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CV layout -> switching y current axis to "current / area" #247

@herrdivad

Description

@herrdivad

Background

Typical, CV spectra will be measured by the device as Potential in voltage as x and current ($$\vec{I}$$) in A/mA as y-values.
But because the current is depend on the surface area ($A$) of the used electrode, these measured values are not comparable across different setups.
Therefore it is required to report the y-values as "current per area aka current density ($$\vec{j}$$)" in "mA/cm".

Trouble using other tools

Calculation cannot be done by external tools like ChemConverter, because not all devices will deliver this value as unmodifiable Metadata and only as free-text-field not required to be filled out and often contains default values.

Possible solutions

ChemSpectra must be able to get the value from the Generic Metadata Set (after user input or correction) and change the axis of the CV spectrum only on user request.

Image -> unit is currently given as mm² but will be chooseable by the user in later versions -> Image

If this value (together with the unit) is extracted and given to ChemSpectra, it could calculate the current density as

$$\vec{j}=\frac{\vec{I}}{A}$$

and allow the user to switch the values of the y-axis in the frontend per button or switch request.
To avoid mistakes, the value of the area must be written next to the button.

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