HBM FS64, Installation Manual

Page: 34 / 36

Sensor Configuration
34
A4263-3.5 HBM: public
FS64
3.1.1 General Information
Number 1 in Fig. 3.1 shows the general information on
the particular sensor, such as its type, the sensor part
number and its serial number.
3.1.2 Technical Information
The most important information related to the tilt sensor -
the two central wavelengths at room temperature and
sensitivity - is shown in the technical information table
(number 2 in
Fig. 3.1 ). These values should be used for
tilt computation.
3.1.3 Tilt Computation
Number 3 in Fig. 3.1 exemplifies the calculations that
should be performed for wavelength measurement to tilt
conversion.
The tilt variation of a tilt sensor is given by the multiplica­
tion between the difference of the wavelength shift from
each FBG and the sensor sensitivity.
tilt
+
( X
2
*
X
1
) S
´
tilt
+
[( WL
2
*
CWL
2
)
*
( WL
1
*
CWL
1
)] S
Fig. 3.2
Where
S
x
n
is the wavelength shift from FBG n in pm, where
x
2
>x
1
.
S
S is the given sensitivity in pm/deg