Editor’s note: The following is an introduction to a concrete compression sensor, a device that might be useful on some turbine foundations. The full brochure is here: http://goo.gl/eqZRG8
The RSS-X series of acousto-elastic sensor, from Germany-based IBJ Technology, measures variations in compressive stress and load, which allows stress evaluations when a material’s modulus of elasticity is unknown or anisotropic and inhomogeneous. Typical examples are concretes and drill holes in rocks. The instruments can be used in:
- Tunnel supports
- Deformations of pillars
- Dams and nuclear power plants
- Structural members of buildings and bridges
- Piles and caissons
- Movements and landslides
The sensor detects the compression of a metal body. This metal body is in a two components resin and protected housing. The housing is arranged in concrete or in the iron reinforcement braid. Compression is measured by an ultrasonic pulse echo method. In the case of concrete tension sensor, an ultrasonic sensor is included. The RSS-X comes in two models, RSS-X and RSS- 2X, that differ in their measured axis. RSS-2 X two systems owned by 90° turned. The horizontal and vertical stress is measured.
The sensors with Triaxial accelerometer with magnetometer (compass) or without can be equipped. Therefore, the alignment of the bore hole and the position of the sensor for crimping the expansion of cement can be determined.
The runtime in the measuring element is measured in high resolution with a separate stress meter. All ultrasound devices to the bolt measurement with a maximum frequency of 10 MHz is suitable for the measurement. The term declines linearly with the compression in the elastic range. The compressive stress sensor surrounding concrete is a compression of the measuring element. The change in the length of the measuring element is dependent on the load or stress, and on the temperature. Both factors are taken into account for the ultrasound measuring device to measure a change in length
A permanent temperature sensor is integrated into the pressure-voltage sensor. This temperature sensor work as 1-wire sensor with ROM for identification. For universal use, the sensor for all devices for the measurement of bolts is suitable regardless of its manufacturer. The automatic temperature correction of these devices can be used. A second is incorporated independent temperature sensor. The term, due to the change in length and acousto elastical effect, reduces the influence of the surrounding concrete on the measuring element.
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