Laser roughness indicator

FIELD: inspection of profile of items with complex shape.

SUBSTANCE: laser roughness indicator additionally has two objectives, which have optical axes disposed in plane formed by axes of lasers and by longitudinal axis of blade. Optical axes are disposed symmetrically at angles α to longitudinal axis of blade. Optical axis of TV camera's optical; axis coincides with axis of first additional objective. Beam splitter is mounted between the objectives. Reflector is mounted at cross point of optical axis of second additional objective with perpendicular erected from point of cross of reflecting face of beam splitter with axis of TV camera objective at plane of disposition of optical axes of additional objectives. Focal points of additional objectives are brought into coincidence with each other and with cross point of laser axes and with longitudinal axis of blade.

EFFECT: simplified design; improved metrological parameters.

1 dwg

 

The invention relates to non-destructive testing and can be used for contactless control of the profile of complex-shaped products. For example, blades for gas turbine engines, propellers, rent, etc.

A device for controlling the profile of the blades by the method of light-section, containing the mechanism of attachment of the blades, optical projector, the optical axis of which coincides with the longitudinal axis of the controlled vanes, springs slit illumination blades in the plane perpendicular to its longitudinal axis, and forming on its surface in a predetermined section of a thin light band, which will outline the outline of this section, which is projected on the screen, and the mechanism for moving the blade along its longitudinal axis [1].

Drawback - the inability to obtain the contour of the blades of complex shape, for example, with double curvature and/or a device for fastening them in the rotor, due to the shielding effect of the outline of those elements.

Known laser profilometer rental, containing the laser source to the target illumination products in a plane perpendicular to the longitudinal axis of the object, and a television camera located on different sides of the product for the formation of images of individual sections of the circuit section connected in one image of the optical and/or television method [2].

p> The disadvantage of this device is the design complexity, high cost, low metrological characteristics due to the identical optical and electronic characteristics of individual television channels.

The purpose of the invention is the elimination of these disadvantages.

For this purpose, in the device containing the mechanism of attachment of the blade and move it along its longitudinal axis, the laser sources slit illumination blades in a plane perpendicular to the longitudinal axis of the blade, and a TV camera with lens, additionally introduced two identical lens located in front of the camera, the optical axis are in the plane formed by the longitudinal axis of the blade and the optical axis of the lens of the camera, and are located in the plane symmetrically with respect to the axis of the lens at an angle α to the longitudinal axis of the scapula, between the lens of the camera and the first additional lens on the optical axis has a beam splitter, a reflecting plane which is perpendicular to the plane which contains the axis of the additional lens and set at an angle of 45° to the axis of the lens of the camera at the intersection of the optical axis of the second additional lens with a perpendicular line drawn from the intersection point of the beam splitter with the axis of the first additional lens in the plane in which the location is by the axis of optional lenses also have a reflector, the plane of which is perpendicular to this plane, and the normal angledto the optical axis of the second additional lens, the point of intersection of the optical axes of optional lenses with the longitudinal axis of the blade coincides with the tricks of these lenses, the focal length of the additional lens is chosen from the relationwhere H is the maximum height of the controlled sections of the scapula, f0- focal length lens cameras, d - size CCD cameras, K=0,8-0,9 - factor, the tilt angles of the optical axes of the additional lenses are selected basedwhere t is the maximum height of the shielding element on the front edge of the blade, Δ - the distance from the element to the controlled section, located at a minimum distance from the edge.

Diagram of the device shown in the drawing

The Profiler consists of attachment points 2 and longitudinal movement 3 of the blade 1 along its longitudinal axis, two symmetrically located on both sides of the blades laser slit light, consisting of lasers 4 and 4' and the cylindrical lenses 5 and 5', forming the lateral surfaces of the blades narrow light stripes, visualizing the profile of the blades in the data section. Flat light beams generated by laser lights, lie in the same plane, perpendicular to the longitudinal axis of the blade. The optical axis of the laser 4 and 4' lie on one straight line passing through the point of intersection of the longitudinal axis of the blade with the plane of propagation of the plane of laser beams.

In the plane formed by the longitudinal axis of the blades and axes of the lasers are located at angles α to the longitudinal axis of the blade, the optical axis of the lenses 6 and 6' diameter DKand a focal length f'K. The foci of the lenses 5 and 5' is aligned with the point a of intersection of the axes of the lasers with the longitudinal axis of the scapula.

Before the first additional lens 6 on the optical axis sequentially installed a beam splitter 8 and the camera containing a lens 9 with a focal length of f0and a diameter of D0and CCD size d×d installed in the focal plane of the lens 9. The profile picture of the scapula see on the monitor 11.

A beam splitter 8 is made in the form of a prism is a cube with sides S, semitransparent reflecting surface which is coincident with a diagonal plane of the prism cube oriented at an angle of 45° to the axis of the lens 9 and perpendicular to the plane of arrangement of the optical axes of additional lenses 6 and 6'.

The distance t between the lenses 6 and 9 is selected from a ratio ofδ S≈(0,1-0,3)S - constructive tolerance on the installation size of the prism cube 8.

At point B at the intersection of the optical axis of the second additional lens 6' and perpendicular recovered from the points of intersection of the reflecting surface of the prism is a cube with the axis of the lens 9 in the plane of arrangement of the optical axes of the lenses 6 and 6' is perpendicular to this plane has the reflector 7, the normal to which the point B is located at an angle to the optical axis of the second additional lens 6'. Of a right-angled triangle ABC should be apparent ratio of 2β=90-2αwhere

The diameters of the lenses DK6 and 6' are selected from the condition DK<D0in accordance with the requirements of the allowable value asymmetrical transformation of the image of the light section of the object with the maximum value N.

The device operates as follows.

At the intersection of the longitudinal blades 1 on its surface with symmetrical in relation to the laser slit light image formed of thin light strips, accurately reflecting the cross-sectional profile of the blade in the specified plane.

Additional lenses 6 and 6' form parallel beams that are spatially combined by the reflector 7 and the beam splitter 8 and the lens 9 is ocuserts on the surface of the CCD 10, forming an image of the profile of the blade consisting of two optically aligned parts (figure 1). When configuring the optical system Profiler the precise combination of these separate images is adjusting spreads reflector 7 by using appropriate mechanisms, not shown in the diagram in virtue of being well-known [3].

The need for monitoring different sides of the blade by means of two lenses arranged at an angle to the longitudinal axis of the blades, due to the presence on the front edges of modern blades mounting for installation in buildings turbines and/or double curved blade, which leads to the shielding sections located in the immediate vicinity of these elements (figure 1,b). The choice of angle α made from obvious correlationwhere t is the maximum height of the shielding element, Δ - the distance to the controlled section.

Since the focal plane of the lenses 6 and 6'coincide with the plane of the object on the outlet are formed parallel beams, which are then focused by the lens 9, forming in the image plane of the CCD array 10, the image light path of the blade in the selected section. At the same time, the property telescopic systems with parallel swing beams between the components [3], the difference of optical paths between the lenses 6 and 6' and the lens 9 does not change the sharpness of the image scale, formed by these elements of the optical system.

The scale of the image section in the plane of the CCD-matrix for the optical system with parallel swing beams between the components, as is well known, is equal toThe image H' section blades maximum size should not go beyond the receiving area of the CCD-matrix of size d with regard to admission to the possible displacement of the image due to the variations in sizes of blades and various technological factors (figure 1,b). Becausethe condition of selection of the focal length of the additional lens can be written in the formwhere K=0,6-0,9 - constructive factor that takes into account the random shift of the image.

For accurate measurements of the cross sections for pre-calibration of the monitor on test samples of known size. Calibration is performed for two mutually perpendicular directions in order to eliminate the influence on the measurement results rakursnii distortion, due to the fact that the size of the cross section in the direction perpendicular to the axis of lens (Hα), is associated with the true value of N. the apparent ratio of Hα=H·cosα.

The relevant amendments are automatically recorded by the computer, which is part of the pros is metra.

LITERATURE

1. Rabinovich A.N. Devices and systems for automatic control of machine parts. Kyiv.: Technique, 1970, 206 S.

2. Valleys B.C. Television Automatica. L.: Energy, 1989, 126.

3. Reference designer optical-mechanical devices under the editorship of Krueger MA M.: engineering, 1980, 742 S.

A laser profilometer for control of profile products of complex shape types of blades for gas turbine engines a method of the light-section, containing the mechanisms of attachment and longitudinal movement of the vanes, springs slit illumination vanes located symmetrically with respect to the blade with its opposite sides and forming a flat light beams in the plane perpendicular to the longitudinal axis of the blade, the camera and the computer to calculate the parameters of the controlled section, characterized in that it further includes two additional lens, the optical axis are in the plane formed by the axes of the lasers and the longitudinal axis of the blades, and are located symmetrically at angles α to the longitudinal axis of the scapula, optical the lens axis of the camera coincides with the axis of the first additional lens, between the lens has a beam splitter, a reflective translucent face which is installed perpendicular to the plane formed by the axes of the additional lens and inclined at an angle of 45° to the axis of the lens of the camera at the intersection of the optical axis of the second additional lens perpendicular recovered from the point of intersection of the reflecting faces of the beam splitter, with the lens axis of the camera in the plane of arrangement of the optical axes of additional lenses perpendicular to this plane has a reflector normal to the plane which is angledto the optical axis of the second additional lens, points, tricks optional lenses coincide with each other and with the point of intersection of the axes of the lasers and the longitudinal axis of the blade, the focal length of the additional lens f'tochosen based on the ratio

where f'0-focal length lens cameras,

d - the size of the CCD array,

N-the maximum size of the controlled section,

K=0,8-0,9 - constructive factor

the tilt angles of the optical axes of additional lenses to the longitudinal axis of the blade is selected from a ratio of α≥arctan(), where t is the maximum height of the blades, controlled shielding section Δ - the distance from the section to the shielding element.



 

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