Re: Air/gas transmission

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Re: Air/gas transmission
Posted by: Wieslaw Bicz , E-mail: optel@optel.com.pl, on July 27, 1999 at 16:37:28 :
In Reply to: Air/gas transmission posted by : Simon Griffin on July 27, 1999 at 15:47:36:
: 'Gases are generally rather attenuating in the MHz range', Does anybody
: have any tables or graphs representing this. After extensive searching
: I cannot quantify this statement.
: Regards
: Simon Griffin B.Eng IoM
You can find some tables and graphs in Landold Börnstein: Molecular Acoustics or in older books (written about 1930).
It is difficult to find such data in newer books. If you are interested, I can send you the copies of such tables.
But you must know - if you will test sound propagation in air, it will be difficult to make reliable measurements with frequencies higher then about 2 MHz under
normal atmospheric condistions (without higner pressure). We have made some experiments with such frequencies and the results are not easy to compare.
You will need to find a good method for such measurements.
Sincerely

Follow Ups:

Re: Air/gas transmission Leon Vandervalk 18:11:34 9/02/1999 (0)

Re: Air/gas transmission Leon Vandervalk 15:20:24 9/02/1999 (0)

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: : 'Gases are generally rather attenuating in the MHz range', Does anybody : : have any tables or graphs representing this. After extensive searching : : I cannot quantify this statement. : : Regards : : Simon Griffin B.Eng IoM : You can find some tables and graphs in Landold Börnstein: Molecular Acoustics or in older books (written about 1930). : It is difficult to find such data in newer books. If you are interested, I can send you the copies of such tables. : But you must know - if you will test sound propagation in air, it will be difficult to make reliable measurements with frequencies higher then about 2 MHz under : normal atmospheric condistions (without higner pressure). We have made some experiments with such frequencies and the results are not easy to compare. : You will need to find a good method for such measurements. : Sincerely

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