Fourier transform spectroscopy (FTS) has become an indispensable tool for the quantification and monitoring of atmospheric constituents. By measuring the interference pattern—known as an interferogram ...

The representation of a PERIODIC sound or WAVEFORM as a sum of Fourier components (i.e. pure SINUSOIDAL WAVEs). According to the FOURIER THEOREM, periodic sound may be shown to consist of SINE WAVEs ...