PSN-L Email List Message
Subject: Re: geophone too close ?
From: ChrisAtUpw@.......
Date: Mon, 30 Apr 2007 14:43:11 EDT
In a message dated 2007/04/30, carpediem1@......... writes:
> Avoid using foams or Styrofoam as they have minute air pockets in them and
> as pressure changes, they will expand or contract and these changes will be
> transmitted to the instrument.
Hi Bob,
Have any problems of this sort been actually documented? We have been
using Cellotex cases for years apparently without problem. This is a sealed
cell styrofoam with two layers of glass scrim glued to the surfaces. I would not
rest my seismometer on such, but I would not expect any problems with a
Cellotex case which is supported on the floor. The total mass is low.
How would this be transmitted to the instrument?
Regards,
Chris Chapman
In a me=
ssage dated 2007/04/30, carpediem1@......... writes:
Avoid using foams or Styrofoam=20=
as they have minute air pockets in them and
as pressure changes, they will expand or contract and these changes will be<=
BR>
transmitted to the instrument.
Hi Bob,
Have any problems of this sort been=20=
actually documented? We have been using Cellotex cases for years apparen=
tly without problem. This is a sealed cell styrofoam with two layers of glas=
s scrim glued to the surfaces. I would not rest my seismometer on such, but=20=
I would not expect any problems with a Cellotex case which is supported o=
n the floor. The total mass is low.
How would this be transmitted to the in=
strument?
Regards,
Chris Chapman
[ Top ]
[ Back ]
[ Home Page ]