LASER CENTRALISER FOR X-RAY EMITTER Russian patent published in 2011 - IPC H05G1/00 

FIELD: physics.

SUBSTANCE: invention relates to a laser centraliser for an X-ray emitter, having a housing in which there is a laser range finder, the laser axis of which is parallel to the longitudinal axis of the X-ray emitter, two mirrors, the first of which is made from organic glass and is placed at the intersection of the axes of the laser and X-ray beams perpendicular the plane which they form at an angle of 45 degrees to the axis of the laser, and the second mirror lies on the axis of the laser at an angle to 45 degrees to the axis of the laser, wherein its centre lies at a distance A from the centre of the first mirror, which is equal to the distance from it to the focal point of the X-ray tube on the axis of the X-ray beam, a television system consisting of an objective lens, a CCD matrix and a monitor, wherein the optical axis of the objective lens passes through the centre of the second mirror and coincides with the perpendicular passing from that centre to the axis of the laser, in front of the objective lens there is a light filter for increasing contrast of images of laser structures on the objective lens, and on the axis of the range finder laser perpendicular and symmetrically about it at a distance B from the centre of the second mirror there is a an annular structure of microlasers the number of which is N>8, optical axes of which are inclined to the axis of the range finder laser at angles a/2 in planes formed by axes of the microlasers and the axis of the laser and which, after reflection from the first mirror, form on the object an image of the annular structures of laser spots, the size and shape of which correspond to the size and shape of areas illuminated by X-rays, the axis of the range finder laser after reflection from the first mirror coincides with the axis of the X-ray beam and forms on the object a laser spot which coincides with the intersection point of the axis of the X-ray beam with the object and with the centre of the annular structure of the laser spots formed by the annular array of microlasers, the second mirror has a centre opening for passage of the beam of the laser range finder, the annular array of microlasers with diameter D is placed from the centre of the second mirror at a distance B=D/tg(a/2), where a is the divergence angle of the X-ray beam, the centraliser also includes a rectangular array of microlasers with dimensions K*T, where K and T are dimensions of the radiographic film in the radiographic holder, this array lies on the housing of the centraliser symmetrically about the axis of the X-ray beam, optical axes of the microlasers whose number M≥8 are parallel each other and the axis of the X-ray beam and form on the object a rectangular structure of laser spots with dimensions K*T, which do not change when the distance from the object to the centraliser D changes and through which the ratio of dimensions of the area of the object illuminated with X-rays and the real area for recording radiographic images, defined by dimensions of the radiographic film used, is determined, wherein for better distinction of that and the annular structure of the laser spots, radiation of microlasers which form a rectangular structure, may be modulated with frequency f>=1-10 Hz.

EFFECT: avoiding faults due to spurious light flares on the surface of the semiconductor mirror, possibility of estimating the ratio of dimensions of the area illuminated with X-rays and the holder of the film used.

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