Take the 2-minute tour ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free, no registration required.

As far as I can tell within an Fourier Transform Spectrometer the spectral information is gained from changing the path length along one arm, this sounds very similar to a michelson interferometer but using two apertures instead of one.

So are there any underlying differences between the two?

share|improve this question

1 Answer 1

up vote 1 down vote accepted

You are right, fourier transform spectrometer is just a scanning Michelson interferometer. In spectroscopic applications these are just synonims. Spectral information is a fourier transform of intensity dependence on path length, thus the name. Usually a term wavemeter is used, meaning some interferometric device to measure wavelength, including FTS as well as Fabry–Pérot interferometers.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.