Re: Vibration Isolation

[Deepak nair]

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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:

> *****
> 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.
> *****
>
> 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
>
> *****
> 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.
> *****
>
> 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

[Craig Brideau]

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>
>
> Foot traffic on the corridor 1-10 Hz
>
>
I'm betting 10Hz was when somebody was running late... @:-)



> 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.
>

If the table is not broadband damped you can get odd resonant frequencies
that shoot right through the table. You can usually get frequency plots
from the manufacturers that show the response of a given table. Do keep in
mind that these plots are under ideal conditions with the table properly
mounted on its frame, properly leveled, etc.

Craig

>
> Anyway thanks for all your help...
>
> Deepak
>
>
> On Mon, Sep 15, 2014 at 8:26 AM, Dan Focht <[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.
> > *****
> >
> > 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
> >
> > *****
> > 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.
> > *****
> >
> > 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
>