A crack can be detected by observing the temperature distribution and the heat flow over time. Whether or not the crack can actually be recognized with visual methods is irrelevant. Important however is the detection of a significantly affected heat transfer, caused by a crack in the material.

There are different thermographic methods for crack detection and are explaind in the application examples:

  • Laser induced crack detection
  • heat induction by focused light
  • Electromagnetic induction
  • use of already existant heat from production process

Different to visual inspection, thermographic methods also evaluate the change over time of the thermal signals. Especially in industrial environments, noise from reflections and inhomogeneous surface properties superpose the desired signal. Sophisticated time series analysis enables the suppression of such noise and allows us to have a robust and stable signal to identify defects.

Application flieds:

Crack detection for contineously moving parts

Steel-billets can be checked for cracks automatically at transportation velocities of up to 1.5m/s by inductive excitation. A coil induces an electrical current with high frequency in the region close to the surface of the billet. If there is a crack located in the path of the electrical c...

Crack detection in production cycle

In a cyclic production line, crack checking can be done by laser heating and heat-flux evaluation. If the specimen doesn’t move, a pattern of laser points is heating up a surface area simultaneously, while a thermal camera records distribution and evolution of the surface temperature. Ev...

Crack detection on a conveyor belt

The specimen is transported by a conveyor belt, passing an array or Xenon-spots, which act as a heat source. An array of heated lines, distributing their heat to each side is the result. If there is a crack located in the path of the distributing heat, a discontinuity in the temperature pr...

Crack detection with robots

In case of specimen with a more complex geometry, a robot is used to handle such parts, and to scan the surface for cracks. Based on the CAD-data, the controlling unit calculates an optimal path, which is then implemented by the robot to check the entire area. The evaluation unit sends the...

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