| Electronics > Beginners |
| What options are out there for high sampling rate (>250 MHz) DAQ on a DIY budget |
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| jonathondk:
I'm looking to do impact triangulation on a steel plate using piezoelectric sensors similar to this: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3715253/ Speed of sound in steel: 5800 m/s Time for vibrations to travel 25 mm: 4.31e-6 sec Min sampling rate for a 25 mm accuracy: 232 MHz I've worked with arduino and beaglebone in the past but the sampline rate is about 100 times too slow. I'm up for building my own DAQ system, but I'm not sure where to get started there either. Thanks! |
| David Hess:
--- Quote from: jonathondk on May 30, 2018, 04:59:23 pm ---Min sampling rate for a 25 mm accuracy: 232 MHz I've worked with arduino and beaglebone in the past but the sampline rate is about 100 times too slow. --- End quote --- The Beaglebone PRU is suppose to be almost that fast. That is why I have been considering them for an open DSO in the 100 to 200 MSample/second range. |
| matseng:
Aren't you off by three orders of magnitude here? 1 / 4E-6 = 250 000 That's only 250 KHz... |
| bson:
You don't need to quantize signals, you only need to timestamp the leading edges. Any MCU with a 10MHz+ clock and timer-capture inputs should have no difficulty doing this. Which is pretty much anything out there today... |
| nfmax:
By far the cheapest high-speed digitisers come in the form of DSOs. Complete with signal conditioning, triggering, and waveform monitoring ;) |
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