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How to normalize an absorption spectrum

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Roberta Piacentini
Roberta Piacentini il 7 Apr 2022
Risposto: Abhimenyu il 27 Set 2023
Hello to everyone, I would like to manipulate an absorption spectrum in order to "highlight" the absorption peaks of my sample. I attach the plot image, at first I thought it was an offset or a background signal, but even with the reference subtraction the signal looks like this so I thought there might be a way to reasonably normalize the curve.
Thank you in advance :)

Risposte (1)

Abhimenyu
Abhimenyu il 27 Set 2023
Hi Roberta,
I understand that you want to normalise the absorption curve for highlighting the peaks. These are some possible steps you can take:
  1. findpeaks": This function will help to find the peaks and highlight them using a pointer.
  2. Normalise with max”/“findpeaks”: You can use max” function or findpeaks” function to find the maximum data point. You can divide your entire data by this maximum value to normalise the graph and enhance the peaks.
  3. “smoothdata”: This function can help to filter out noise using various filters and help you enhance the peaks.
You can refer to the following links from MATLAB documentation to understand more about "findpeaks" and "smoothdata" functions respectively.
  1. https://www.mathworks.com/help/releases/R2023a/signal/ref/findpeaks.html
  2. https://www.mathworks.com/help/releases/R2023a/matlab/ref/smoothdata.html
I hope this helps!
Thank you,
Abhimenyu

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