SU1749900A2 - Device for determining extreme sizes of object image - Google Patents

Abstract

The invention relates to automation and computer technology and can be used in industrial control systems for lenses when measuring their linear dimensions in the case of contrasting objects. The purpose of the invention is to expand the functionality by ensuring the invariance of measurement results with respect to rotation and parallel shift of the image is achieved by combining the optical axis of the device with the center of gravity of the image of the object, for which two pending multivibrators, two detectors of zero, two blocks of movement of the photoreconverter are introduced. 1 hp ff, 3 ill.

Description

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The invention relates to automation and computing, can be used in industrial control systems for measuring the linear dimensions of contrasting objects and is an improvement of the invention according to the author. №11Ш53.

The purpose of the invention is to expand the functionality by ensuring the invariance of the result of measuring the extreme dimensions of the image of objects with respect to rotation and parallel displacement of objects.

Fig. 1 shows a functional diagram of the device: Fig. 2 shows a block diagram of the movement of a photoconverter; on fig.Z - timing charts of the device.

The device for determining the extreme sizes of the image of objects (Fig. 1) contains a quadrature generator 1

voltage, the first multiplier 2, the second multiplier 3. the transducer 4, the first block 5 of the transducer movement, the second block 6 of the transducer movement, the first detector 7 zero, the second detector 8 zero, the first waiting multivibrator 9, the second waiting multivibrator 10. first key 11, the second key 12, the adder 13, the first memory block 14, the second memory block 15, the video amplifier 16, the bipolar pulse generator 17, the differential amplifier 18, the detector 19.

The transducer displacement unit (phyt 2) contains the first analog-digital converter 20, the second analog-digital converter 21, the first accumulating adder 22, the second accumulating adder 23, the first group of elements AND 24. the second group of elements AND 25, the element 26 of comparison, fur h |

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displacement base 27, element 28, element NOT 29, first information input 30, second information input 31, first 32, second 33, third 34 and fourth 35 control inputs, output 36.

The time diagrams of the device operation (Fig. 3) show pulses 37 at the outputs of the quadrature voltage generator, pulses at the first 38 and second 39 outputs of the bipolar pulse generator, pulses at the outputs of the first 40 and second 41 detectors, zero, pulses at the outputs of the first 42 and the second 43 waiting multivibrators, pulses at the inputs Zeroing the first 44 and second 45 accumulating adders.

The device works as follows

When the device is turned on, the aperture of the converter 4 is located in the center of the photocathode, where the image of the object is designed, since the voltages at the outputs of multipliers 2 and 3, the control photo converters 4, are equal to zero at the first time instant. The appearance at the photovoltaic output 4 of the video signal coming through the video amplifier 16 and the adder 13 to the second inputs of multipliers 2 and 3, forms at their outputs quadrature-related voltages that cause the aperture to deviate from the center and scan it along the object contour of the object

To determine the total length of the chord passing through the tracking center, the device implements a radius-vector scan with periodic hopping of the photoconverter aperture at diametrically opposite contour points during tracking. This is achieved by periodically changing the sign of the control pulses of the generator 17 bipolar pulses (GBI) moving the aperture along the contour of the image and let the polarity of the control pulses at the outputs of the GBI at this time be such that the second key 12 and the second memory block 15 are turned off, and the first spanner 11 and the first block memory 14 incorporated ,. the video signal from the first output of the video amplifier 16 passes through the adder 13 to the second inputs of multipliers 2 and 3. At the same time, the first information inputs of blocks 5 and b of the photovoltaic converter transfer receive a video signal from the output of the first key 11B during the presence of a positive polarity pulse on the first output GBI starts ADC 20 in blocks 5 and 6 of moving the photoconverter (Fig. 2), and by the time the polarity of the pulse changes at this output of GBI, a binary code is generated at the output of ADC 20,

corresponding to the scanned image radius

When the polarity of the control pulses is changed, the first key 11 and the first block 14

the memory is turned off, and the second key 12 and the second memory block 14 are turned on, and the video signal of the other polarity C is supplied to the input of the adder 13 from the second output of the video amplifier 16. Since the GBI has two

anti-phase output 38,39 (FIG. 3), the ADC 21 is similarly started. Recording information into accumulating adders 22 and 23 occurs when the input is present

level of logical 1 and only at the moments of transferring the state of the clock input from Log.1 to Log.O. Therefore, with a negative change in the polarity of the control pulses at the first output of the GBI and with

a pulse 42 (FIG. 3) with a duration t at the output of the standby multivibrator 9 (FIG. 1) the binary codes are output from the output of the ADC 20 in the accumulating adder 22. And with a negative change of the polarity of the pulses at the second output of the GBI, the binary codes output from the ADC output 21 in the accumulating adder 23.

With the passage of the signal 37 {fig.Z),

the first output of the generator 1 quadrature

voltage (Fig 1) ya output of the detector 7

zero produced short impulses

 40, 41 (fig.Z), which, when coinciding with

pulses at the output of the standby multivibrator 9 (Fig. 1) pass to the output of the element And 28. These pulses 44, 45 (Fig 3) zero the accumulating adders 22, 23. After t ti - to expire, from the moment of zeroing at the outputs accumulating adders 22, 23

binary codes A and B are formed, corresponding to two areas bounded by the curve of the electrical analogue of the image during the sweep oluperiod from the moment of the disappearance of the output pulse

standby multivibrator 9 accumulating adders 22 and 23 go into storage mode until the next pulse appears at the output of the standby multivibrator 9. During the period T, the presence of Logl on

The control inputs of the group of elements 24 and 25 ensure that the accumulated values of A and B pass to the inputs of the comparison element 26. On the first, second, and third outputs of the comparison element 26 (respectively, Greater, Equal, Less), the signal of Log. 1 appears, depending on the fulfillment of the conditions, A B,

The signals from the outputs of the comparison element 26 are control for the movement mechanism 27. For example, according to the signal of Log. G from the output of the More element 26 of the comparison unit of block 5, the photoconverter 4 is moved along the X axis one step to the right, by the signal of the Log, G from the output Less - to the left, and at the instants of Log. Equally, the movement mechanism 27 stops. The photovoltage transducer 4 moves along the Y axis in a similar way by block b, but with a time delay (ti -t0) / f where r is the pulse duration 42.43 (FIG. 3) of the pending multivibrators 9 and 10 (Fig. 1) . To test the mechanism 27 for moving and synchronizing the elements of the device, the waiting multivibrators 9 and 10 (Fig. 1) form pauses of duration, with T n (ti - to), where n is a natural number. It is possible to choose T as much as ti - to. Thus, the device operates cyclically, with a period ti - to. Upon completion of the centering process, i.e. after the final movement mechanism 27 is stopped, the aperture scanning along the image contour continues, at the outputs of memory blocks 14 and 15 there are different voltage signals of the video signals (one memorized other current) corresponding to the two radii constituting the chord, which are folded in the differential amplifier 18, they form a video signal voltage at its output, which determines the total size of the chord passing through the center of gravity of the image of the object. At the outputs of the detector 19, the extreme chords of the analyzed image are recorded, the values of which do not change later.

The advantage of the proposed device compared to the known one is to ensure the invariance of the result of measuring extreme dimensions and the image of the object by introducing new blocks that align the optical axis of the device with the center of gravity of the image (i.e., provide centering of the image).

Claims (2)

Claim 1. Device for determining the extreme sizes of the image of objects according to the author. No. 1166153, characterized in that, in order to extend the functionality by ensuring the invariance of the result of measuring the extreme dimensions of the image of objects, the first and second waiting multivibrators, the first and second displacement detectors, the first and second information the inputs of which are connected respectively to the outputs of the first and second keys, and the first and second control inputs are connected respectively to the first and second outputs of the generator of bipolar pulses, the fourth pack The main inputs of the first and second motion blocks are connected respectively to the outputs of the first and second standby multivibrators, the inputs of which are combined respectively with the third control inputs of the first and second motion blocks and connected respectively to the outputs of the first and second zero detectors, the inputs of which are connected respectively to the first and the second outputs of the quadrature voltage generator, the moving units are mechanically connected with the photoconverter. 2. The device according to claim 1, wherein the displacement units comprise first and second analog-to-digital converters, first and second accumulating adders, first and second group of elements AND, a comparison element, the element AND, the element NOT and the movement mechanism whose outputs are the kinematic output of the block, and its first, second and third inputs are connected respectively to the first, second and third outputs of the comparison element, the first and second inputs of which are connected to the outputs of the first and second groups, respectively element And, the information inputs of which are connected to the outputs of the first and second accumulating adders, respectively, the information inputs of which are connected to the outputs of the first and second analog-digital converters, respectively, the information inputs of which are the first and second information inputs of the block, the start inputs of the first and second The second analog-to-digital converters are combined with the clock inputs of the first and second accumulating adders, respectively, and are respectively the first and second control inputs. block dam, inputs Zero, the first and second accumulating adders are combined and connected to the output of the element AND, the first and second inputs of which are the third and fourth control inputs of the block respectively, the input enabling the recording of the first and second accumulating adders, the input of the element NOT and the second input element And combined, the output element is NOT connected to the control inputs of the first and second groups of elements I. , g 30  j g  & HS & A 3.5 ri .  i i u f ynp food) rf rw Co I YU h