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00:36 May-30-1998
Thomas Tolt, Ph.D.
Low Mhz absorption polymers

We are searching for optically transparent plastics
which have low longitudinal and transverse ultrasonic
absorption in the 1 - 10 Mhz range. We have seen the
best results with amorphous polystyrene and cross-linked
polystyrene derivatives. Is anybody aware of any other
plastic materials and or additional theoretical information?

Thanks in advance.

Tom Tolt


 
03:36 May-30-1998
R Freemantle
Re: Low Mhz absorption polymers : We are searching for optically transparent plastics
: which have low longitudinal and transverse ultrasonic
: absorption in the 1 - 10 Mhz range. We have seen the
: best results with amorphous polystyrene and cross-linked
: polystyrene derivatives. Is anybody aware of any other
: plastic materials and or additional theoretical information?

Dear Tom,

I have looked at a several transparent plastics and
have made both compression and shear wave measurements over
a 1 MHz - 40 MHz bandwidth. A quick look through my
results show that polystyrene had the lowest absorption values
compared to the others. These included PET (Compression wave
absorption about 2.5 dB/mm @10 MHz) and PES (about 2.3 dB/mm
@10 MHz). Most of the plastics I have looked at had an absorption
coefficient which is proportional to frequency.

What application are you planning to use these materials for ?

Regards,

Richard Freemantle

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| Dr. R.J. Freemantle |
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| UDSP Laboratory |
| Department of Physics |
| Keele University |
| Staffs, ST5 5BG, UK |
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| Fax +44 (0)1782 711093 |
| Email r.j.freemantle@elec.keele.ac.uk |
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