[time-nuts] temperature sensor

[Attila Kinali]

On Sun, 20 Jul 2014 15:57:24 -0400
Chuck Harris <cfharris at erols.com> wrote:

> I initially thought that it might be a transmission sort of effect, where
> the light intensity changed with temperature, but its total lack of sensitivity
> to being in a liquid, kind of makes that unlikely.

Nope, it's a path length difference system.
There is a small, temperature dependend crystal at the tip.
The device measures the optical length of this crystal.

See: http://www.emeraldinsight.com/content_images/fig/0870260309013.png

I'm sure there are other ways as well, like using distributed fiber
gratings (a change in length means a change in "resonant" frequency/wavelength)
but i have no references for such (though, i haven't searched either)

			Attila Kinali

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