Patent ID: 8766193

Claim:
A device for the contactless and non-destructive testing of a test surface by measuring the infrared radiation thereof, comprising: one or more incoherent electromagnetic radiation sources; a detector providing and arranged on a detection axis and comprising a measuring area; a testing area defining an area to be measured of the test surface; and an imaging device arranged on the detection axis for mapping the testing area onto the measuring area of the detector, wherein the radiation sources are arranged at a radial distance from the detection axis at a distance from the testing area, wherein these radiation sources are adapted to generate a pulse-like or intensity-modulated excitation radiation which can be directed onto the surface to be tested in the testing area, wherein, in response to radiation impinging onto the surface to be tested in the testing area, detection radiation is emitted by the measuring area of the surface to be tested and fed to the detector, wherein the excitation radiation from the radiation sources is fed to the testing area at an inclination to the detection axis, wherein the detector on the detection axis is arranged spatially further away from the testing area than the radiation sources, wherein the imaging device is arranged between the radiation sources, and wherein a reflection device is provided which comprises reflection surfaces that comprise a truncated-cone-shaped structure which comprises an opening narrowing towards the testing area and determining the testing area.