This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Fourier Transform spectrometer principle.svg en Schematic drawing of an Fourier transform spectrometer based on Michelson interferometer The frequency spectrum resembles the frequencies contained in the interferogram The frequency spectrum is obtained by fast Fourier transformation FFT of the interferogram own Joachim Terschluesen