Civil Engineering Reference
In-Depth Information
Fig. 4.7
VW Displacement Transducer Parallel to Joint
Each VW displacement transducer was uniquely calibrated before installation, and
a calibration record for individual transducers was produced. Upon excitation by
the datalogger, the change in frequency produced by the transducer was read in Hz
and converted into millimeters using the calibration factors and Eq.4.1 below.
D
=
Ax
2
+
B x
+
C
(4.1)
whereA, B, and C are the manual calibration factors. Once the frequency readings
are converted in millimeters, the joint displacement was then calculated using
Eq.4.2 below.
Δ
D
=
D
i
- D
d
(4.2)
