Spatially Encoded Fourier Transform Spectroscopy in the Ultraviolet to Near-Infrared

Abstract

A spatial (Sagnac triangular common path) interferometer is described and evaluated for obtaining spectra in the 200–950 nm wavelength region. The interferometer has no moving parts, requires no entrance or exit slits, and is easy to align. A linear CCD is employed as the detector, allowing spectra to be simultaneously acquired. The performance of the interferometer is demonstrated for atomic emission and solution absorbance spectra. A method to remove the fixed-pattern response of the detector and optical system is demonstrated which effectively increases the dynamic range of the resulting spectra.