Mode of contactless scanning of the form of outer contour of curved surface

FIELD: the invention refers to using of a laser emitter for scanning curved surfaces.

SUBSTANCE: a light of beam from a laser emitter is directed on the scanned surface. The forming of conical light surface is made by rotating of laser emitter for making on the scanned surface an image in the shape of a ring and the form of the surfaces is determined by shifting the ring along the surface with interpolation of points' height which are determined according to stated correlation.

EFFECT: scanning of long-length and large dimension surfaces.

2 dwg

 

The invention relates to the field of scanning the shape of the surfaces, namely curved surfaces used to create forms in aircraft construction, shipbuilding, automotive, etc.

A known method lies in the fact that the glass is exposed to a beam of light and the offset passed through the glass of the light beam determine the thickness of glass, characterized in that the light beam is formed as a conical surface, additionally sent to the second glass, the same light beam coaxially with the first, with a convergence angle that is different from the first, forming a first converging geocentricity the light beam, the diameter of the light rings formed in the recording plane, located at a point of convergence of the beams perpendicular to their axis, determine the thickness and refractive index, the offset of the axis of the beam determine the clinoid shape of the glass, local distortions of the rings assess the deviation of a surface from the plane. The application for the invention 98101184/28, 6 G 01 B 21/08 from 09.01.1998. However, this method cannot be used for measuring opaque objects.

There is a method of measurement consists in the fact that the light beam of the laser emitter passing through the beam-splitting prism is divided into two beams, one of which, passing without deviations on, gets on the line rotating with the settlement of annoy angular velocity of the mirror prism and rotated in a horizontal plane on the screen Ostroumova of dvuhmatchevogo pulse photosensor horizontal displacements. The second beam is reflected at an angle of 90° in relation to the first, passing through the rotary prism, is also sent to the mirror face of the prism and rotates in a vertical plane on the screen Ostroumova of dvuhmatchevogo pulse photosensor vertical displacement. Beam when passing through the sensors with frequency ω0is formed by a periodic sequence of current pulses. The position of these pulses in time is uniquely associated with a spatial position of the boundary and slotted photosensor and the distance between them. Measuring time intervals between pulses, it is possible to get information about offset

(UDC 681.518.3.001.24

681.586. The dissertation on competition of a scientific degree

621.397. doctor of technical Sciences "research and Development of technical control on the basis of the radiation scanning systems". Patent RU 2054626 C1 / MKI 6 G 01 21/00, No. 5050230/28). However, this method has disadvantages, because it also means having contact with the surface to be measured that for some surfaces and processing methods are not possible or desirable.

A known method lies in the fact that on the scanned surface is projected reference laser beam, wherein the reflected light is collected by the lens with circular optical sensor. tranny light is collected on the surface in the form of a circle, the radius of which increases with the distance to the scanned surface. Triangulation calculation of mean radius of the circle allows you to determine the distance to the measured point and eventually digitize scanned surface (CAD and Graphics from 04. 2000 "ModelSim 2000 System 3D - scan II"), adopted for the prototype. However, in the description there is no information revealing the mathematical essence of the method necessary to understand the scanning process. Also not specified how you can apply this method to scan panels and coverings.

The aim of the present invention is to empower scanning method, the mathematical description of the process, adaptation of the method for scanning a lengthy and large surfaces. The aim is achieved in that in the known method introduces a rotation of the laser around the longitudinal axis at an angle with the formation of the conical surface, so that the image sensor removes non-mirrored image of the beam in the form of a ring, and ring directly, which increases the measurement accuracy. Therefore, the proposed method meets the criterion of "novelty."

There is a method that uses a section of the scanned surface by a laser beam based on the laser triangulation lines, where skaniruet the second surface of the projected line, the optical image which is taken at an angle sensor. Thus, altitudinal changes of the surface into the shape change of the optical line image (Gubanov V., "development of the basic volumetric laser scanning for the processing programming on CNC equipment"; the dissertation on competition of a scientific degree of candidate of technical Sciences, Department of electronic engineering, Ural state technical University, Ekaterinburg), but do not specify how this method be used to scan large surfaces, and it does not have universal properties. Therefore, the proposed method meets the criterion of "substantial differences" and the criterion of "inventive step".

The proposed method is illustrated in figure 1. On the scanned surface 8 beam 4 of the laser oscillator 2, while rotating around the axis 5 at an angle 6 with the angular speed 3 on the scanned surface 8 is created ring 7. Received the ring removes the image sensor 1, located perpendicular to the normal of the surface 8, the axis of rotation 5 of the laser oscillator 2. Changing the shape of the surface will change the radius of the ring in the appropriate quadrant.

The mathematical description of the proposed method are presented in figure 2. The form definition surface is ti the i-th point based on the determination of the height of the i-th point on the base plane. Laser emitter 2 (figure 1), rotating at an angle α/2, creates the reference plane 1 a ring with radius R. the Scanned item 2 is located on the reference plane 1, therefore, the image sensor 1 (figure 1) comes onto the scanned surface is distorted ring with radius toward the target quadrant r. The height of the measured point Hiis determined by the formula

,

where Hi is the height of the measured point; R is the radius of the ring on the base surface in the 1st point; riis the radius of the distorted ring on the scanned surface in the i-th point; α/2 - angle laser emitter 2 (figure 1).

The scanning method of the form curved surfaces, namely, that on the scanned surface is exposed to a beam of light from a laser emitter, characterized in that, with the purpose of extending the known method, produce education conical luminous surface by rotating the laser emitter to create on the scanned surface of an image in the form of a ring, and the shape of the surface is determined by moving the ring on the scanned surface by interpolation of heights i-x of the points that define the relationship

where Ni- the height of the measured point;

R is the radius of the ring on the base surface in the i-the point;

riis the radius of the distorted ring on the scanned surface in the i-th point;

α/2 - angle laser emitter.



 

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