|Smoke and Mirrors: Ultra-Rapid-Scan FT-IR
Conventional FT-IR instruments invariably use a voice coil drive to scan
one or both mirrors of a Michelson interferometer, or one of the many variations on
Michelsons design. The scanning produces a profoundly accurate modulation of the
incident radiation. The modulation can be decoded by Fourier transformation to recover a
spectrum of the incident radiation. The reason that the mirror velocities are sharply
limited is a result of the combination of mirror mass and the maximum linear motor force.