Thermography is a method of non-contact detection and evaluation of thermal radiation invisible to the human eye, the so-called infrared radiation, of an object or body. Thermography is used in research, manufacturing, production preparation, acceptance and preventive maintenance.
The component is irradiated with infrared rays and thus the internal thermal conductivity properties of the component can be made visible. The infrared image changes due to inhomogeneities or cracks and the defect can be seen on the thermographic image.
Passive thermography enables the acquisition, comparison and measurement of an actual thermal condition without additional excitation sources. It covers the areas of machine diagnostics, electrical thermography, building thermography and plant thermography.
In active thermography, a heat flow is excited in the test object. This makes defects in the component visible.
Thermography is a non-contact, imaging and therefore very fast NDT method with which even complex geometries can be inspected with little effort.