Reliable sensor technology
The basic instruments used for the measurement are strain-gauges, which are attached directly to the structure of the bridge or as sensing element in the force sensors. Strain-gauge based sensors have the advantage of high long-term stability. This is important in this project because they are operational during the whole lifetime of the new bridge and it is not possible to stop the monitoring for recalibration.
In addition to this, the
HBM strain gauges of the LY41-series, which are used in this application, offer a good temperature compensation, which is a must, as the structure is faced with several weather and temperature conditions.
For data acquisition, HBM's
PMX system is being used.
After the installation, the measuring point is covered to prevent damage and electromagnetic interference (EMI).