>>Did he solve the problem of how to sense corrector temperature without
>>touching it or obstructing the optical path?
>
>No. I'm not sure why you care about not touching it. But there are
>several approaches that might work:

I care about not touching it because I want to measure the temperature of
the glass towards the center, where it is likely cooler than at the edges.
It doesn't help to measure the edge of the glass if the center is cooler
(farther from the heat source) and therefore may dew up. A good place for
a wired sensor would be right at the secondary mount, but unless they were
routed straight back towards the primary and through the exit port, any
wires would introduce diffraction effects. Hence my interest in I/R
non-contact sensing.

>1. Mount the sensing transistor on the corrector and don't worry about the
>tiny obstruction that would result.

A possibility with a very small sensor, but again, a problem with the
connecting wires unless the sensor is right at the edge.

>2. mount the sensor on the retaining ring that holds the corrector perhaps
>with something that improves the thermal conductivity

Same problem. I don't want to measure the edge of the corrector.

>3. mount the sensor on the edge of the corrector (the curved part); this
>would be tricky since there isn't much room in there

Same....

Remember, my goal would be to use the least amount of heat that will still
keep all of the corrector dew free.


Paul Goelz
Rochester Hills, MI

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