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Teletest

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Technical Discussions
Hector Guzman
Hector Guzman
04:55 Feb-10-1999
Acoustic Absorption Coefficients

Hi. Does anyone know of a good book on 'properties of material' that also contains information such as the acoustic absorption coeffiecinet for those materials. Specifically I would like to attain the absorption coefficients for polystyrene, polypropylene, and polyethylene.

-hector


    
 
 
Wies³aw Bicz
Wies³aw Bicz
01:14 Feb-10-1999
Re: Acoustic Absorption Coefficients
: Hi. Does anyone know of a good book on 'properties of material' that also contains information such as the acoustic absorption coeffiecinet for those materials. Specifically I would like to attain the absorption coefficients for polystyrene, polypropylene, and polyethylene.

: -hector

You can find this information in many books, but it wont help you very much. There are many kinds of plastics on the market, having
different properties. Absorbtion is also very frequency dependent. It is much better to measure it. If you don´t need very high accuracy it is not difficult.
If you need a high accuracy we can help you - we are working on a device doing all such measurements with high accuracy.

W. Bicz


    
 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
05:13 Feb-10-1999
Re: Acoustic Absorption Coefficients



    
 
 
Grant Gordon
Grant Gordon
06:49 Feb-10-1999
Re: Acoustic Absorption Coefficients
Greetings Hector,
I have recently measured the frequency dependent attenuation values for polycarbonate, acrylic,
linear low density polyethylene, PVC, and a polybutadiene over the frequency range of 1.5 - 9 MHz.
These results are part of a paper to be published in the SPIE Conference proceedings
on Ultrasonic Transducer Engineering to be held in San Diego CA, 20-26 February, 1999. If you are
interested I will send you a hard copy via mail - the electronic file is quite large.
Sincerley
Grant Gordon





    
 
 
Robert A. Day
Engineering
Milky Way Jewels, USA, Joined Nov 1998, 40

Robert A. Day

Engineering
Milky Way Jewels,
USA,
Joined Nov 1998
40
02:16 Feb-10-1999
Re: Acoustic Absorption Coefficients
: Hi. Does anyone know of a good book on 'properties of material' that also contains information such as the acoustic absorption coeffiecinet for those materials. Specifically I would like to attain the absorption coefficients for polystyrene, polypropylene, and polyethylene.

: -hector

I would also recommend Alan Selfridge's paper on measuring ultrasonic properties. His procedure is one of the best procedures for quick reasonably accurate measurements.

I would also warn you that polymers often have different acoustic properties depending on the conditions of manufacture. This includes thicknes as well as temperature and the actual chemistry used. It is essential to keep this in mind when making samples to measure. Thin layers are frequently different than the bulk.


    
 
 
gina
gina
06:13 Apr-01-2000
Re: Acoustic Absorption Coefficients
: Hi. Does anyone know of a site that will give me a list of materials and their absorption coefficients?

gina


    
 
 
yuksel guney
yuksel guney
01:42 May-08-2000
Re: Acoustic Absorption Coefficients of polyvinyldenefloride
: : Hi. Does anyone know of a good book on 'properties of material' that also contains information such as the acoustic absorption coeffiecinet for those materials. Specifically I would like to attain the absorption coefficients for polystyrene, polypropylene, and polyethylene.

: : -hector

: You can find this information in many books, but it wont help you very much. There are many kinds of plastics on the market, having
: different properties. Absorbtion is also very frequency dependent. It is much better to measure it. If you don´t need very high accuracy it is not difficult.
: If you need a high accuracy we can help you - we are working on a device doing all such measurements with high accuracy.

: W. Bicz




    
 
 
paco
paco
07:57 Oct-13-2000
Re: Acoustic Absorption Coefficients
: : Hi. Does anyone know of a good book on 'properties of material' that also contains information such as the acoustic absorption coeffiecinet for materials.


    
 
 
Ales Globevnik
Ales Globevnik
02:27 Mar-22-2002
Re: Acoustic Absorption Coefficients
Hellooo , I am also looking for absorption coefficients for materials. Please let me know if anybody know where can I found them.



    
 
 

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