Device for performing visual amd measurement inspection of internal cavities

FIELD: non-destructive inspection.

SUBSTANCE: device has standard side-view endoscope, which has system for illuminating object and system for observing object provided with measuring scale. Device is additionally provided with bushing having linear and angular scales, which bushing is capable of translation and rotation about axis of symmetry of flange fastened to input opening of cavity to be controlled. Tube with optical system for laser illumination of object is mounted inside bushing; tube has microscopic laser and mirror. Tube is mounted in bushing for linear movement relatively endoscope in parallel to its longitudinal axis. Precision of measurement of sizes of objects disposed at long distances to surfaces to be controlled is improved. Measurement of coordinates of defect location on surfaces of object can be made with higher precision.

EFFECT: improved precision of measurement.

3 dwg

 

The invention relates to non-destructive testing and can be used for visual and measuring control of the inner cavities of various objects such as pressure vessels, tanks for storage of various gases and liquids, etc.

Currently, the great importance is the assessment of the size of defects to determine the degree of deterioration of objects and their residual lifetime [1]. It is produced using ocular scales, their price is determined by dividing the scale of the image defect at a particular distance from the surface to the lens of the endoscope with a known focal distance from the surface to the lens.

The distance to the object is estimated using triangulation rangefinder type [2, 3] or by the distance between the images of two parallel light beams directed to the object [4].

The lack of triangulation rangefinder type - scale non-linear and low accuracy when the distance to the object, considerably higher than the base range finder located inside of the endoscope.

The lack of rangefinder with parallel rays is also low accuracy at distances substantially greater than the distance between the beams.

However, many objects of modern technology requires the measurement of the internal dimensions of the cavities,substantially exceeding the diameter of the inlet (product type ball-cylinders and the like).

The purpose of the invention is to eliminate these disadvantages and to improve the accuracy of estimating the size of the defects when the distances to the controlled surfaces, greatly exceeding the diameter of the endoscope, as well as providing the possibility of measuring the coordinates of the location of the defects on the surface of the product.

Standard side-viewing endoscope containing the illumination system of object and system monitoring with measuring scale, which is additionally equipped with a sleeve, with the possibility of translational motion and rotation about the axis of symmetry of the flange to be fixed to the inlet port controlled cavity, on the side surface of the sleeve along its generatrix applied linear scale to measure the magnitude of its displacement relative to the flange on the end surface of the flange of the applied angular scale to measure the angle of rotation of the sleeve relative to the flange, the sleeve is set tube with an optical system of laser illumination of the object containing microlaser and the mirror, the pipe is mounted in the sleeve with the possibility of linear movement relative to the endoscope parallel to its longitudinal axis, angle γ tilt of the laser beam reflected from the mirror that was installed before microlasers to the longitudinal axis of the endoscope is selected γ=arctan(ΔH/Co), where ΔH - accuracy measurement distance the I to the object, Co - intercept of the scale of the micrometer mechanism for moving the tube, the minimum measured distance to the object determined by the relationwhere C is the distance between the longitudinal axis of the endoscope and the longitudinal axis of the tube with a laser illumination system, And the size of the linear field of view of the lens of the endoscope in the image plane, ƒ' is the focal length of the lens of the endoscope, the maximum value of the measured device, the distance to the object is determined by the formula Hmax≤b·tgγ, where b is the magnitude of movement of the tube with a laser illumination system using micropatronage mechanism.

Structural scheme of the device shown in figure 1. Figure 2 shows the optical scheme.

The device contains a standard side-viewing endoscope 6 which is mounted in the sleeve 4. The device comprises a sleeve 5 with two holes, the axis of which is parallel to the longitudinal axis of symmetry of the sleeve. On the lateral surface of the sleeve along its generatrix applied linear scale 7, which begins its linear movement relative to the flange 2, which is mounted on the input hole of the object 1. On the end surface of the flange caused the dial 4, which measured the angle of rotation of the sleeve 5 in the flange 2. The stopper 3 is used to secure the sleeve 5 in the flange 2 in neo the required position.

In one of the sleeve opening 5 has a standard endoscope 6 side view, the axis of sight which is perpendicular to its longitudinal axis. The endoscope has a channel illumination of the object 14 and 15 observations, which consists of a lens, a rectangular prism and scales. The object image is observed through the eyepiece or on the display 8 (in the case of the use of videoendoscopy).

In the second hole of the sleeve 5 is installed pipe 7 with the channel laser illumination of the object, consisting of a semiconductor laser and set before him an angle (90°-γ/2) mirrors. When this laser beam at the output of this system is distributed in a plane parallel to the plane passing through the longitudinal axis of the endoscope and its axis of sight, and is inclined to the longitudinal axis of the endoscope at an angle γ. Tube with laser illumination system moves through micropatronage mechanism 11 with a scale 13, mounted on a bracket 12 that is associated with the sleeve 5. The pipe is mounted a return spring 9 and the restrictive ring 10 to eliminate play with her movements. Tube with laser illumination system is moved parallel to the longitudinal axis of the endoscope. To prevent it turns in the bore of the sleeve 5 is applied to a standard type system Shponka-slot (not shown).

The device operates as follows.

N the inlet of the controlled cavity fixed flange, in which you installed the bushing with the endoscope and which is located parallel to the tube with a laser illumination system.

By moving the sleeve relative to the flange, the operator observes the inner surface of the controlled cavity. When the defect is detected, the rotating sleeve and moving it relative to the flange, the image lead to the center of the field of view of the endoscope and determine its polar coordinates on the test surface relative to the base coordinate system, for example, relative to the end face of a mounting flange, removing the samples from its circular scale and a linear scale on the generatrix of the sleeve.

Then the operator includes microlaser and watching a bright dot at the intersection of the laser beam with controlled surface leads using micromechanism her image on the line of the eyepiece scale, passing through its center and located perpendicular to the direction of movement of the tube with a laser illumination system (Fig 3, a).

At this point, take off the countdown with a mechanical or liquid crystal scales micropatronage mechanism and by multiplying the number of divisions no on tgγcalculate the current distance to the object according to the formula H=no·tgγ.

The reference point of the scale micropatronage mechanism it is advisable to take the minimum measured distance to the object. When this current Rass is the right to test surface is determined by the formula H=H min+no·Co·tgγ.

The image scale is determined by the formula m=H/ƒ', which is true for commonly used endoscopes short-focus lens with a large depth of field in the plane of interest in H≥20÷30ƒ'.

Then estimates the size of the defect in the plane of its occurrence through the eyepiece scale by the ratio x=n·i·ci·mi, where ni is the number of divisions of the eyepiece scale corresponding to the image defect, ci - intercept ocular scale.

In the case of extended defects, the image of which exceeds the field of view of the lens of the endoscope, their size can be determined by the method of successive aiming crosshair eyepiece scale on the edge of the image defect by moving the sleeve flange and the dierence is taken on its scale counts, i.e. X=t1-t2(Fig 3, b).

A distinctive feature of the device is the ability to control the accuracy of measuring the distance to the object and the range of measured distances by changing the angle γ tilt mirror before microlasers to its axis and/or change the length b of the scale micropatronage mechanism.

In practice usually take tgγ=10 (γ≈84°30), which simplifies the calculations.

Applying the simple techniques of microprocessor processing and micrometry the mechanism for moving the tube with the laser and the electronic scale interface type RS-232 for communication with the computer, it is easy to implement the device with the scales directly calibrated in units of distance to the object and/or scale factors of the image.

Literature

1. Christmas J.V., Sattarov D.N. Fiber optics in aircraft and rocket technology. M.: Mashinostroenie, 1977, 188 S.

2. U.S. patent, NCI 356-1 No. 3817619.

3. The prospect of the firm Everest, USA Shadow Probc, 2002.

4. U.S. patent, NCI 356-156 No. 3730632.

Device for visual and measuring control of internal cavities containing a side-viewing endoscope with a measuring eyepiece scale, characterized in that the side-viewing endoscope containing the illumination system of the object and the system of his observations with a measuring scale, is mounted in the sleeve, with the possibility of translational motion and rotation about the axis of symmetry of the flange to be fixed to the inlet port controlled cavity, on the side surface of the sleeve along its generatrix applied linear scale to measure the magnitude of its displacement relative to the flange on the end surface of the flange of the applied angular scale to measure the angle of rotation of the sleeve relative to the flange, the sleeve is set tube with an optical system laser illumination of the object containing microlaser and the mirror, the pipe is mounted in the sleeve with the possibility of linear movement relative to the endo the Copa parallel to its longitudinal axis using a micrometer mechanism, mounted on the sleeve, the plane of the laser beam is parallel to the plane formed by the axis of sight of the lens of the endoscope and its longitudinal axis, angle γ tilt the laser beam reflected from the mirror that was installed before microlasers to the longitudinal axis of the endoscope is selected γ=arctan(ΔH/C0), where ΔN-accuracy distance measurement to the object, With the0- intercept of the scale of the micrometer mechanism for moving the tubes,

the minimum measured distance to the object opredelaetsa ratio

where C is the distance between the longitudinal axis of the endoscope and the longitudinal axis of the tube with a laser illumination system,

And the size of the linear field of view of the lens of the endoscope in the plane of the image

f' is the focal length of the lens of the endoscope,

the maximum value of the measured device, the distance to the object is determined by the formula Hmax≤b·tgγ, where b is the magnitude of movement of the tube with a laser illumination system using micropatronage mechanism.



 

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