The "Full Measurement System" is the best way to achieve an
optimized and exact measurement and following result.

• supersensitive accelerometers (1-dimensional or 3-dimensional),
• data-logger (µMusycs by IMC) and a PC,
• amplifiers and filters,
• external power supply connected with uninterruptible power supply,
• optional temperature sensor,
• optional GPS,
• optional radiation sensor,
• optional video camera.

The sensors FBA ES-T and FBA ES-U produced by Kinemetrics (USA) measure accelerations with a sensitivity of 10-6g up to 1g. The principle of measuring can be compared to an electronic spirit level where a mass is held in an electric field and its deviation from the zero position is measured.

The accelerometers are mounted on thick aluminium plates in order to avoid natural vibrations and to enable accurate levelling. The plates were constructed in such a way that their dead weights prevent a displacement of the sensor under dynamic loading.

In order to eliminate interfering signals from electric fields, for every metre flume an analog low-pass-filter is superposed on the data-logger. These filters can be adjusted from 0Hz to 50Hz. The filters can also be used to eliminate forced vibrations.

The amplifiers, model AMP-11, also built by Kinemetrics, are used to boost small ambient signals, thus enabling a reliable evaluation. The amplifiers are mainly used for large and rigid structures.

The accelerometers are connected by double shielded cables to the data-logger µMusycs by IMC (Germany). The cables used cause very low losses during transmission and are excellently shielded against external magnetic fields. The logger is equipped with a 16 Bit analogue-digital converter.

The µMusycs is connected via ethernet to an industrial PC which is equipped with a Pentium processor and a well sized hard disk.