Category Archives: vibrometry

FM and PM Modulation Spectrum (interactive)

This little widget will calculate the spectrum for various modulation signals with arbitrary frequency and amplitude and explain why it looks the way it does.

the Doppler effect (relativistic)

Christian Doppler in 1942 predicted the Doppler effect for all kinds of waves, not only sound waves. The Doppler effect for light was demonstrated in 1948 by Fizeau. In conjunction with the article on the classical Doppler effect, as it occurs e.g. for sound waves, we will here examine the relativistic Doppler effect which is […]

the Doppler effect (classical)

The Doppler effect is nothing really new. It’s well-known that Doppler frequency shift occurs for sound as well as light; there are, however, some subtle differences between the two, owing mainly to Einstein’s special theory of relativity. This article describes the classical Doppler effect as it occurs e.g. for sound waves and in which the […]

Basics of Doppler Vibrometry

This post has been overdue for quite a while now. I originally intended to post something about what I do at work soon after I started my new job. That was more than a year ago; time really does fly. Somehow there was always something else already in the pipeline and I never got around […]