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<== Date ==> <== Thread ==>

Subject: Re: Data acquisition for ICP accelerometers
From: Matt Rippa <[email protected]>
To: Mark Rivers <[email protected]>
Cc: "[email protected]" <[email protected]>
Date: Wed, 28 Nov 2012 17:22:26 -1000
Hi Mark,

This looks great.

Thank you,
-Matt


On 11/28/2012 05:05 PM, Mark Rivers wrote:
> Hi Matt,
> 
> I made measurements of the noise floor as a function of input
> voltage for the Measurement Computing 1608G-A20.
> 
> http://cars9.uchicago.edu/software/epics/measComp1608GDoc.html
>
>  On the +- 10V full scale, the noise floor is 1 bit (300
> microvolts) between -2V and 2V and less than 3 bits (1 mV)
> over the full +- 10V range.  The voltage source was the unit
> itself, so some of the noise might have been on the output,
> rather than the input.
> 
> Mark
> 
> ________________________________________ From:
> [email protected] [[email protected]]
> on behalf of Matt Rippa [[email protected]] Sent: Wednesday,
> November 28, 2012 8:54 PM To: S. Stein Cc:
> [email protected] Subject: Re: Data acquisition for ICP
> accelerometers
> 
> Our accelerometers are also from PCB Piezotronics. We use 
> model#'s 333B50 and some triaxial 356B18. Their resolution
> goes down to 50 ug so at some point I worry about the noise
> floor with the less expensive DAQ units. Have you had any
> concerns along these lines? I believe many sites are
> amplifying these signals to overcome this. The turn key
> systems I referred to are all significantly more expensive
> but the dynamic range is upwards of 144 dB.
> 
> Josh, I'm certainly interested to learn more about your
> system.
> 
> Thanks for all the input. -Matt
> 
> 
> On 11/28/2012 06:22 AM, S. Stein wrote:
>> 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" 
>> <[email protected]> To: [email protected], 
>> [email protected] 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: 
>>> [email protected] [mailto:tech-talk- 
>>> [email protected]] On Behalf Of Matt Rippa Sent: 28 
>>> November 2012 02:39 To: [email protected] 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
>> 
>> 
> 


References:
Re: Data acquisition for ICP accelerometers S. Stein
Re: Data acquisition for ICP accelerometers Matt Rippa
RE: Data acquisition for ICP accelerometers Mark Rivers

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