PTvis System

Laboratory NDT systems for pulse thermography

Pulse thermography is a non-contact testing method that is ideally suited for the non-contact characterisation of thin layers or coatings / lacquers and delaminations. The very short test duration and the high detection sensitivity make pulse thermography an extremely powerful tool in non-destructive materials testing. The pulse-phase evaluation technique allows the quantitative determination of material properties such as thickness, porosity or thermal conductivity. In addition, disturbances such as varying surface properties or uneven heating are suppressed. The interpretation and documentation of test results is very simple. The PTvis system, which is based on high-power flash lamps, has a modular design and can be expanded with further types of excitation (UTvis, ITvis, OTvis…).

PTvis principle - flash thermography

Principle of pulse thermography

The surface of the examined object is heated strongly for a short time with flash lamps. In pulse thermography, the heat flow caused by the short flash plays an essential role. Thermal obstacles (e.g. thickness variations or material defects) change the heat flow. Temperature differences form on the surface, which are recorded with a high-speed infrared camera. The sensitivity of the method can be further increased with pulse-phase technology. Here, the intensity curve of the surface temperature is spectrally analysed by means of the Fourier transformation and decomposed into a phase and amplitude image. With the help of calibrations, the phase image allows quantitative statements to be made about certain material properties.


Analysis of the growth of corrosion under paint with impulse thermography during weathering tests after (left to right): 1 week, 2 weeks, 3 weeks, 4 weeks of weathering.
  • Coating thickness testing and paint thickness measurement
  • Non-destructive surface testing
  • Detection of corrosion under paints, detection of filiform corrosion.
  • Testing of layers and coatings, bonding test
  • CFRP / other fibre composites (delaminations, impacts, inclusions and porosity, bonding of inserts, resin/fibre content, preform analysis…)
  • Wall thickness measurements
  • Testing of bonded joints
  • Weld seam inspection
Characterisation of lacquer thickness (clear lacquer on wood). Left: Pulse thermography phase image. Right: Photo.

PTvis Software

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The comprehensive acquisition and evaluation software with project tree and script interface, modularly expandable with all further excitation modules.
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Technical Data

Flash generatorPTvis 3000PTvis 6000PTvis 12000
Flash energy3 kJ6 kJ12 kJ
Power supply230 V / 16 A23 0V / 16 A230 V / 16 A
Output channels1x 3 kJ1x 6 kJ or 2x 3 kJ2x 6 kJ or 4x 3 kJ
Housingcompact housing19” unit with 6 HU
or stand alone unit
19” unit with 12 HU
or stand alone unit
Real time synchronizationyesyesyes
Suitable for continuous operationnoyesyes
Connector for standard flash lampsyesyesyes
Connector for linear flash lampsnoyesyes
Dimensions34.5 x 19.5 x 28.5 cm19″, 6 HU, 475 mm depth19″, 12 HU, 475 mm depth
Weight9 kg29 kg58 kg

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