Hi,
 
    There is a very useful Jan 2005 Revue Article by A  J Bedard on 
Infrasonic Signals of many sorts and their characteristics at  
_http://www.etl.noaa.gov/et1/infrasound/Monthly_Weather_Rev_Paper_Jan05.pdf_ 
(http://www.etl.noaa.gov/et1/infrasound/Monthly_Weather_Rev_Paper_Jan05.pdf) 
 
    There are other useful links at _http://www.etl.noaa.gov/et1/infrasound/_ 
(http://www.etl.noaa.gov/et1/infrasound/) 
 
    Apparatus is described at 
_http://www.tornadochaser.net/research/infasonicdetector.pdf_ (http://www.tornadochaser.net/research/infasonicdetector.pdf) 
 
    The reduction of wind noise is the major problem  when trying to receive 
infrasound signals. Large sensor arrays of 'leaky tube'  of up to several 
hundred feet in diameter may be used. For a single sensor  head see US Patent No 
4,838,087 June 1989, Bedard and Nishiyama, 'Quad Disk  Static Pressure Probe'.
 
    Regards,
 
    Chris Chapman





Hi,
 
    There is a very useful Jan 2005 Revue Article b=
y A=20
J Bedard on Infrasonic Signals of many sorts and their characteristics at=20
 http://www.etl.noaa.gov/et1/infrasound/Monthly_Weather_Rev_Paper_Jan=
05.pdf
 
    There are other useful links at http://www.etl.noaa.gov/et1=
/infrasound/
 
    Apparatus is described at http://=
www.tornadochaser.net/research/infasonicdetector.pdf
 
    The reduction of wind noise is the major proble=
m=20
when trying to receive infrasound signals. Large sensor arrays of 'leaky tub=
e'=20
of up to several hundred feet in diameter may be used. For a single sen=
sor=20
head see US Patent No 4,838,087 June 1989, Bedard and Nishiyama, 'Quad=20=
Disk=20
Static Pressure Probe'.
 
    Regards,
 
    Chris Chapman