Re: Vibration Isolation

Posted by Deepak nair on
URL: http://confocal-microscopy-list.275.s1.nabble.com/Re-Vibration-Isolation-tp7582683.html

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Dear Listers,

Thank you all for on the list and off the list responses.

 I used the accelerometer as Ben suggested (with the help of colleagues
from physics/Engineering). I saw that most of the noise at the ground level
at our place was

compressor, Equipment and other noise making devices 4-25 Hz
Construction and building services 5-40 Hz (occasional peaking between
30-35 range ; don't know why)
Foot traffic on the corridor 1-10 Hz

I looked at the colleagues tables from different companies during the
experiment with differing thickness for the table top, most of them
performed well except for 4 Inch active table (at frequencies between
30-40)  which we don't know why.

Anyway thanks for all your help...

Deepak


On Mon, Sep 15, 2014 at 8:26 AM, Dan Focht <[hidden email]> wrote:

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> Post images on http://www.imgur.com and include the link in your posting.
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>
> Listers
>
> You might get a kick out of this.
> In the 70’s I was servicing for a Zeiss dealer.
> I was called to a hospital in Washington DC, ( of course), because their
> new ceiling mounted surgical Eye Scope became blurry.
> I went in and checked it out to find that when they installed their new
> air-conditioning compressor they installed it adjacent the mounting for the
> microscope!
>
> True story!
>
> Dan
>
>
>
> On Sep 14, 2014, at 8:25 PM, Smith, Benjamin E. <[hidden email]>
> wrote:
>
> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> If you want to be more rigorous, ask your engineering or physics
> department if they have a sensitive, calibrated accelerometer and a
> spectrum analyzer.  Place the accelerometer on the floor throughout the
> room you want to place the equipment, and hook it up to the spectrum
> analyzer.  This way you will know exactly the frequencies you need to damp
> out.
>
> Ben Smith
> ________________________________________
> From: Confocal Microscopy List [[hidden email]] on
> behalf of Deepak Nair [[hidden email]]
> Sent: Thursday, September 11, 2014 6:37 AM
> To: [hidden email]
> Subject: Vibration Isolation
>
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> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
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>
> Hi,
>
> We are planning to build a single molecule based super resolution system. I
> plan to put only a microscope on my active vibration isolation table. The
> weight of the optical components (including microscope)and accessories on
> the table would not exceed more than 100 Kg.
>
> Is it necessary to go for 6-8 inch thick breadboard for the active
> vibration isolation platfrom or an active vibration table with 4 inch
> breadboard be fine for the job?
>
> When I compare the graphs of the performance for the most of the active air
> based optical isolation platforms with breadboards (whether 4 inch or 8
> inch)  and with anti vibration frame  (cast or independent legs) perform
> well within the standard range ?
>
> Is there any specific rules for selecting active antivibration platforms ?
>
> Any input will be appreciated.
>
>
> Best
> Deepak
>
> --
> Deepak Nair
> Assistant Professor
> Centre for Neuroscience
> Indian Institute of Science
> Bangalore 560012
>

--
Deepak Nair
Assistant Professor
Centre for Neuroscience
Indian Institute of Science
Bangalore 560012