,



Subject: Infra-Sonic Atmospheric Air Pressure Sensor
?http://sites.google.com/site/seismicsensorinfo/infra-sonic-atmospheric-ai=
r-pressure-sensor?? The goal is to try to correlate atmospheric pressure=
 changes with vertical seismometer background noise.=20
Gary
?
?Hi Gary,
?
??? There are three approaches to correcting for signals produced by atmos=
pheric pressure
?changes. 1 enclose the seismometer in a hermetic chamber. 2 Measure the=
 air pressure changes and compensate using a digital correction signal 3=
 Fit a compensation chamber to the other side of the seismometer hinge. Th=
is can give perfect balancing and was used in1960-70 old type seismometers=
.. Try using Al drinks cans? It?may be?easy to set up and it is cheap!
?
??? Regards,
?
??? Chris Chapman
?
?
?
?
Gary Lindgren
585 Lincoln Ave
Palo Alto CA 94301
?
650-326-0655
?
www.blue-eagle-technologies.com?? Check out Lastest Seismometer Reading
cymonsplace.blogspot.com?
sites.google.com/site/seismicsensorinfo/Home??? Design Details for New Ver=
tical Seismometer=20
?
?


,









Subject: Infra-Sonic Atmospheric Air Pressure Sensor

 http://sites.google.com=
/site/seismicsensorinfo/infra-sonic-atmospheric-air-pressure-sensor &=
nbsp; The goal is to try to correlate atmospheric pressure changes wit=
h vertical seismometer background noise. 








Gary


 


 Hi Gary,


 


    There are three approaches to co=
rrecting for signals produced by atmospheric pressure


 changes. 1 enclose the seismometer in a herme=
tic chamber. 2 Measure the air pressure changes and compensate using a dig=
ital correction signal 3 Fit a compensation chamber to the other side of=
 the seismometer hinge. This can give perfect balancing and was used in196=
0-70 old type seismometers. Try using Al drinks cans? It may be =
easy to set up and it is cheap!


 


    Regards,


 


    Chris Chapman


 


 


 


 


Gary Lindgren


585 Lincoln Ave


Palo Alto CA 94301


 


650-326-0655


 


www.blue-eagle-technologies.com   Check out Lastest Seismome=
ter Reading


cymonsplace.blogspot.com&=
nbsp;


sites.goo=
gle.com/site/seismicsensorinfo/Home    Design De=
tails for New Vertical Seismometer 


 


 



=3D