Dynamic Load Inspection on Steel Tendons of Steel Reinforced Concrete Constructions by means of Eddy-Current Sensors

摘要

In this contribution a force measurement system will be represented. It applies the method of eddy-current sensor testing. This measurement arrangement is able to detect dynamic tensile loads in prestressings, which are higher then 5 MPa and oscillating up to 20 Hz. Fast measurement rates and low power consumption are the main efforts of the eddy-current sensor system. Developed sensor-arrays can easily be mounted by a special clamp-on technique. Slight steel contact inaccuracies while fixing the sensor-array will be minimised by applying the sensor fusion principle. Operation point stabilisation and calibration has been archived by an adjustable radial magnet field offset over the whole measuring area. A theoretical approach and detailed modelling by finite element methods of the eddy-current sensor in a measurement environment helps to verify the function of the whole system.