LASER CENTRATOR FOR X-RAY EMITTER Russian patent published in 2011 - IPC H05G1/02 

FIELD: machine building.

SUBSTANCE: here is disclosed laser centrator consisting of centrator with enclosed in it laser. Optical axis of the laser is parallel to lengthwise axis of X-ray emitter. Further, the centrator consists of two deflectors. The first deflector is positioned on crossing point of laser axes and X-ray beam, while the second one is located on laser axis before its emitting end between it and the first deflector at distance H from the centre of the first deflector. This distance H is equal to distance from the centre to focus of an X-ray tube along axis of X-ray beam. A spherical lens is arranged before the emitting end of the laser and the second deflector. It forms a conic laser beam, geometrical parametres of which are identical to parametres of the X-ray beam. Perpendicularity of object surface to axis of X-ray beam is evaluated by degree of ellipticity of a light disk formed with the beam. Optical axis of lens of TV-camera coincides with axis traced from the centre of the second deflector perpendicular to axis of the laser and to a measuring scale for quantitative evaluation of defect dimensions on surface of an object and its perpendicularity to a beam of X-ray radiation. There are additionally introduced a computer and a laser range finder mounted on the case of the centrator beyond a zone of X-ray beam. Optical axis of the range finder is parallel to axis of the X-ray beam, while its digital output is conjugated with an input of the computer. The second deflector has a central orifice D=Dl transmitting the laser beam, where Dl is diametre of this beam. The computer automatically calculates a current value of C - a division value in plane of a scale object - shown on a screen of a display or generated with software, by ratio C=Co/M, where M is general magnification, Co is a division value of the scale of the screen of the display, M=MtxMo, where Mt=B/A is television magnification, A and B are dimensions of raster of a CCD-matrix and display correspondingly, Mo=F/L is optical magnification, where F is focus distance of TV-camera lens, and L is current distance from the object to the centrator.

EFFECT: avoiding both subjectivity in procedure for measuring distance to object and uncertainty of division value of scale on monitor screen depending on distance from object to centrator and corresponding to it value of scale of optical image.

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