Operation
MXFS
A05595_02_E00_00
HBM: public
61
The Thermal Expansion Coefficient (CTE) to use must be the one of the mate
rial the strain sensor is attached to. This will eliminate the effect of the thermal
expansion of the material of the strain measurement. In case this expansion is
not to be corrected, the value to use should be zero (0.0).
The reference wavelength of the FBG strain senor (λ
0
) and the Reference
Temperature (T
0
) should correspond to the strain sensor’s wavelength at the
zero strain instant and to the temperature measured by the temperature sensor
at that same instant. These values should be measured after installation. They
can be filled by hand or automatically defined by an actual measurement using
the
Measure
button.
Strain with compensation using a temper
ature sensor
λ
*
λ
0
k
@
λ
0
*
(
CTE
)
TCS
)(
T
*
T
0
)
Using a compensation FBG
This compensation method should be selected when using another strain sen
sor that is attached to the same material, but only experiencing the same tem
perature changes and no mechanical strain, for temperature compensation.
The selected channel for temperature compensation with this method must be
a strain channel (ε
TC
).
