Phased Array PCB V0.1 Finished
Not tested yet, but here are some images of the finished PCB!
Image 1 img_0002.JPG Image 3 Image 4
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April 2008
Viscosity, not surface tension, is key to mitigating bubble formation - All rise for the scientific Jelly!
Over the past week I have had enough of the surface tension tests since I was getting nowhere. I redid the low surface tension (Ethylene Oxide) and the high surface tension (salt) tests to get some more resolute data. (I thought I might have just been either putting too much in at a [...]
PCB Manufacture notes and PreAmpV0.2 Died!
Just for future reference (because I always forget), using the naff double sided PCB, 3:30 exposure was enough, but by far and away the most important point was to remember to jam the acetate down to the exposure unit, to the point of stressing the joints. Too many times have I relied on the [...]
New surface tension vs. drop bubble thoughts.
After lots of testing, here is the brief version. What I have found is that if you lower the surface tension, you increase the longevity and the size of bubbles under, and on top of the water. If you increase the surface tension, the opposite happens. You get lots of tiny bubbles. Neither actually gets [...]
Speed test: c++ vs Matlab - Using Multilateration Routines
Quick update, I wanted to try the matlab vs c++ routines again, because from what I can remember, matlab was several orders of magnitude quicker than the c++ program. But I recently found a library in Qt called QVector, which claims to be very quick on the
whole memory front. So I went back [...]
Qt Errors and Answers
This is a post containing all the problems I had installing and using Qt. Most of them can be fixed quite simply.
Qt:__________________________________________________________
Error: Qt does not compile certain programs on Windows Vista (In my case this was qwt)
Error Code: “gcc: installation problem, cannot exec `cc1′: No such file or directory”
Solution:
to solve the problem, you have [...]
Long time no see
Haven’t updated in a while. Cracking on with the PhD doing lots of experimental work. Lots of time has been put into experimenting with the new hardware setup, PC->NI DAQ->Single Hydrophone, playing with all sorts of different concoctions. Results have been adequate, but not astonishing. The expected amount of bubble noise [...]