Mirror scans

Commercial Fourier transform spectrometers operating at moderate resolution (1cm-1) require fractions of seconds to complete a scan of the interferometric mirror (scans may only take tens of milliseconds if only low spectral resolution is required). A new strategy must now be used to study the... 

There are of course other causes for exit beam misalignment other than simply the process of optical retardation by mirror scanning. The overall alignment integrity of the cube-corner/beamsplitter/cube-corner module as well as its optical relationship to the collimated input beam from the NIR source, and the collinear HeNe laser are all critical. The thermal and mechanical instability of this whole assembly is roughly a function of its volume. Small compact FTIR modulators will perform better in process analytical... 

Figure 1.3 Modes of the mirror scanning in interferometry (a) continuous-scan mode and (b) step-scan mode.

Description A UV laser, typically a solid state Nd-YAG laser, is deflected by a mirror scanning system according to the geometry of the CAD file (Fig. 3). Where the laser beam hits the resin surface, polymerization starts and solidifies the liquid resin. The building platform is lowered in z-direction for a new layer to form. Since the liquid resin is not capable of stabilizing geometries, the generation of support structures is necessary (Bartolo 2011). 

After appropriate amplification of 4), these interferograms are digitized in alternating blocks of mirror scans and then Fourier transformed to yield the two spectra, 4(v) and 4)(v), respectively, as... 

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