Fig. 3. Measurement of velocity-undercooling function. Top
circuit measures interface velocity as in Fig. 2. This is built on top
of a thin Pt layer
which never melts, the resistance of which tells us the temperature
of the Pt layer. Because this is quite close to the interface and because
we know
exactly where and at what rate the latent heat is being dumped,
we can calculate the correction (DTcorr)
fairly well, permitting a determination of
the temperature of the interface itself, or its undercooling (DTu)
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