 Fourier-transform spectroscopy

Fourier transform spectroscopy measures an interferogram as a function of optical path length difference. Its Fourier transform recovers the spectrum. An imaging implementation obtains an interferogram at every detector pixel, but a scanned cube is not simultaneous at all wavelengths.

Fourier-transform spectroscopy (FTS) is an analytical technique used to obtain the spectrum of a substance by measuring the intensity of light as a function of wavelength or frequency. The core principle of FTS is the application of Fourier transform mathematics to process the data collected from spectroscopic measurements. Here’s how it works in a nutshell: 1. **Interferometry**: FTS typically employs an interferometer, such as a Michelson interferometer, to split an incoming light beam into two paths.