Device for control of inner surfaces of articles

FIELD: measuring engineering.

SUBSTANCE: device comprises housing that receives electric lamp, toroidal lens, conical mirror of ring vision, lens, and scaling grid arranged in series. The device is additionally provided with aperture with ring and central round recesses positioned in front of the lamp, ring and round color filters mounted in front of the recesses, and second mirror cone positioned behind the aperture. The top of the cone points to the lamp. The semi-transparent mirror, color filter, measuring grid, and first TV camera are arranged along the longitudinal axis of the housing behind the lens. The second color filter, second measuring grid, and second TV camera are arranged in series along the perpendicular to the axis of the housing behind the lens.

EFFECT: expanded functional capabilities.

3 dwg

 

The invention relates to non-destructive testing, and more specifically to devices for visual and/or TV control inner surface of bodies, such as pipes of various types, welded pipes, casings for aircraft engines, chimneys, etc.

It is known device for controlling the internal surface of the bodies, comprising a cylindrical casing and consistently installed inside it along its longitudinal axis lighting system with an electric lamp and a toroidal lens surveillance system with mirror ring review, lens, large-scale grid and the eyepiece, and the mirror system observations made with conical reflective surface, the apex of the cone being directed in the direction of the lens.

The disadvantage of this device is the inability of the visual inspection of the surface of the product in area that is located outside the brightly lit ring-band stripes on its inner surface, generated from the light source toric lens and having a high contrast, creating a binary image in the plane of observation.

The use of optical fiber for transmitting the image limits the depth of view, reduces the comfort of observations does not allow digital processing of the image on the computer.

Thus, there is the technical problem of the extension h is HN control during visual inspection of the inner surface of the products while controlling its internal profile and ensuring the possibility of obtaining the relevant television images in their computer processing.

We offer a solution to this technical problem, based on the introduction into the device additionally aperture ring and a circular Central cut-out, installed in front of the lamp and hosts the filters respectively circular and round shape, the second mirror cone, located behind the diaphragm to the longitudinal axis of the housing, and the top of the cone facing the lamp, where the maximum Dmaxand the minimum of Dminthe diameters of the annular neck of the diaphragm are determined respectively by the formulas Dmax=2·SD·tgαmaxDmin=2·SD·tgαminwhereD2- outer diameter of the toroidal lens, Sl- the distance from the lamp to the toroidal lens, SD- the distance from the lamp to the diaphragm, αmin=arctan(D1/2·Sl), D1the inner diameter of the toroidal lens.

The diameter of the Central cutout of the diaphragm DCthe maximum diameter of the second mirror cone Dtoand the distance from the lamp to the second cone Stoconnected by the relation Dto=DC·(Sto/Sl).

Behind the lens with its optical axis coincident with the longitudinal axis of the housing, arranged in series semi-transparent mirror, a first filter, the first measuring grid and the first body is Amer, and on an axis perpendicular to the lens axis and passing through the point of restraint semi-transparent mirror with the axis of the lens sequentially arranged second filter, the second measuring grid and the second camera, identical to the first, and the distance between a point of intersection of the axis of the lens with translucent mirror first and second cameras along the corresponding axes are equal, the first optical filter has a spectral characteristic that is identical to the circular filter aperture, the second optical filter has a spectral characteristic that is identical to the Central filter aperture, and the spectral characteristics of the color filters do not overlap in the spectral sensitivity range of both cameras, video cameras linked to monitors and/or computer systems visualization, and image ring the strips formed by the toroidal lens on the object surface in the spectral range of the transmittance of the first filter and display its profile, observed only in the imaging system associated with the first camera, and the image of the annular zone of the surface of the object and located on the various defects generated by the second camera in spektralnom the range of the second filter are observed only on the imaging system associated with the second camera, if this is m because of the symmetry of the optical elements of the monitoring system, behind the lens, and the identity of the optical characteristics of the first and second cameras formed by them ratespecial image ravemaster, and rates of divisions of the first and second measuring grids are equal to each other.

Diagram of the device represented in figure 1.

The device comprises a hollow cylindrical body 1 and successively installed in an electric lamp 2, a toroidal lens 3, the diaphragm 1 with the notches of the ring and the circular form located on the ring of the filter 5 and the round filter 6 with different spectral characteristics, non-overlapping spectral sensitivity range of the camera, the mirror cone 7, the top of which facing the lamp, the mirror cone 8 in the surveillance system with the top facing the lens 9, the beam splitting mirror 10, the first filter 11 and the first measuring grid 12 located in front of the camera 13, the second color filter 14, a second measuring grid 15, the second camera 16, the imaging signals 17 and 18 formed respectively in the first and second cameras.

Imaging systems and image processing may include a computer (not shown in figure 1 effect of being well-known) and other devices.

The device operates as follows.

The toroidal lens 3 forms on the surface of the object is narrow with youuu striped ring shape in the spectral range, defined spectrum bandwidth set on the aperture ring of the filter, for example, red in the case of the use for the manufacture of glass filter brand COP-19.

Part of the light bulb 2 which has passed through the filter 6, mounted in front of the Central cut-out aperture through the second mirror cone 7 with the angle at the vertex of the 90° and installed at a distance of Stofrom the lamp 2, is equal to the distance Slfrom it to the image plane of the toroidal lens 3, covers the inner surface of the object in the annular zone, symmetrically located relative to the image ring flat light generated by the toroidal lens 3.

The width of this zone on the surface of the object is approximately equal to the axial length of the cone lto=V2·(Dto/2), is chosen with regard to depth of field of the lens 9 of the surveillance system. The spectrum of the radiation passed through the main filter 6, does not overlap with the spectrum of the radiation passing through the annular filter 5.

Lens 9 with a conical mirror 8 ring observation, semi-transparent mirror 10, the filter 14 generates at the input of the first camera image of the ring light strips formed of a toroidal lens 3. However, in accordance with the known principle of the light-section contour of the image is the strip repeats the profile of the inner surface of the object in the plane, coincident with the focal plane of the toroidal lens, perpendicular to the longitudinal axis of the housing.

The angles between the normal to the object surface and the optical axis of the toroidal lens 3 and the lens 9 (taking into account reflections from cone 8, with the angle at the vertex 45°) taken equal to 45° to reduce image distortion profile of the object in a controlled cross-section, since the transmittance spectrum of the filter 14 is identical to the spectrum bandwidth of the filter 5 and does not overlap with the spectrum bandwidth of the filters 6 and 11 (see figure 2), on the screen of the imaging system 18 of the camera 16 there is only the image of the light section of the object (Fig 3,a).

At the same time using the lens 9 and the mirror cone 8 of the filter 11 and the camera 13 on the screen of the visualization system 17 is formed image of the object in the annular zone adjacent to the plane of the light-section (Fig 3,b). Thus, the operator can monitor the images of the light section of the object and the surface quality in the adjacent annular zone.

Measuring grid 12 and 15 are used to estimate the size of the defects and distortions of the profile.

Device for controlling an internal surface of bodies, containing a hollow cylindrical body, which has been consistently found inside it along its longitudinal axis lighting system, containing the I electric lamp and a toroidal lens and the Supervisory system of the conical mirror ring review lens and the grid, characterized in that it further comprises front of the lamp on the longitudinal axis of the housing aperture with the ring and the Central circular cutouts in front of them installed filters, respectively circular and round shape, the spectral characteristics of which do not overlap, the second mirror cone, located behind the diaphragm to the longitudinal axis of the housing, and the top of the cone facing the lamp, the maximum Dmaxand minimum Dminthe diameters of the annular cutout aperture placed in front of the lamp, are determined respectively by the formulas Dmax=2·SD·tgαmaxwhere SD- the distance from the aperture to the lamp,

,

where D2- outer diameter of the toroidal lens, S1- the distance from the lamp to the lens, Dmin=2·SD·tgαmin,

where

D1the inner diameter of the toroidal lens, and a diameter of DC- the Central hole in the diaphragm is placed in front of the lamp, and the maximum diameter of the second mirror cone lighting systems Dtoassociated with the distance to the cone from the lamp Storatio

,

for the lens on the longitudinal axis of the CDF the USA are semi-transparent mirror, the filter, measuring the grid and the first television camera, with the lens axis perpendicular to the longitudinal axis of the housing and passing through the point of intersection of the semi-transparent mirror with the longitudinal axis of the housing, consistently set the second filter, the second measuring grid and the second television camera, and the distance between a point of intersection of the semi-transparent mirror with the longitudinal axis of the housing to the first and second television cameras along the corresponding axes are equal to each other, the first located behind the lens before the first camera to the optical filter has a spectral transmission characteristic of identical annular filter located on the placed in front of the lamp aperture, and the second optical filter located behind the lens before the second the camera has a spectral transmission characteristic of identical annular filter located on the placed in front of the lamp aperture, and the second optical filter located behind the lens in front of the second camera has a spectral transmission characteristic of identical circular filter located in front of the Central round neckline aperture placed in front of the incandescent lamp, the image of the ring strips, showing the surface profile is observed only on the first mon of the Torah, visualizing the video signal from the first camera and the images annular zone of the surface of an object and its defects are observed only on the second monitor, visualizing the video signal from the second camera, the scale of images annular strips, showing the profile of the object on the first monitor and the Central section of the image of the object surface onto the second monitor, as well as rates of divisions of the first and second measuring grids are equal to each other.



 

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FIELD: measuring engineering.

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EFFECT: improved quality of control.

4 cl, 4 dwg

FIELD: measuring engineering.

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EFFECT: enhanced precision.

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2 cl, 1 dwg

FIELD: measuring equipment.

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EFFECT: higher quality.

1 dwg, 1 ex

FIELD: the invention refers to measuring technique.

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13 cl, 5 dwg

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EFFECT: expansion of nomenclature of controlled surfaces, decreasing large-sized dimensions of the interferometer.

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EFFECT: enhanced reliability.

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EFFECT: enlarged operating capabilities.

3 cl, 2 dwg

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