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Date: Thu, 5 Sep 2024 17:35:32 +0200
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Subject: Re: Accelerometers for >1000g measurements
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On 2024-09-05 00:30, Phil Hobbs wrote:
> So for this customer gig I need to measure the actual acceleration of a parallel-rod transmission line that's being pounded into the ground with a built-in slide hammer.  (It's for measuring soil moisture and salinity by TDR.)
> 
> We're thinking about putting the TDR pulser and sampler in the part that gets pounded (in a potted module obviously), so knowing how bad the acceleration gets is going to be important.  I expect that it'll be several hundred g in volcanic soil, so a full-scale range of 1000-2000 g would be about right.
> 
> None of the MEMS IC accelerometers go anywhere near that high. Measurement Specialties makes them, but they're $160 in onesies, e.g.
> 
> <https://www.digikey.com/en/products/detail/te-connectivity-measurement-specialties/830M1-2000/14118098>
> 
> Anybody used them?
> 
> Cheers
> 
> Phil Hobbs
> 

I've measured big fast forces using strain gauges.
If you can be sure the place where you place that on the metal rod stays elastic during the acceleration the bandwidth should not be a problem.
Now, computing a calibration and amplifying that signal is the next problem...

Arie