The Rebar strain gauge operates on the established Vibrating Wire principle, whereby a wire held under tension is read by an excitation/reading coil. Any change in the strain (tension) on the wire causes the resonant frequency of the wire to alter and is directly proportional to strain changes in the member being monitored.

The Rebar and Sisterbar Strain Gauge consist of a sealed element containing the wire, which is de-bonded from the concrete by a plastic coating.This is attached to two lengths of rebar, one at either end, which in turn are used to transfer strain from the structure to be monitored to the gauge. These rebar extensions are long enough to ensure full transfer of the strain within the concrete to the strain gauge.

The sensor can be read with any commercially available Vibrating Wire readout and the intergrated thermistor allows for temperature data to be recorded to aid the evaluation of thermally induced strains. As with all Vibrating Wire instruments, the use of a frequency based signal allows for long cable runs (in excess of 1000m) between the instrument and the readout point or datalogger.

Robust, reliable and easy to use
Suitable for remote reading and data logging
Waterproof
Individually calibrated
Can be used with long cable lengths with no degradation of signal
Long term stability
Unaffected by bending
Integral Thermistor

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