Visit the Projects Page

Also see techlib.com for my stuff dating back to the start of the Internet to the present - techlib is more of a lab notebook.

The projects page is about it so far; this web site is growing slowly - like an oak tree. Yeah, that's the ticket.

 

Latest Experiment

I decided to try to see infrasound from the SpaceX launches in south Texas, about 300 miles from Austin and I'll be darned; I can! I needed two on calm days for comparison and the launches on 11/19/2024 and 1/16/2025 did the trick:

 

The blob of noise in the oval is what I suspected to be noise from the launch. The sound takes about 30 minutes to reach my house and that's the left end of the oval. The noise below 5 Hz was quite low that day. Below is the January launch stretched a bit (used a different technique for catching the image). Look how similar the noise looks; I "never" see noise that looks like that below 5 Hz with no noise at higher frequency. I think that the returning booster noise and sonic boom can be seen below; this time the booster returned to the launch pad . Passenger jets make low frequency noise but the noise extends into the hearing range (vertical red ovals show a couple).