Device for determination of inner surface contour of object

FIELD: determination of inner surface contour.

SUBSTANCE: the device has a laser, reflectors symmetrically installed on the scanner assembly provided with means for angular scanning of the reflectors relative to the axis of the mentioned assembly, and receiver of the laser beam reflected from the object surface. The scanner assembly is made in the form of a motor, whose shaft is coupled to the reflectors; the means for angular scanning relative to the axis of the scanner assembly are made in the form of a solenoid installed in the axis of the motor shaft, a laser beam splitter is positioned between the laser and deflectors.

EFFECT: enhanced accuracy and efficiency of contour measurement.

1 dwg

 

The invention relates to measurement devices, namely, devices for determining the surface profile using laser radiation.

A device for measuring parameters of the internal surface of the pipeline, using the triangulation principle and comprising a radiation source, the deflecting mirror and the detector. The plane mirror makes with the optical axis of the source angle 45°and the axis of rotation of the mirror coincides with the optical axis of the source (1). Generated by the source of the probing light beam hits the mirror, which deflects it to the surface of the pipeline. The reflected beam hits the mirror and is reflected from it, is registered by the detector. The rotation of the mirror allows the scanning of the probe beam and to obtain information about the surface profile of the pipeline in this section. Moving the radiation source along the axis of the pipeline, you can define parameters of the internal surface of the pipeline (diameter, topology).

Known electron-optical system for determining the profile that contains the laser light source, a mirror equipped with stepper motors connected to the computer to rotate the mirror in two mutually orthogonal planes, and the photodetector reflected from the measured surface of the laser beam (2).

Known usteristrasse as follows. Produced by the laser source beam is directed to mirror that rotates in two planes, projecting it on the surface to be measured. Reflected from the surface of the beam goes to the mirror and recorded by a photodetector. The measured value is determined by the angle of rotation of the stepper motor.

A disadvantage of the known device is the following.

Use as a means of moving mirrors stepper motors, even with relatively high precision step - 3 mrad at one pulse generated by the computer, causes the at large distances between the mirror and diagnosed by the surface to the measuring error, which cannot be neglected. Use one of the probing beam on the surface of the object and the "point" of a sensor significantly reduces the speed of measurement.

In addition, when registering the reflected beam through the "point" of a sensor potential measurement error associated with the care of the elements of the measuring system, for example, mirrors, or the measured object from the specified position.

As a prototype of the proposed technical solution selected device for determining the profile of the inner surface of the cylindrical object configuration that includes a base on which the common axis coinciding with the axis of the object, has two laser and R is polozhenie in front of them cone-shaped reflectors, provided with means to rotate 360°, means for moving the platform along the axis of the object and the receiver is reflected from the measured surface of the reflected beam, made the camera view (3).

The known device operates as follows. Lasers emit in opposite directions rays lying in the same plane and incident on the cone-shaped reflectors that direct rays on the surface to be measured of the object, resulting in the rays intersect the surface at one point. The fall of the two beams on the surface of the object from different angles helps to better identify the topology of the surface and, thereby, increase the accuracy of measurement of its profile.

The rotation of the reflectors provides the movement of the rays on the object surface in the radial direction and forming a scan line. The reflected signal is recorded by the video camera.

A disadvantage of the known device is the fixed position of the conical reflectors on the horizontal axis of the object and, accordingly, the fixed angle of incidence of the laser beams on the surface to be measured, which does not allow for high precision measurement of surface profile characterized by a developed microtopology, as in this case, you want to direct the probe beams on the surface of the object from different angles.

Chrome is also the time required for the formation of scanning lines is determined by the turns of the reflector 360°. This reduces the efficiency of the measurements.

The problem solved by the invention is improving the accuracy and efficiency of measurement of the profile of the inner surface of the object.

This task is solved in that the device for determining the profile of the inner surface of the object, including the laser reflectors associated with the rotation mechanism, and the receiver is reflected from the surface of the object laser beam between the laser and the reflector is a beam splitter laser beam, and the reflector is made in the form of two mirror-symmetrically installed on the rotation mechanism, provided with means for angular scanning mirror about an axis of the above-mentioned mechanism.

The invention is illustrated in the drawing, which depicts the inventive device.

Device for determining the profile of the inner surface of the object includes a laser 1, the beam splitter laser beam containing a semi-transparent mirror 2 and guides the mirrors 3, 4, 5; working mirrors 6 and 7, mounted symmetrically on the rotation mechanism, made in the form of the engine 8, which shaft is connected with the mirrors 6 and 7. Tools of the angular displacement of the mirror along the Z-axis of the mechanism of rotation coincident with the direction of propagation of the beam generated by the laser 1, implemented in the run as installed on the axis of the shaft 8 solenoid 9. The receiver 10 reflected from the object surface 11 of the laser radiation is performed, for example, in the form of photolyase of charge-coupled devices.

The device operates as follows. Laser 1 produces a collimated beam of light that falls on the semi-transparent mirror 2. Part of the laser radiation reflected from the mirror 2 and through the mirror 3 is directed to the working mirror 7; the remaining part of the radiation through the mirrors 4 and 5 is directed to the working mirror 6. Falling on the surface of the mirrors 6 and 7 at equal angles of the rays are reflected from them and formed on the object surface 11 of the probe spot of small diameter lying in the plane perpendicular to the z-axis By means of the motor 8 is simultaneous rotation of the mirrors 6 and 7 180° and, accordingly, the scanning beams on the surface of the object 11. The image of a closed circular line is projected on the surface of the receiver 10. For measuring the profile of a certain area as locally in the vicinity of the sensed point and at a greater distance through the solenoid 9 is the angle of inclination of the mirrors 6 and 7 relative to the axis Z. This leads to the change of the angles of inclination of the probe beams relative to the surface of the object and allows higher-precision measurement of the s microtopology.

The use of two mirrors allows to form a scan line for a time interval equal to 1/2T, where T is the time complete rotation of the mirror about its axis, which is considerably lower than the time required for the formation of scanning lines in the device prototype.

Thus, compared with the device - the prototype of the proposed device for measuring the profile of the inner surface of the object has a higher accuracy and efficiency measurements.

LITERATURE

1. the Federal Republic of Germany patent No. 4206608, CL G 01 B 11/12, 1993

2. U.S. patent No. 4300836, CL/376, 1981

3. Patent of great Britain No. 2094470, CL G 01 B 11/24, 1981 (prototype).

Device for determining the profile of the inner surface of the object, including the laser reflectors symmetrically installed on the rotation mechanism, provided with means for angular scanning of the reflectors relative to the axis of the above-mentioned mechanism, the receiver is reflected from the surface of the object laser beam, wherein the rotation mechanism is made in the form of the engine, the shaft of which is connected with reflectors; means the angular scanning of the reflectors relative to the axis of the rotation mechanism made in the form of a solenoid mounted on the axis of the motor shaft, and between the laser and the reflector is a beam splitter laser beam.



 

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