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From: john larkin <jlarkin_highland_tech>
Newsgroups: sci.electronics.design
Subject: Re: Accelerometers for >1000g measurements
Date: Thu, 05 Sep 2024 20:55:32 -0700
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On Thu, 5 Sep 2024 12:09:36 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>On 2024-09-05 11:10, Glen Walpert wrote:
>> On Thu, 05 Sep 2024 07:07:25 -0700, john larkin wrote:
>> 
>>> On Thu, 05 Sep 2024 06:22:04 GMT, Jan Panteltje <alien@comet.invalid>
>>> wrote:
>>>
>>>> On a sunny day (Wed, 04 Sep 2024 19:57:04 -0700) it happened john larkin
>>>> <jlarkin_highland_tech> wrote in
>>>> <md7idj1plqodnthuqpcemaphbrtotlqveh@4ax.com>:
>>>>
>>>>> On Wed, 4 Sep 2024 18:30:46 -0400, Phil Hobbs
>>>>> <pcdhSpamMeSenseless@electrooptical.net> 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.
>>>>
>>>>
>>>> If you can make it emit some ultrasonic sound you can measure the
>>>> received frequency shift from far away?
>>>> Same for RF likely...
>>>> ?
>>>
>>> No, just measure the voltage or the charge that it generates under
>>> acceleration. It's a polarized, piezoelectric ceramic thing for 30
>>> cents.
>>>
>>> https://www.mouser.com/c/?q=ceramic%20resonator
>>>
>>> One might also measure its resonant frequency vs acceleration.
>>>
>>> I wonder how one would test it. At 2000 g's.
>> 
>> Compare to a single expensive calibrated accelerometer?  Not familiar with
>> Measurement Specialties, other possibilities are:
>> 
>> https://www.kistler.com/INT/en/c/accelerometers/CG21-accelerometers
>> https://buy.endevco.com/accelerometer
>> 
>Thanks, Glen, good leads.
>
>The PCB Piezotronics folks (formerly Endevco) have the single-axis, 
>+-50k gees model 350D2 for $1200ish in onesies, which we may wind up buying.
>
>Cheers
>
>Phil

Do you only need one. or do you want to put one into every probe?

If it's one, buy something expensive and calibrated.