VZJ -- Knight et al. 6 (4): 746 Figure IG5

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FIG. 5. Surface representing the Fréchet kernel F*(X,Y, ${tau}$ ) as a function of X and Y for X $≥$ 0 at dimensionless time ${tau}$ = 0.25. The kernel F*(X,Y, $1/4$ ) is for a dual-probe-heat-pulse sensor with heater probe at (X,Y) = (– $1/2$ ,0) and temperature probe at (X,Y) = ( $1/2$ ,0). The vertical line shows the location of the temperature probe at (X,Y) = ( $1/2$ ,0). Results are from Eq. [34]. The dimensionless kernel is negative everywhere, and there is no singularity at (X,Y) = ( $1/2$ ,0).