I have seen microcircuitry rooms that are vibration isolated
you need to cut a slot around the slab where the geophone will be located
then fill the slot with a material that will let the two slabs move
independently.
They build these rooms in a russian doll fashion because the traces are
so small on the microchips that the slightest vobration will
ruin the whole lot they are making.

----- Original Message ----- 
From: "ian" 
To: 
Cc: "PSN-Postlist" 
Sent: Sunday, April 29, 2007 23:53
Subject: Re: geophone too close ?


> Hi,
>
> could it be like the school experiment where you scatter salt on a metal
> sheet and then vibrate the sheet with a few KHz of sound.  The salt
> grains move to areas of the metal sheet where the vibrations are least.
> Perhaps your floor is like that, with parts of it vibrating less than
> others?  But does that meain that seismic vibration will be less there too?
>
> Ian
>
> Jón Frímann wrote:
>
>>hi all
>>
>>In a attemt to get rid of noise from varius sources, at least reduse it
>>a bit. I am testing to have my geophone in my computer room. But I did
>>notice on my Borgarnes test setup that the noise level was not much
>>diffrent in the corner then I was having on my main system (Hvammstangi)
>>at it's location in my apartment. But this means that the geophone is
>>less then three meters away from me. I do see footsteps and such noise,
>>but I do not get the door noise and the window noise that I get when I
>>open and close the window.
>>
>>I've like to get opinion on this if possible.
>>
>>Regards.
>>
>>
>
> Ian
> www.festivalpreviews.com
> -- 
>
> 
> 

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