TCi Operator Manual
97
C
is the
1/m
value for vacuum.
1
e
M
C
(
C
m
s
W
2
)
(20)
e
1
, sensor effusivity can be calculated from (20).
In practice, for high effusivity (high k) materials equation (13) is inaccurate, because the heat
flows also laterally and the one-dimensional heat flow assumption is no longer satisfied.
Equations (13), (14) and (15) are only approximate.
A better representation of this case can be achieved by a second order polynomial
approximation. Example of sensor effusivity calibration curve using metals is given below.
This curve can be mathematically described (instead of (17)) as:
C
e
M
e
M
m
2
1
2
2
2
1
(21)
Where
M
2
and M
1
describe the curve of the effusivity calibration and are proportional to:
G
A
I
M
1
1
(
Amp
W
C
m
2
)
(22)
And
C
is the same expression as in (17), i.e.
1/m
value for vacuum.
Equation (21) is deducted empirically.
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