Fourier transform spectrometer


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Fourier transform spectrometer

(FTS) A type of interferometer that is used to study the constituent frequencies of a beam of radiation and can work in many wavelength regimes. A parallel beam of radiation is split into two coherent beams, which are then recombined so that they undergo interference. The distance traveled by one beam can be changed at a uniform rate. Any difference in distance traveled produces a phase difference between the two recombining beams. Different phase differences occur for the different frequencies present in the beams. If the recombined beams are focused onto a detector and the signal displayed as a function of time, the signal increases and decreases in a complex oscillatory fashion. The signal, digitized at regular intervals, is fed into a computer, where it can be processed by means of a Fourier transform to reveal the amplitudes of all the frequencies present in the spectrum of the input radiation, i.e. the power spectrum of the source.
References in periodicals archive ?
An etalon of the material is illuminated with synchrotron radiation, and the interference fringes in the transmittance spectrum are measured using a Fourier transform spectrometer.
Known as the Remote Monitoring Fourier Transform Spectrometer (FTS), the device employs advanced spectral processing techniques to detect and identify otherwise imperciptible trace of gases and vapors released into the atmosphere during drug and chemical production, chemical warfare, and industrial manufacturing.
Prior to joining NASA, Gazarik served as project manager for the Geosynchronous Imaging Fourier Transform Spectrometer project at the Massachusetts Institute of Technology's Lincoln Laboratory.

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