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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: Freezing CDs/DVDs posted by unclestu52 on August 13, 2007 at 13:38:20:
Got a private email from a person involved in the cryogenic business, and he confirms that the plastic substrate is being affected. The claim is that the freezing indeed reduces residual stresses in the disc and reduces bi refringence, a fancy word for the laser light reflected does so without being being affected by those stress patterns which can cause a bit of distortion to the beam. That would explain why the Moire patterns under strong light also appear different. Those are those funny 'wrinkles' you can see in things like large sheet glass windows.
He also points out that stress relieving the plastic reduces the 'Q' of the resonance of the disc itself.
FWIW, of course YMMV.
Stu
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Follow Ups
- an addition - unclestu52 08/13/0722:48:05 08/13/07 (6)
- RE: an addition - Ted Smith 10:00:10 08/14/07 (5)
- That's a good question - unclestu52 11:24:37 08/14/07 (4)
- RE: That's a good question - May Belt 14:33:37 08/15/07 (3)
- RE: That's a good question - Mark W. 15:28:04 08/15/07 (2)
- RE: That's a good question - May Belt 01:20:42 08/16/07 (1)
- RE: That's a good question - May Belt 03:38:17 08/16/07 (0)
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