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600 views
09:04 Jun-08-2005
mohd hafiz fazalul rahiman
Acoustic impedance

hi.

I am confusing, which formula we use for calculating the acoustic impedance?

i) Transmission coefficient, D=(2*Z2)/(Z1+Z2)
OR
ii) Transmission coefficient, D=(4*Z1*Z2)/(Z1+Z2)^2

the equation (i) i get from Ultrasonic testing meterials from Krautkramer.

thanks.



    
 
06:49 Jun-09-2005

Paul A. Meyer

R & D,
GE Inspection Technologies,
USA,
Joined Nov 1998
47
Re: Acoustic impedance Hi,
Your equation (i) gives the AMPLITUDE of the transmitted wave. Your equation (ii) gives the POWER of the transmitted wave.
Paul

----------- Start Original Message -----------
: hi.
: I am confusing, which formula we use for calculating the acoustic impedance?
: i) Transmission coefficient, D=(2*Z2)/(Z1+Z2)
: OR
: ii) Transmission coefficient, D=(4*Z1*Z2)/(Z1+Z2)^2
: the equation (i) i get from Ultrasonic testing meterials from Krautkramer.
: thanks.
------------ End Original Message ------------





    
 


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