| 摘要 |
<p>The invention relates to a method and an apparatus for examining bodies by means of penetrating radiation, wherein the body is irradiated with a beam of rays which is emitted by a radiation source and which is detected by a radiation detector and converted into electrical signals, wherein the signals are processed in a digital computer in order to produce a three-dimensional reconstruction of the density distribution of the examined body, and wherein the source and the detector carry out a substantially helical movement relative to the body, wherein: the source and the detector are both stationary; the body is moved; the source emits a conical radiation beam; and the detector extends in two directions of the same dimension. The method is particularly suitable for examining bodies of material with a density greater than 2000 kg/m3, for instance a turbine blade.</p> |
