Discussion
What replaced the monochromator in a Fourier transform instrument?
Answer: A
A Michelson interferometer modulates every wavelength at its own frequency as the mirror travels, and the transform recovers the spectrum from the resulting interferogram. Arrays, filters and tunable lasers are other approaches used elsewhere. Replacing a device that selects one wavelength at a time with one that encodes them all simultaneously is the change that transformed infrared practice, and both of its advantages follow from it. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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