I have to reiterate my suggestion for using ultrasonic detection. Link
to common detector board:
http://www.amazon.com/SainSmart-HC-SR04-Ranging-Detector-Distance/dp/B004U8TOE6
ranging distance : 2cm~500 cm
resolution : 0.3 cm
which should cover just about any tank size used by folks on this list
in a foreseeable future.
Now you just have to make it work in a cryo/pressurized environment.
Make the two transducers sense through holes in the bulkhead, and let
the rest of the PCB sit outside (or in a cage at same pressure). For $10
how much is there to lose to see if it works?
/H
------ Original Message ------
From: "Uwe Klein" <uwe@xxxxxxxxxxxxxxxxxxx>
To: arocket@xxxxxxxxxxxxx
Sent: 9/16/2015 9:44:10 AM
Subject: [AR] Re: radar fluid level monitoring
Am 16.09.2015 um 10:28 schrieb John Dom:
Uwe Klein wrote on 15 september 2015That was ~30 years ago.
a twin set of microwave doppler radar thingies repurposed from pissoirflushing activators ( you retreat and flushing advances ) arranged in a 45°
forward and 45° backward looking setup to remove attitude influences.
The sensors where (afair) Panasonic microwave pissoir flushing activators.
Taken apart to get at the doppler signal and arranged pairwise
looking 45° forward and back down onto the road. ( $ forward - $backward = true forward speed )New to me. Since you know, you have a catalog or website about such radar
sensors, so I don't have to Google on this? Preferably with a digital fluid
level output?
today probably two of these would work ( IANAL or the TEC equiv ):
http://www.amazon.com/SMAKN-Microwave-10-525GHz-Doppler-Detector/dp/B00FFW4AZ4
1mW ERP or thereabouts ?
Could their microwave radiation detonate N2O vapor inside its pressurized
tank?
But it is _Doppler_ as in SPEED detection ;-)
A Level sensor would not be a proper application for these.
Maybe if the level change is fast enough to give a useful doppler signal? Long thin tank? could work ;-)
uwe
