide to minimise the size file by taking one point out of ten for instance, one can easily imagine that peak information may be lost.
With the "Linear extraction" intelligent filter, you can control in four dimensions (time, potential, current and coulombs) the filtering process.
Whenever your experiment generates a file above 10 thousand of points you will benefit from the "Linear extraction" filtering them down to a reasonable few hundreds points file.

Example:

Select one large curve such here this 3599 points cyclic voltammetry

Select [Processing\Linear extraction]

You will come to this dialogue box where you can for instance select 20 µA and 20 mV as the criterions for filtering the data. To get access to this filtering level, deselect the "sampling rate".

Then validate your choice

To save this filtered file, press on the little "diskette" icon and give it the name you want to. Once you have saved it you can overlay the filtered data on the original curve to check that everything is OK.

This intelligent filter extracts a point if the variations in i, E, t and/or Q between this point and the previous extracted point are higher than a pre-defined criterion. Increasing the filter criterion decreases the number of points of the curve extract.

The "extract" function is useful to minimise the size of your archive files and also to select part of the curve. The "Auto Linear extraction" tool can automate this filtering action within your sequence just after the acquisition of the experimental curve.