Frequency extraction for pixel , for different number of frames (Hyperspectral data) in spectroscopy

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I have to find absorbtion profile of sample gas in spectroscopy experiment. I have recieved multiple images at 40 frames/sec and total number is 400 frames which is actually a hyperspectral data. Now I have to extract frequency information from a specific pixel for multiple frames so that to know the pixel intensity response for different frequencies. How can I get Amp vs Freq plot? whenevr I plot FFT I get Amp vs number of frames instead. Current plot is attached.
Any one can help!

Answers (1)

Tarunbir Gambhir
Tarunbir Gambhir on 27 Jan 2021
For plotting the FFT of the signal with a correct frequency axis, you need to incorporate the sampling rate into the frequency domain while plotting the graph. I suggest you refer the example for plotting 'Single-Sided Amplitude Spectrum of X(t)' here.

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