Optical setup of FTS based on the improved beam-folding technique.
Equivalence of optical paths in FTS based on the improved beam-folding interferometer. [(a) and (b)] The optical paths show that the retroreflector reflects the incident beam of light through exactly ; (c) equivalence of the optical path length that the beam goes back and forth with plane perpendicular to the propagation direction of the beam in (b); (d) the virtual equivalent optical model used to describe the optical paths of movable arms of both interferometers in the FTS.
Test spectra detected by the FTS based on the improved beam-folding technique. The scan distance is 20.74 mm; the light sources are (a) He–Ne laser, (b) YAG laser, and (c) diode violet laser. The value in the bracket in (a) indicates the calculated spectral resolution at the He–Ne laser wavelength.
Spectrum of mercury (Hg) lamp with a scan length of 20.74 mm. The values in the brackets indicate the specification values of the spectral line wavenumbers.
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