Scanning laser x-ray positioner

FIELD: radiator positioning to object.

SUBSTANCE: newly introduced in proposed laser positioner are beam splitter disposed on laser axis between first reflector and first butt-end of laser at angle of 45 deg. to it axis, as well as third reflector disposed on axis drawn between point of intersection of beam splitter reflecting surface and laser axis perpendicular to this axis; beam splitter and third reflector are rigidly intercoupled and mounted on revolving flange whose axis is aligned with laser axis; it is set in rotary motion by means of motor drive, for instance that of frictional type, at frequency f ≥ 10 Hz mounted on positioner housing; reflecting surface of third reflector is tilted through angle β = 45° + α/4 to laser axis, where α is X-ray radiator angle of radiation; distance C between centers of beam splitter and third reflector is correlated with distance B along laser axis from center of first reflector to that of beam splitter by equation C=(A-B)·tg(α/2), where A is distance from X-ray radiator focus to first reflector center. This positioner incorporates provision for estimating X-rayed area of object and also for determining center of this area.

EFFECT: enlarged functional capabilities and facilitated determination of radiator-to-object distance.

1 cl, 1 dwg

 

The invention relates to non-destructive testing using x-ray radiation and can be used for control of materials and products radiation method in various engineering industries.

Known laser centralizer, comprising a housing located therein a laser with two-sided output radiation, the optical axis of the output radiation which is parallel to the longitudinal axis of the x-ray emitter, two reflector, the first of which, made of plexiglass, installed at the intersection of the optical axis of the laser with the axis of the x-ray beam emitter can be rotated around an axis perpendicular to the plane defined by the optical axis of the output laser radiation with the axis of the x-ray beam, in the angle range 25-65°and the second set can be rotated around an axis parallel to the axis of rotation of the first reflector, the optical axis of the output radiation outside the projection on her exit window of the x-ray emitter, means for indicating the focal length in the form of a pointer with a scale attached to the body of the centralizer associated with the second reflector, and means interrupting the beam from the second reflector, made in the form of hinged shutters installed before or after the second reflector [1].

This device does not allow to estimate the size of the x-ray beam in the plane of the of men and in addition, it has reduced the accuracy of the measurement of the focal length due to difficulties with the combination of small points of light, poorly distinguishable by large distances to the object.

Also known laser centralizer, comprising a housing located therein a laser with two-sided output radiation, the optical axis of which is parallel to the longitudinal axis of the x-ray emitter, two reflector, the first of which was installed at the intersection of the optical axis of the laser with the axis of the x-ray beam, and the second set on the optical axis of the output laser radiation outside the projection on it of the output window of the x-ray emitter with the possibility of rotation around the axis perpendicular to the plane defined by the optical axis of the output laser radiation with the axis of the x-ray beam, and means for indicating the focal length in the form of a pointer with a scale attached to the casing centralizer, further provided with two cylindrical lenses mounted on the axis of the laser radiation, across each of the output beam, the first between one of the end faces of the laser oscillator and the first reflector, the second between the second end of the laser emitter and the second reflector, and their focus is chosen from the relation f=h/tgαwhere h is the radius of the laser beam, α - the angle of radiation of the x-ray emitter, with cylindrical is INSY mounted for rotation around the axis of the laser beam [2].

The disadvantage of this centralizer is the inability to evaluate the area of the object irradiated by x-rays, as well as the complexity of determining the center of this area and determine the distance from the x-ray emitter to the object in connection with the necessity of rotation of the cylindrical lenses.

To address these shortcomings in the laser centralizer, comprising a housing located therein a laser with two-sided output radiation, the optical axis of which is parallel to the longitudinal axis of the x-ray emitter, two reflector, the first of which was installed at the intersection of the optical axis of the laser with the axis of the x-ray beam, and the second set on the optical axis of the output laser radiation outside the projection on it of the output window of the x-ray emitter with the possibility of rotation around the axis perpendicular to the plane defined by the optical axis of the output radiation of the laser and the axis of the x-ray beam, and means for indicating the focal length in the form of a pointer with a scale attached to the casing centralizer, cylindrical the lens mounted on the axis of the laser across its output beam, between the second end of the laser emitter and the second reflector, the focus of which is selected from the relation f=h/tgαwhere h is the radius of the laser beam, α - the angle of radiation of the x-ray emitter, with a cylindrical lens is mounted for rotation around the axis of the laser beam, additionally there is a beam splitter located on the axis of the laser between the first reflector and the first end of the laser at an angle of 45° to its axis, a third reflector located on an axis drawn from the point of intersection of the reflecting surface of the beam splitter with the axis of the laser perpendicular to this axis, the beam splitter and the third reflector rigidly interconnected and mounted on a rotating flange, the axis of which coincides with the axis of the laser and which is driven with a drive, for example, a friction-type, rotating with frequency f≥10 Hz with an electric motor mounted on the casing centralizer, while reflecting surface of the third reflector inclined at an angle β=45°+α/4 to the axis of the laser, where α - the angle of radiation of the x-ray emitter, and the distance between the centers of the beam splitter and the third reflector is associated with the distance along the axis of the laser from the center of the first reflector to the center of the beam splitter ratio C=(A-B)·tg(α/2), where a is the distance from the focus of the x-ray emitter to the center of the first reflector.

The invention is illustrated by the drawing, which shows a diagram of the device.

Laser centralizer contains the x-ray radiator 1, to which is attached the housing 2 located therein by laser 3 with bilateral output radiation, the optical axis of the output radiation is s which is parallel to the longitudinal axis of the x-ray emitter, two reflector 4 and 5, the first (4) of which, made of plexiglass, installed at the intersection of the optical axis of the laser 8 with the axis of the x-ray beam 7 of the radiator (falling on controlled surface 6) can be rotated around an axis perpendicular to the plane defined by the optical axis 8 of the output radiation of the laser and the axis 7 of the x-ray beam in the angle range 25-65°and the second (5) mounted to rotate around an axis parallel to the axis of rotation of the first reflector on the optical axis 9 of the output radiation outside the projection on it of the output window of the x-ray emitter, the indication of the focal length as a pointer 10 scale 11, fixed to the body 2 of the centralizer associated with the second reflector 5, and a means of interrupting the beam from the second reflector 5 made in the form of hinged shutters installed before or after the second reflector.

The centralizer includes a cylindrical lens 12, which is installed on the optical axis of the laser beam between the end face of the laser and the reflector 5 so that the object 6 is formed a vertical luminescent band. The beam splitter 13 and is rigidly associated with the third reflector 14 mounted on an axis perpendicular to the axis of the laser, at a distance from each other, with the center of the beam splitter, i.e. the point of intersection of the reflective surface with the axis of the laser is located at a distance from the point of intersection of the axis of the x-ray beam with the reflecting surface of the first reflector 4. The reflective surface of the beam splitter is inclined to the axis of the laser on the 45°and the reflective surface of the third reflector inclined to the axis of the laser at an angle of 45°+α/4.

The device operates as follows.

The laser beam emerging from the first end of the laser 3, after passing through the beam splitter 13 is divided into two. One extends along the optical axis of the laser and after reflection from the first reflector forms on the surface of the object 6 bright spot coincident with the point of intersection of the object with the axis of the x-ray beam.

The second beam is directed to rigidly associated with the beam splitter 13, the third reflector 14 and after reflection from it is directed to the first reflector 4, and then on the object 6. Because of the law of specular reflection after reflection from the third reflector, the reflecting surface of which is inclined at an angle β=45°+α/4, this beam is directed onto the first reflector 4 at an angle α/2 equal to half the angle of radiation of the x-ray emitter.

Indeed, when the deviation of the normals to the third reflector at an angle α/4 relative to the direction normal to the reflecting surface of the beam splitter 13, the beam is reflected from it, is deflected twice the value of this angle, i.e. the angle α/2 [3].

In this case the normal to the reflecting surfaces of the beam splitter 13 and the third reflector 14. the juxtaposed in the same plane.

During the rotation of the beam splitter 13 and is rigidly associated with the third reflector 14 with respect to an axis of the laser beam reflected from the third reflector 14, describes in space a conical surface with an angle of solution equal to the angle of radiation α x-ray emitter. The apex of this cone is at a distance from A center of the first reflector is equal to the distance from the center to focus x-ray tube of the radiator 1, which is ensured by selection of the values of a, b and C according to the obvious value of C=(A-B)·tg(α/2). Because of this hollow cone of laser beams formed in the joint rotation of the beam splitter 13 and the third reflector 14, creates on the surface of the object 6 luminescent ring, the diameter of which is equal to the diameter of the zone of irradiated x-rays and the center of this ring coincides with the point of intersection of the object with the axis of the x-ray beam.

The frequency of rotation of the beam splitter and is rigidly associated with the third reflector is selected from the conditions for obtaining a combined image of a luminous ring with regard to the constant rotation of view, equal to 0.1 [3].

The laser beam emanating from the second end of the laser is converted by the cylindrical lens 12 in a plane diverging radiation flux that creates on the object surface 6 a luminous strip, which moves over the object parallel to the SEB is during the rotation of the second reflector 5.

In the process control operator combines laser spot in the center of the luminous ring with center subject to scanning area of the object and evaluate the compliance of the diameter of the luminous ring to the desired size of the control zone. If necessary, change the size of the zone of radiographic change the distance from the transmitter to the object. Then the rotation of the second reflector combine laser stripes formed on the object by a cylindrical lens, the laser spot in the center of the luminous ring, measure the distance from the object to the x-ray emitter using a scale with a pointer and start the procedure of scanning of the object.

Literature

1. Patent of Russia 1798935. Laser centralizer.

2. Patent of Russia 2106619. Laser centralizer for x-ray emitter.

3. The reference design opto-mechanical devices, edited Vaganova. M: Engineering. 1980. 742 S.

Laser centralizer, comprising a housing located therein a laser with two-sided output radiation, the optical axis of which is parallel to the longitudinal axis of the x-ray emitter, two reflector, the first of which was installed at the intersection of the optical axis of the laser with the axis of the x-ray beam, and the second set on the optical axis of the output laser radiation outside the projection on it of the output window of the x-ray emitter with a capacity which allows rotation around an axis, perpendicular to the plane defined by the optical axis of the output radiation of the laser and the axis of the x-ray beam, and means for indicating the focal length in the form of a pointer with a scale attached to the casing centralizer, a cylindrical lens mounted on the axis of radiation of the laser across its output beam between the second end of the laser emitter and the second reflector, the focus of which is selected from the relation f=h/tgαwhere h is the radius of the laser beam, α - the angle of radiation of the x-ray emitter, with a cylindrical lens mounted for rotation around the axis of the laser beam, characterized in that it further introduced a beam splitter located on the axis of the laser between the first reflector and the first end of the laser at an angle of 45° to its axis, a third reflector located on an axis drawn from the point of intersection of the reflecting surface of the beam splitter with the axis of the laser perpendicular to this axis, the beam splitter and the third reflector rigidly interconnected and mounted on a rotating flange, the axis of which coincides with the axis of the laser and which is driven with a drive, for example, a friction-type, rotating with frequency f≥10 Hz with an electric motor attached to the housing clamp, while the reflective surface of the third reflector inclined at an angle β =45°+α/4 to the axis of the laser, where α - the angle of radiation of the x-ray emitter, and the distance between the centers of the beam splitter and the third reflector is associated with the distance along the axis of the laser from the center of the first reflector to the center of the beam splitter ratio C=(A-B)·tg(α/2), where a is the distance from the focus of the x-ray emitter to the center of the first reflector.



 

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