Mode of measuring the form of an object and an arrangement for its execution

FIELD: the invention refers to measuring technique.

SUBSTANCE: the mode of measuring the form of an object includes formation of a light line on the surface of the object with the aid of the light-emitting system lying in the preset cross-section of the object, getting the image of the light line, its processing and definition of the coordinates of the profile of the cross-section of the object. AT that collateral light lines are formed on the surface by turns with the aid of two light-emitting systems illuminating the surface in preset cross-section of the object at different angles in its every point, images of light lines are received. On each of them sites are revealed. A resultant image is compiled out of the images of the indicated sites. According to this resultant image the coordinates of the profile of the cross-section of the object are determined. The arrangement for measuring the form of the object has a light-emitting system optically connected with a photoreceiver and a computing unit. It also has one additional light-emitting system optically connected with a photoreceiver and a commuting unit connected with its input to the computing unit, and with its output - with every light-emitting system. Optical axles of light-emitting system are placed in one plane and located to each other at an angle equal 5-800.

EFFECT: the invention increases accuracy of measuring by way of excluding the distortions of the zone of influence on the results of measuring.

13 cl, 5 dwg

 

The invention relates to measurement techniques, in particular to a method of measuring the shape of the object and the device for its implementation, and can be used in the aircraft engine industry, mechanical engineering and other engineering fields for measuring geometrical parameters of the surface profile of the object optoelectronic method.

The known method of measuring the shape of an object, comprising the simultaneous illumination of two different sections of a given cross-section of the object two light-emitting systems in the direction perpendicular to the specified section, the observation of a shadow image of the study details, registered geometric parameters of the circuit, the selection on this path and the image of the light traces lines of identical coordinates of the surface points and the definition of mutual relations of the coordinates of these points on different images of geometric parameters relative position mentioned surface areas studied (see patent RU No. 2105265, CL. G 01 B 11/24, publ. 20.02.1998).

This method is difficult to perform and, in addition, it is not possible with a high degree of accuracy to measure the shape of the object, as it does not take into account the area of the distortions that appear in the image due to a flare, generated in the range of rays incident normal to the surface, on the surface due to the curvature and the quality of processing is ernesti.

The closest to the invention is a method of measuring the shape of the object, including lighting one light-emitting system, forming in one narrow direction of the probe light line normal to the object surface, the formation of the image of the illuminated point of the object, the coordinates of points along the probe light line and image processing (see patent RU No. 2124700, CL. G 01 B 11/00, publ. 10.01.1999 year).

The disadvantage of this method is the low accuracy of determination of the object's shape. This is because the image light line on the surface of the object in the zone of action of the rays incident normal to the surface of the formed area of the flare due to the curvature and surface finish. This leads to loss of information about the curvature of the surface in this area and, as a consequence, the error in the determination of the coordinates.

A device for measuring the shape of the object, containing two symmetrically located relative to the measured surface of the object light emitting system, the sensors and computing unit, while the light-emitting optical system associated with a photodetector, the output of each of which is connected to the input of the computing unit (see patent RU No. 2105265, CL. G 01 B 11/24, publ. 20.02.1998,).

The disadvantage of this device is the low accuracy of the measured what I because the measurement does not take into account the influence zone of the distortion generated by the glare.

The closest to the proposed device is a device for measuring the shape of the object containing the light-emitting system, optically connected with a sensor, and a computing unit (see patent RU No. 2124700, CL. G 01 B 11/00, publ. 10.01.1999 year).

The disadvantage of this device is the low accuracy of the measurement because of the impossibility of excluding the influence on the measurement results area of the flare formed on the measured surface of the object.

The technical result related to the way - increase measurement accuracy by eliminating the influence zone of distortion on the measurement results.

The technical result relating to the device, the increase measurement accuracy by eliminating the influence zone of distortion on the measurement results.

The technical result relating to the method is achieved in that in the method of measuring the shape of an object, comprising forming on the surface of an object by using a light-emitting system, the light line lying in a predetermined section of the object, obtaining image light line, the processing and determination of the coordinates of the profile cross-section of the object according to the invention, form a matching on the surface of the light lines alternately with at least two light-emitting systems, the broadcasting surface in a predetermined section of the object at different angles at each of its points, receive image light lines, each of them reveal undistorted areas of the images of these sites compile the resulting image, which carry out the determination of the coordinates of the profile cross-section of the object.

To improve the accuracy of control and productivity by providing the ability to measure parts from two opposite sides, you can optionally form a light line in the same plane on the opposite side of the measured object in the specified section.

The technical result relating to the device is achieved in that the device for measuring the shape of the object containing the light-emitting system, optically connected with a sensor, and a computing unit according to the invention contains at least one additional light-emitting system, optically connected with the photodetector, and a switching unit, connected with the entrance to one of the outputs of the computing unit, and the output of each light-emitting system, and the photodetector output connected to the input of the computing unit, the optical axis of the light-emitting systems placed in one plane and are arranged to each other at an angle equal to 5-80°.

The location of the optical axes at an angle 5-80° allows you to “post” zone glare on the image of each light-emitting system is we are on different parts of the section analyzed (measured) of the object depending on the curvature and the quality of the surface and thereby eliminate their influence on the measurement results; beyond the bounds of the specified range, the reliability of measurement results is very low, since it is impossible to consider the impact of flare on the image due to the inability explode zone glare on the plots of the measured section.

In the case of measurement of complex components, as well as to improve the accuracy of control and the performance of the device may contain at least two additional light-emitting system, which is located in the same plane on the opposite side of the examined object and the second photodetector, optically associated with the additional light-emitting systems and connected the output to the auxiliary input of the computing unit, while the optical axis of the light-emitting systems are to each other at an angle equal to 5-80°.

The device may include a display connected input to another output computing unit that allows you to visualize the results of the measurements.

To simplify the design of the light-emitting system can be made in the form of generators of light lines.

As the object of measurement can be selected blades of the gas turbine engine.

1 schematically shows a device for measuring the shape of the object;

figure 2 is an optical diagram of the device;

figure 3 - histogram of the intensity distribution of the radiation is the area of the flare;

figure 4 - histogram of the intensity distribution of the radiation in the zone of the lack of flare;

figure 5 is an algorithm to eliminate the effect of glare on the measurement results.

As the object of measurement selected compressor blade of a gas turbine engine. The longitudinal axis of the blade aligned with the Z axis of the coordinate system XYZ.

The implementation of the method is examined on the example of measurement of parts of complex shape and compressor blades of gas turbine engines, with a light-emitting system is made in the form of generators of light lines. The generators are arranged in pairs and symmetrically from opposite sides (back and troughs) of the scapula.

The device contains the generators 1, 2, light lines that are spaced from the side of the back, and additional generators 3, 4 light lines that are spaced from the trough of the blades 5, acting in the same plane Q perpendicular to the axis Z. Optically associated with the generators 1, 2, the photodetector 6 and lens 7 and optically associated with the generators 3, 4 second photodetector 8 and lens 9, and the photodetectors 6, 8 are arranged at an acute angle α to the plane of the radiation generators 1, 2, 3, 4 (0<α>90°). Computing unit 10, the input of which is connected to the outputs of the photodetectors 6, 8, a display 11 and block 12 switching, connected to different outputs of the computing unit 10. The block 12 of the switching p is dglucan output for each generator 1, 2, 3, 4.

Generators 1, 2, 3, 4, photodetectors 6, 8 and the blade 5 is fixed on the platform (not shown). The blade 5 has the ability to move along the Z-axis and relative to the platform.

The location of the photodetectors 6, 8 at an acute angle α to the plane of the radiation generators 1-4 can simplify the design of the device.

Light-emitting system is made in the form of generators, since the generators are available commercially, have small dimensions and sufficient power, however, the light-emitting system can comprise a laser and a cylindrical lens, and other types of light emitting sources.

The device and method of measurement are as follows.

Set on a platform (not shown) of the blade 5 as measured by the surfaces back and trough - to the generators 1, 2 and 3, 4, symmetrically located from the side of the backrest (generators 1, 2) and the trough (generators 3, 4), two on each side, the photodetectors 6, 8 lenses 7, 9, respectively. The optical axis of the generators 1, 2 are arranged to each other at an angle of 35° (the drawing is not marked). The optical axis of the generators 3, 4 are located to each other at an angle 39° (the drawing is not marked).

When the device is switched on rays generators 1-4 alternately form a matching on the object surface, the back and the trough blades 5 light is the new line in the same plane Q, perpendicular to the Z-axis from the back and sides of the trough blades 7, at a given cross-section, with two generators 1, 2 alternately form the light line on the back of the blade 5 and two generators 3, 4 alternately form the light line at the trough of the blades 5. The image light lines follows the relief of the measured cross-section surface of the blade 5. Light lines fall on the lenses 7, 9, which form an image on the photodetector arrays 6, 8. Converted into an electric signal, the image is transferred to the computing unit 10, where the determination of the coordinates of the points of the cross section profile and the combination of images of the back and nothing. The display 11 is a display image of the measured cross section and the measurement coordinates of the points of the cross section of the blade 5.

In the computing unit 10, the algorithm is implemented (see figure 5, where the x - coordinates of the object): “identify, eliminate, replace, allowing to obtain the desired result. When you see the profile picture of the cross section area distortion under the action of the flare in the computing unit 4 is the analysis and determination of area distortion by comparing the width of the cross-section line (figure 3). As the reflections occur at the images on different parts of the section (see figure 3, curves 1, 2), turn off the generators 1, (2), 3,(4) through the switching unit 12, p is alternately removing zone distortion (see Fig,5, curves 3, 4) and substituting the area distortion undistorted image line from another generator 2, (1), 4 (3), get compiled (undistorted) of the two images the image of the profile line of the cross section of the blade (see figure 3, curve 5).

To measure the next section of the blade 5 move it in the longitudinal direction of the platform along the z-axis.

If zone distortion are formed on the back, you need to work with generators from the back, if zone distortion formed by the trough, it is necessary to work with generators from the side of the trough, i.e. the generators work in pairs.

A dimension object can move in any direction depending on the degree of freedom of the selected object and perform the required measurements. The plane in which generate light lines and form the image light lines may be inclined to the Z-axis (the longitudinal axis of the object at an angle other than 90°for example from 87° 93° depending on the geometry of the object, but 90° is optimal from the point of view of improving the reliability of the measurement result. Beyond this range significantly decreases the accuracy of the measurement.

Means included in the device (generators, sensors, etc.), known from the prior art, therefore, their design is all not disclosed. So, as generators of used laser generators lines GL-35-3,5 VA, sensor - digital camera VS-CTT-205-2001, personal computer P-III-360 display. Switching of lasers was carried out manually.

1. The method of measuring the shape of an object, comprising forming on the surface of an object by using a light-emitting system, the light line lying in a predetermined section of the object, obtaining image light line, the processing and determination of the coordinates of the profile cross-section of the object, characterized in that the shape matching on the surface of the light lines alternately with at least two light-emitting systems, covering the surface in a predetermined section of the object at different angles at each of its points, receive image light lines, each of them reveal undistorted areas of the images of these sites compile the resulting image, which carry out the determination of the coordinates of the profile cross-section of the object.

2. The method according to claim 1, characterized in that it further form the light line in the same plane on the opposite side of the measured object in the specified section.

3. Device for measuring the shape of the object containing the light-emitting system, optically connected with a sensor, and a computing unit, characterized in that it contains at least one additional light-emitting system, optically associated with the photodetector, and a switching unit, connected with the entrance to one of the outputs of the computing unit, and the output of each light-emitting system, and the photodetector output connected to the input of the computing unit, the optical axis of the light-emitting systems placed in one plane and are arranged to each other at an angle 5-80°.

4. The device according to claim 3, characterized in that it contains at least two additional light-emitting system, which is located in the same plane on the opposite side of the examined object and the second photodetector, optically associated with the additional light-emitting systems and connected the output to the auxiliary input of the computing unit, while the optical axis of the light-emitting systems are to each other at an angle 5-80°.

5. The device according to claim 3, characterized in that it contains a display, an input connected to another output of the computing unit.

6. The device according to claim 3, characterized in that the light-emitting system is made in the form of generators of light lines.

7. The device according to claim 3, characterized in that as the object of measurement selected blades of the gas turbine engine.

8. The device according to claim 4, characterized in that it contains a display, an input connected to another output of the computing unit.

9. The device according to claim 4, the tives such as those that light-emitting system is made in the form of generators of light lines.

10. The device according to claim 4, characterized in that as the object of measurement selected blades of the gas turbine engine.

11. The device according to claim 5, characterized in that the light-emitting system is made in the form of generators of light lines.

12. The device according to claim 5, characterized in that as the object of measurement selected blades of the gas turbine engine.

13. The device according to claim 6, characterized in that as the object of measurement selected blades of the gas turbine engine.



 

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