Samuel M. Goldwasser wrote in message
...
This is strange.

I have an LCD optical polarization rotator. It's basically a single
pixel panel a bit less than 1 cm square. It rotates the optical
polarization of a laser when driven with a TTL squarewave.

Those details are not important though.

The bare glass panel was dropped. And when retrieved with NO visible
damage - no cracks or breaks in the sealing - a small blemish could be
seen
about 1/3rd of the way in from one side. This was not near any seam
and there was no evidence of any crack. What's more, the blemish -
which had the appearance of an irregular bubble - could be pushed
over to one edge by gently massaging the glass panel,
where it spread out but happily remained at the edge,
with apparently no effect on the performance of the device.

So, where did it come from? Is it actually an area of vacuum that
formed when the LCD material was pulled away from the glass?

Just curious.

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Vacuum bubbles are powerful beasts. See cavitation effect around ship's
propellors- pits the bronze. Maybe even cold-fusion, not the Fleichman-Ponns
one, sonofusion.


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