Maintained by ppernot
This module enables to fine tune a subset of data to be analyzed, mainly to remove over-noisy area or artefacts (signal rise, Cherenkov…).
Important: you have to visit this tab to activate/enable the the
analysis tabs (SVD, ALS…).
The left panel contains four tabs:
Selection: to select the external limits of the treated area
Baseline: to define the areas used to correct the signal baseline
Wavl Mask: to define masks on the wavelength axis (wavelengths
ranges not to be analyzed)
Delay Mask: to define masks on the delay axis, typically to mask
signal artefacts
and a set of buttons to Reset, Save and Load selections.
Warning: the Save and Load operations are experimental, meaning
unstable. Presently, any difference in the loaded matrices prevents the
reuse of saved selections.
The right panel contains two tabs with graphical representations that show the modifications due to the actions in the left panel:
the Data tab represents the data matrix and averaged cuts along
both axes.
The data matrix is zoomable (click and drag + dble click;
another dble click cancels the zoom).
The cuts position are marked by violet dashed lines and they are
controlled by two sliders (Reference wavl and Reference
delay). Each cuts data can be saved to disk by clicking on the
corresponding Save buttons.
Masks are represented by grayed areas.
the Cuts tab provides the usual stacked lines representation, for
the spectra (left) and kinetic traces (right), where you can choose
the cut frequency Cut freq. for each axis. Both figures are
zoomable and the corresponding data can be saved to disk.
This tab contains three sliders:
OD Range: select the Optical Density range to improve
visualization, notably when there are spikes. This has no impact
on data selection.
Wavelength Range: selects the min and max wavelengths of the
matrix
Delay Range: selects the min and max delays of the matrix
A Baseline mask is used to correct the baseline in a data matrix, by delaywise averaging the masked values to zero.
When several matrices have been delay-tiled, each baseline correction is applied to the data between this mask and the next one (or the end if none is present).
Note: The data covered by the Baseline masks are not excluded from the data analysis.
The initial tab contains two elements:
a Nb of masks input where you can select the desired number of
masks.
a Auto button, which attempts to generate and locate the adequate
number of masks.
For each mask, a slider is created enabling to define its min and max positions. The masks are represented by salmon transparent areas on the matrix and cuts figures.
Tip: Zooming on the data matrix is helpful to define precise limits.
The wavl masks are intended to exclude wavelength-delimited area(s) from data analysis, typically over-noisy areas or laser wavelengths.
The initial tab contains two elements:
a Nb of masks input where you can select the desired number of
masks.
a Auto button, which attempts to generate and locate the adequate
number of masks.
For each mask, a slider is created enabling to define its min and max positions.
The delay masks are intended to exclude delay-delimited area(s) from data analysis, typically baseline areas and artefacts (Cherenkov).
The initial tab contains two elements:
a Nb of masks input where you can select the desired number of
masks.
a Auto button, which attempts to generate and locate the adequate
number of masks.
For each mask, a slider is created enabling to define its min and max positions.