Fourier Transform Infrared, more commonly known as FT-IR, is the preferred method for infrared spectroscopy. Developed in order to overcome the slow scanning limitations encountered with dispersive instruments, with FT-IR the infrared radiation is passed through a sample. The measured signal is referred to as an interferogram. Performing a Fourier transform on this signal data results in a spectrum identical to that from conventional (dispersive) infrared spectroscopy, but results are much faster with results in seconds, rather than minutes.