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.
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