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 …
Author Archives: Marcus
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 …
TiddlyWiki – incoming Links
There are situations when you need to have a list of all the tiddlers that link to some other tiddlers in your TiddlyWiki, e.g. when renaming that other tiddler and having to update all the references to it. Some plugins out there give such lists, like the excellent RelatedTiddlersPlugin by Eric Shulman, whose functionality far …
Classified
You may or may not have noticed a password-protected post appear on this blog and wondered what the meaning of this could be. These posts touch, possibly, topics that are related to my current work at Polytec and may thus contain trade secrets…
Protected: Basics of Laser Doppler Vibrometry
There is no excerpt because this is a protected post.
O’ahu, Hawai’i
Final stop: O’ahu. Waikiki is just a tourist trap, but fortunately O’ahu has more to offer than crowded beaches, shops and Asian food. Here’s proof:
Maui, Hawai’i
After a week on the Big Island, we headed over to Maui. Here are some panoramic highlights…
my favorite focal lengths
I have been meaning to something like this for quite a while, plotting the distribution of the focal lengths used in the pictures I shoot, to see which portions of the zoom range get the most action. Here is the graph for our recent vacation on Hawai’i, obtained using the Lightroom 4 beta and Jeffrey …
Signal Statistics for Nyquist WDM / OTDM
A while back I posted an article on Signal Statistics for OFDM. Originally, this would have included OTDM also, but it grew too long. So it was split into two parts. This is the second part. Please read the original article first, as it explains much of the terminology and the present article by itself …
Big Island, Hawai’i
I am still catching up to getting some order into the pictures I took during our last vacation on Hawai’i. And that was back in September! Anyway, here are some of the better panoramas from our first stop, Big Island. Click through for the large version at flickr, with a short description.