Re: Data acquisition for ICP accelerometers

["S. Stein" <stein@aps.anl.gov>]

As Mark pointed out, the APS has installed a few 3-axis accelerometer systems as a way of monitoring effects of large equipment near certain points of interest. These use Piezo transducers from a company named "PCB Piezotronics" coupled to an amplifier which - as Mark indicated - feed into an inexpensive USB ADC from Measurement Computing.

The system works under Windows currently due to the libraries which were supplied being Win32 based. We do have a student working on Linux drivers which have shown promise; enough that we hope our next installations will be under on a Linux OS.

I'll be happy to give you more info if this interests you,

--Josh


----- Original Message -----
From: "matthew pearson" <matthew.pearson@diamond.ac.uk>
To: mrippa@gemini.edu, tech-talk@aps.anl.gov
Sent: Wednesday, November 28, 2012 4:50:23 AM
Subject: RE: Data acquisition for ICP accelerometers

Hi,

This probably doesn't meet your requirements, but thought I'd mention it...

On at least one beamline at DLS we have a few Bruel & Kjaer charge accelerometers mounted inside a UHV double crystal monochromator. We use their Nexus amplifier to read the signals and feed them into a 16-bit ADC, and we control the amplifier via RS232. Then we do a FFT on the amplifier waveform data. But we only have a few channels to deal with, and we don't actively monitor the data (just analyse it on a ah-hoc basis when we have time).

However, we've only just started to use them so we don't have much experience with them so far. I'm not sure which actual accelerometer we're using, but the manufacturer has a range of different types. We use them for looking for mechanical vibrations in the 1-100Hz range.

http://www.bksv.com/products/transducers/conditioning/charge/2692c.aspx?JsEnabled=0

Emma Shepherd developed the streams based Epics support for the amplifier.


Cheers,
Matt


> -----Original Message-----
> From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-
> bounces@aps.anl.gov] On Behalf Of Matt Rippa
> Sent: 28 November 2012 02:39
> To: tech-talk@aps.anl.gov
> Subject: Data acquisition for ICP accelerometers
> 
> Hi,
> 
> Has anyone worked with vibration monitoring and analysis in
> EPICS? We're looking for a digitizing system with 24 or more
> channels and dynamic range of 96 dB or higher. Our sensors are
> ICP accelerometers with resolution down to 50 ug's (uV) and
> sensitivity of 1V/g.
> 
> It seems there are plenty of 'turn-key' systems out there with
> Windows only. For example, this is a good fit but no linux/epics.
> 
> http://www.spectraldynamics.com/index.php/products/puma
> 
> Thanks,
> -Matt


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