Hi All,
I was looking at an integrated file from my long period horizontal and =
several questions arose. First, since this is a velocity sensor the =
integration should provide displacement. What I am finding is that the =
integrated data does not start at zero. I would anticipate that with no =
starting conditions known the displacement would be constrained to zero =
initially. Secondly, this particular data begins with positive velocity =
but the integration gives a negative displacement. Here are the first 8 =
points of data and the integration. I used the PSN2TEXT.exe to extract =
the data file and I used cursor position on the WinQuake screen to get =
the integrated points. The DC offset is about -5 for the file so data =
should be reduced by that amount and the rate is about 1.2 sps. Does =
anyone have an explanation?
Data:
integrated
=20
7
-73=20
=20
7
-71=20
=20
-1
-76=20
=20
-1
-81=20
=20
2
-83=20
=20
3
-85=20
=20
5
-86=20
=20
Hi All,
I was looking at an integrated file =
from my long=20
period horizontal and several questions arose. First, since this =
is a=20
velocity sensor the integration should provide displacement. What =
I am=20
finding is that the integrated data does not start at zero. I =
would=20
anticipate that with no starting conditions known the displacement would =
be=20
constrained to zero initially. Secondly, this particular data =
begins with=20
positive velocity but the integration gives a negative =
displacement. Here=20
are the first 8 points of data and the integration. I used the=20
PSN2TEXT.exe to extract the data file and I used cursor position on the =
WinQuake=20
screen to get the integrated points. The DC offset is about -5 for =
the=20
file so data should be reduced by that amount and the rate is about 1.2=20
sps. Does anyone have an explanation?
Data:
integrated
7
-73
7
-71
-1
-76
-1
-81
2
-83
3
-85
5
-86 =