Speed and Attenuation of Ultrasonic Sound in Air


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Topic: Science > Physics
User: "Jabir"
Date: 04 Feb 2005 01:19:54 PM
Object: Speed and Attenuation of Ultrasonic Sound in Air
Hi,
I am doing a Physics project on speed and attenuation of ultrasound in
air.
The sound I am using is of frequency 40kHz and generated using a
piezoelectric ultrasonic transducer.
I need some help with the theory related to this.
I would like to know:
* Why/how ultrasound attenuates in air (Reasons: absorption?
dispersion? etc.), please explain in detail.
* Also about applications of ultrasound, related to speed/attenuation
in air.
Thanks.
.

User: "Sam Wormley"

Title: Re: Speed and Attenuation of Ultrasonic Sound in Air 04 Feb 2005 02:01:17 PM
Ultrasound attenuates in air by
o scattering
o diffraction
o inverse square law at distances >> source size
o absorption
http://www.ndt-ed.org/EducationResources/CommunityCollege/Ultrasonics/cc_ut_index.htm
.


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