Acronym:

Sonda s rotirajućim magnetskim poljem za nerazornu kontrolu sigurnosno kritičnih komponenti industrijskih postrojenja 

From: 2016-06-01 To: 2017-05-31 (Completed)

BICRO 

PoC 

- 

doc. dr. sc. Darko Vasić

- 

Pipes made of conductive and ferromagnetic materials (copper, steel) are one of the most safety critical components of the industrial systems (e.g. gas pipelines, oil wells, heat exchangers in nuclear reactors). Pipes are subjected to the mechanical and chemical wear, and frequent non-destructive testing (NDT) is required in order to ensure proper system's functioning and safety to personnel and environment. Very important NDT method is an electromagnetic method of detecting wear based on its effect on the induced eddy currents within the material. Eddy current method usually employs coils as generators (transmitters) and sensors (receivers) of the magnetic field. This results in a robust construction suitable for operation in harsh environment (high temperature, pressure and stress) regardless to the pipe content (oil, steam, mud and other fluids or materials). The basic eddy current probe is sensitive only to the internal defects oriented along the tube. More complicated construction and excitation allow one to detect loss of material (e.g. corrosion) from the external side of the tube wall. Signals obtained from the probe represent circumferentially averaged loss of material and they require an experienced operator in order to identify different defect types. The most advanced eddy current probes employ several transmitters and receivers positioned along the tube internal circumference or mechanically rotating transmitters. This results in the image of the tube interior wall. Such an approach considerably complicates the probe construction, increases the number of measurement channels and wiring, and complicates the excitation and data acquisition circuitry. This reduces the reliability and increases the cost and duration of the testing. The result of this project is a prototype and demonstration of its technical feasibility of an eddy current probe with an innovative construction of the transmitter and excitation that will generate the rotating magnetic field inside the tube. This approach will provide a 3D image of the tube wall without any mechanically moving parts and with the minimal number of the inductive sensors, thus significantly simplifying the construction and robustness in comparison to the mechanically rotating probes.