NON-DESTRUCTIVE TESTING – WITH ELECTROMAGNETIC ULTRASOUND
Street lamps need to withstand many strains and stresses over as long a period as possible. Wind, weather, salts and aggressive soil properties, or creeping currents afflict the materials over the long term. The masts in particular, which extend into the soil, are at risk from threats such as corrosion. However, corrosion is not visible to the naked eye at those points.
We have developed our Lima testing system in collaboration with the Fraunhofer Institute for Non-Destructive Testing – IZfP in Saarbrücken. The system surveys the entire cross section of the mast with electromagnetic ultrasound, which expands over larger distances – in our case, along the lamp mast tubing. Traditional ultrasound devices are only able to measure wall thicknesses directly behind the ultrasonic test head.
With our Lima test, the specially developed test heads are arranged so that the electromagnetic ultrasound wave transmits an accurate profile of the material thickness and its weak points (corrosion).
The University of Applied Sciences (HTW) is another partner in the field of safety. The HTW has developed the EDUSTA software. Based on the applicable norms and the test results, it calculates a statics value for the mast and sets the date for the next test.