[time-nuts] temperature sensor
attila at kinali.ch
Sun Jul 20 17:28:24 EDT 2014
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.
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)
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