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Capture Peak Strain Gage Fluctuation For Shotgun Chamber Pressure Measurement

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Silver_Is_Money:

--- Quote from: tautech on December 17, 2023, 11:44:03 am ---Similar to the decades old 6.5/06 then.

--- End quote ---
Yes, but with roughly 10% more internal capacity.

voltsandjolts:
The term 'piezo' transducer is a little vague, it could mean either piezoelectric or piezoresistive. Piezoelectric are the more traditional sensor for fast dynamic pressure measurements, combustion engine, explosive detonations etc. Kistler and PCB Piezotronics are the better known dynamic sensor manufacturers. Also well known for taking lots of your money :-)

https://www.pcb.com/Contentstore/mktgcontent/LinkedDocuments/Aerospace/AD-BallisticPressureGuide_LowRes.pdf
https://en.wikipedia.org/wiki/Small_arms_ammunition_pressure_testing

Silver_Is_Money:
For the goal of utilizing an Oscilloscope to measure 'relative' shotgun chamber pressure as strain gage voltage output variation (linear to pressure) across a Wheatstone Bridge, would it be best to utilize DC or AC?

babysitter:
Recommend DC, bridge current as high as reasonable without temperature/drift swamping your signal too much.
Use a instrument amplifier IC as a simple preamp. You might want to dive into https://www.analog.com/media/en/technical-documentation/application-notes/an43f.pdf in case you want to go deeper in the rabbit hole.

BR
Hendrik

Kleinstein:
Definitely DC as the relevant signal is only short, like a few ms at most. AC drive is a thing if one cares about long time drift and 1/f noise from the amplifier.
For the amplifier I would consider a normal single ended amplifier and have a floating (e.g. battery) to provide the bridge drive. It is about getting lowest noise and the scope input directly is not really made for such low impedance (e.g. 350 ohm for common strain gages).

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