contactless temp.measurement

[Tony Williams]

After reading your post I read up on this a little bit. It sure
sounds to me like the best bet mentioned so far. It is
contactless, and doesn't require the wire to fill the field of
view. Emissivity is less of a problem with the dual wavelength
setup than with single wavelength techniques. And I don't see why
reflections can't be eliminated as a problem with proper shading
of the measurement area.

Maybe use an identical static wire, fixed at the required
temperature, and servo for zero difference between the
static and moving wires.

 

[Ron Amundson]

After reading your post I read up on this a little bit. It sure sounds to
me like the best bet mentioned so far. It is contactless, and doesn't
require the wire to fill the field of view. Emissivity is less of a
problem with the dual wavelength setup than with single wavelength
techniques. And I don't see why reflections can't be eliminated as a
problem with proper shading of the measurement area.

Its been commonly done in wire processing for years. Some places even
use multi-wavelength infrared measurements for certain alloys or very
fine wire. If you do use dual-wavelength, be sure you can adjust the
E-slope.

 

[R.Legg]

The subject was pretty clear - "contatcless temp. measurement"...

The original poster elaborated on this. He doesn't seem to be looking
for a scientific instrument, so much as reliable control.

Sometimes thinking 'out of the box' is just plain diversion.

RL