Re: Heating tape

[brian whatcott <inet@intellisys.net>]

At 01:08 10/10/98 -0400, you wrote:
> How about using a cathetometer??  Old, but still good.
>
> I like the laser interference technique mentioned by someone else.  That's
> just too cool, but perhaps not too cool pedagogically.
>
> Sam

I was not enthused.
For copper, alpha is 16.7E-6 per K
so a 10 cm specimen raised 1K moves 1.67 microns
or roughly 3 wavelengths.
 A visible interference difference looks for a quarter wave change.
Can you reliably and uniformly heat a specimen in 0.1K steps?
brian whatcott <inet@intellisys.net>
Altus OK