Patent ID: 11954848
Assignee: TIAMA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A method for automatically measuring linear dimensions of manufactured objects (2) of a series comprising:
the choice of a series of manufactured objects (2) in which each of said objects consists of one or several distinct parts, the number of parts being known and each part being made of a material with a known attenuation coefficient which is uniform at every point of the part of the object;
the transport, by means of a transport device, of the objects in a direction of displacement (T) along a rectilinear trajectory in a conveying plane (PC), these objects generating a conveying volume (Vt) during their displacement;
the disposition, outside the conveying volume (Vt),
of at least one focal point (Fj) of an X-ray generating tube, each focal point being arranged on a same base straight line parallel to the direction of displacement (T) along the rectilinear trajectory and
of one or several image sensors (Ci) each exposed and sensitive to X-rays derived from an associated focal point (Fj), these X-rays having passed through at least the region to be inspected producing on each image sensor a radiographic projection of the region to be inspected along a direction of projection (Dji, Djik);

the acquisition, using the image sensor(s) (Ci, Cik), for each object during its displacement, of a set of one-dimensional processing radiographic images, each one-dimensional processing radiographic image comprising a projection of a section of the object along a section plane (Pk) containing the base straight line, the set comprising:
said one-dimensional processing radiographic images for a number (NK) of distinct section planes (Pk) containing the base straight line;
for each distinct section plane (Pk), a number (NP) of said one-dimensional processing radiographic images (Spk) of the region to be inspected, obtained along at least three different directions of projection (Dijk) in the section plane;

for each object to be measured, and for each distinct section plane (Pk), the determination, using the computer system, of a delineation of the object in the considered section plane (Pk), from the one-dimensional processing radiographic images (Spk) of the region to be inspected, obtained along the at least three different directions of projection (Dijk) in the section plane,
and the determination, for an object to be measured, from the delineations of the object in each distinct section plane, of at least one measurement of the linear dimension of the region to be inspected of the object to be measured.