Patent ID: 8228488

Claim:
A measuring apparatus for determining the material strength of an object, comprising: a first distance measurer including a first light-slit measurer arranged to determine a first distance profile between the first light-slit measurer and a first main surface of the object facing the first light-slit measurer in a measurement direction along a first measuring light strip on the first main surface of the object extending in a light strip direction; a second distance measurer including a second light-slit measurer arranged to determine a second distance profile between the second light-slit measurer and a second main surface of the object opposing the first main surface of the object in the measurement direction along a second measuring light strip on the second main surface of the object extending in the light strip direction; a first X-ray unit arranged in a spatially stationary orientation and a known geometrical position with regard to the first and the second light-slit measurers to infer a first material strength of the object along a first X-ray direction from an attenuation of X-ray radiation caused by the object along the first X-ray direction; a second X-ray unit connected to the first and the second light-slit measurers and arranged in a further spatially stationary orientation, spatially separated from the first X-ray unit along the light strip direction, to infer a second material strength of the object along a second X-ray direction from an attenuation of X-ray radiation caused by the object along the second X-ray direction; and an evaluator arranged to determine the material strength of the object between the first main surface and the second main surface by using the first distance profile, the second distance profile, and the first material strength, wherein the evaluator is implemented to infer a tilting between the first and the second light-slit measurers in a plane spanned by the light strip direction and the measuring direction from the first and second material strengths.