Abstract
This chapter focuses on Fourier spectrophotometry. An interferogram characterizes the incident spectrum that produces it, and can be analyzed to yield the unique spectral distribution of the radiation reaching the detector. The multiplex gain of Fourier spectroscopy is real with results obtained using conventional spectroscopic techniques. The interferogram yields a unique spectrum, whereas a visibility curve can only be analyzed to give a unique spectral distribution when the latter is known, a priori, to be symmetrical about a center frequency. Multiplex in telecommunication is a technique for simultaneously transmitting many messages over the same line. Amplitude division, wave-front division, and polarization interferometers of various configurations are used for multiplexing. Fourier transformation is usually accomplished after the observed data is been pre-processed such as by apodization, and pre-filtering. Existing analog devices for analysis of interferograms and synthesis of spectra are also described in the chapter.
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