The foam I’ve used in this case looks like the stuff here: http://flyingeinstein.com/index.php/tutorials/barocover
There are forum posts about people using the black foam that hard drives are packed in, the foam on the inside of those squishy sanding blocks, and several other types. On my quadcopters with baros, I’ve always just hot glued the foam to the circuit board on either side of the baro. It’s tough to tell exactly, but this looks fairly similar to what I’ve used too: https://www.thefoamfactory.com/opencellfoam/filter.html HTH, -Bryan Sent from my iPhone > On Jun 19, 2019, at 9:30 PM, Keith Packard <[email protected]> wrote: > > Bryan Duke <[email protected]> writes: > >> One other thing I haven’t tried on a rocket is the technique that some >> quadcopter/drone pilots use on their baros of putting a little piece >> of foam on the top of the sensor. They do it to help smooth out the >> wind flowing around the sensor so that it gets smoother >> data. Something like that (foam + some hot glue) might add a >> baffle-like barrier that might help some. Just make sure it’s a pretty >> porous foam so that you’re not blocking the baro port. > > Can you point us to more information on this? We're struggling to find a > reasonable mechanism for blocking light from the baro sensor on our > MicroPeak product. I've done some testing, and light shining on the > sensor is really bad. We tried some self-stick porous foam (Poron > 50-30031-12X12P), but the adhesive isn't porous enough and when stuck > firmly to the sensor, it makes an air-tight seal. > > Glad you're finding ways to avoid the worst effects of corrosion. Not > sure what that spray will do on top of a GPS patch though; those are > rather sensitive to any materials. And, you probably want to find a way > to keep the gasses out of the inside of the baro sensor too, if you can. > > -- > -keith
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