Compare Data Sources
Often it is informative to plot one set of data on top of another. While light-emitting diodes are created by combining several colors on a single chip. Although your eye sees color in discrete bands, careful selection of the composite colors can appear ‘white’.
Here the spectrum of two TT Electronics Ledium Series light emitting diodes are plotted with the CIE tristimulus curves.
Using Digitized Data in Matlab
Graphs digitized with Dagra can be loaded into Matlab in three ways:
- Dagra’s
LoadDagra.m
function for Matlab. - Copied onto the clipboard and pasted into Matlab’s command line window, or
- Exported into a text file and imported using Matlab’s
dlmread
function.
The easiest method is using the LoadDagra.m
function because you don’t need to create a separate file or fill up Matlab’s command buffer with the imported data.
Pasting Digitized Data into Excel
Energy falling on an Infrared Sensor
Dagra was used in this example to trace the transmittance of a Fresnel lens so the data could be used in MathCad.
The goal of the project was to estimate how much energy from the skin of a person would be focused onto an infrared sensor. The lens had a lot of strong absorption bands in the wavelengths we were interested in so tracing the transmission from the manufacturer’s datasheet helped provide a more accurate model.