SU964450A2 - Device for testing measuring instruments with visual presentation of output information - Google Patents

Description

The invention relates to instrumentation and can be used in systems of automatic control of oscilloscopes, measuring amplitude-frequency characteristics and other measuring devices with a visual representation of the output information,

rto main auth. St. 758027 Yu knows a device for controlling measuring instruments with a visual representation of the output information, which contains a control unit, a test signal generator, and a control signal. the input of which is connected to the control unit, and the output to the input of the monitored device, a video signal sensor optically connected to the monitored device, a control results display unit 20 and a signal generator connected to the video signal sensor and to the first input of the control results display unit, the video pulse selector is connected - 25 to the video signal sensor, the control results correction unit, connected to the second input of the display unit, an extreme value detector Q connected in series, connected to the output of a selector. video pulses, a functional converter, the second input of which is connected to a synchronous generator, a differential analyzer and a comparator, to the second input of which a constant generator is connected, while the selector of video pulses, an extreme values detector, a differential analyzer, a comparator and a control display unit are connected to the corresponding the inputs of the correction block, and the control inputs of the video pulse selector, the differential analyzer, the constant generator and the corrector block They are connected to the outputs of the Cl control unit.

Obtaining high metrological characteristics in a known device is difficult due to the imposition on the results of monitoring the low-frequency and high-frequency interference of the video signal sensor and the monitored device. The purpose of the invention is to increase the control accuracy by reducing the influence of interference.

The goal is achieved by introducing an additional generator into the device, the input of which is connected to the output of the extreme values detector, a control input with an additional output of the control unit, and the synchronization input of the additional generator with a synchronous generator, a comparison unit, two integrators, whose inputs connected to the corresponding outputs of the additional generator, and the outputs to the inputs of the comparison unit, the output of which is connected to the input of the functional converter, are connected in series with the zero-in the indicator and coincidence circuit, the second input of which is connected to the first output of the extremum detector, the third to the output of the differential analyzer, the first output to the third input of the correction unit, and the second to the first input of the comparator On; FIG. 1 is a block diagram of the device; in fig. 2 - diagrams that describe the functions of its individual blocks. (with the formation of the lattice functions (sliding window) by an additional generator; biv — window images, respectively, for low-frequency and high-frequency interference). The proposed device comprises a test signal generator 1 connected to a controlled device 2, which is optically coupled to a video signal sensor 3, the output of which is connected to one of the inputs of the video pulse selector 4, a control correction correction unit 5 connected to one of the video pulse 4 selector outputs, connected in series detector & extreme values, the input of which is connected to another output, selector 4 video pulses, additional generator 7 (functions), integrato 8 and 9, comparison block 10, null indicator 11, coincidence circuit 12, functional converter 13 connected to the output of block 10 comparison, differential analyzer 14, the input of which is connected to one of the inputs of the functional converter 13, the control unit 15, connected to one of the inputs of the generator 1 of the test signals, the selector 4, the unit, by its outputs. 5 correction results control, additional generator 7, differential analyzer 14 and serially connected constant generator 16 and comparator 17. The device also contains a synchronous generator 18 connected to the video signal sensor 3, the functional converter 13 and the control results display unit 19, the second of which inputs are connected to the output of the control correction correction unit 5, with the outputs of the extreme values detector 6 and the differential analyzer 14 soybeans, with the inputs of the circuit 12, coincidence one of the outputs of which is connected by the control results correction unit 5, and the other with the input of the comparator 17, the output of which is connected to the corresponding input of the unit, and 5 of the control results correction. The device works as follows. Acting on the test signal generator 1 by means of the control unit 15, the operator sets a controlled image on the indicator of the measuring device 2. This image is projected optically onto the sensitive element of the television sensor 3, which converts the monitored image into a video signal fed to the selector 4 of video pulses. In the selector 4, the video signal is pre-processed — separation of the service signal (impulses corresponding to optical reference points) and useful (image signal) information, as well as suppression of impulse noise differing in amplitude and duration from the service signal and useful signal. At the output of the selector 4, two streams of video pulses are formed, one of which goes directly to the control results correction unit 5 (optical frame signals), and the other to the detector 6 of extreme video signal values (video pulses of the test image). Detector b generates strobe pulses corresponding to the maximum and minimum amplitudes of the video pulses, which allows the amplitude of the video pulses to be distinguished (brightness measurement), the boundaries of contour transitions of contour lines (measurement of contour lines thickness), the midpoints of contour lines. image) and irregularity of the amplitude of the video pulses (flaw detection of the meter screen). Information on the distribution of the amplitudes of video pulses (luminance control) and time intervals corresponding to the boundaries of contrast transitions of contour lines (monitoring the quality of focusing the beam of the measuring instrument screen) comes in corrections, while the strobe pulses of the contour lines together with the sync pulses arrive at the input of the additional generator 7 and one of the inputs of the circuit 12 coincide with From the output of the selector 4, pulses of optical reference frames are fed to the block 5 of the correction of the control results, and the video signal of the control a roll image on the detector 6 extremes. In detector 6, extreme values of video pulses are detected.

corresponding to the distribution of brightness, thickness, and coordinates of the midpoints of the contour lines of the image,. Information about luminance (distribution of video pulses of amarits) and thickness of contour lines (duration of video pulses) is fed to block 5 to correct and form the results of control of luminance and focus quality of the meter indicator. The coordinates of the contour lines in analog or digital form are fed to the input of the generator 7 and the coincidence circuit 12.

The generator 7 forms, in the vicinity of the analyzed point of the image O (the center of gravity of the geometric figure of a given configuration of Fig. 2a), a sliding window (about, the area of integration of lattice functions, aj). Ordinates-if,: the upper and lower regions of the lattice functions (Fig. 2 a) are sent to integrators 8 and 9, where the operation n - m is performed

  / 2iy, - and 2y, - (fl - number of ordinates

is -is-t

lattice functions or a sliding window width indicator).

From the outputs of the integrators 8 and 9, the results of integrating the lattice functions / functions limited to the sliding window area (Fig. 2a) are fed to the comparison unit 10, in which the operation is performed:

s fi rLIv- l:

1S-1

The diagrams (Fig. 2, 5, and) show that the value indicates that the signal at the output of the comparator block 10 is free of low-frequency (harmonic - Fig. 26) and high-frequency random (Fig. 2 c) interference. Random interference (Fig. 2, a and b) and equation (1) do not adversely affect the selection of informative, elements of the test image (extremes of the output signal of block 10).

Through the control unit 15, the operator: can set the sizes of the sliding window (change the value of nj, corresponding to the optimal filtering conditions for low-frequency and high-frequency interference.

The output signal of the comparator unit 10 is supplied simultaneously to the null indicator 11 and the functional converter 13. In the null indicator 10, the time points are fixed corresponding to the signal transition of the unit 10 through zero and strobe pulses are generated, which are fed to the coincidence circuit 12.

In the functional converter 13, the output signal of the block 10 is converted into finite differences (increments D5) for the adjacent raster lines of the television sensor 3.

The differential analyzer 14 generates strobe pulses corresponding to the extremes of the monitored image, according to the results of the change in the sign of the increment L5, which also arrive at the coincidence circuit 12.

As a result of the coincidence of the signals. From the outputs of the detector b of extreme values, the null indicator 11 and the differential analyzer 14, the output of the circuit 12 separates the informative elements of the approximated image of the test object — maxima, inflection points and angular transitions. Coordinates of informative elements (control points)

The analyzed image from the output of the coincidence circuit 12 is fed to the control results correction block 5 for processing.

The operation of the differential analyzer 14 is controlled by the operator through the control unit 15, by means of which the operator also sets the programs for the operation of the selector 4, the unit 5 for the correction of control results, the generator 7 for functions and the generator 16 for the constants.

In the generator ator 16 of the constants, conditions (a set of fixed or variable by the operator stresses) are set. By means of block 15, as well as digital values of the constants, the selection of the singular points of the approximated image of the control object corresponding to the (standard) amplitude-time parameters of the test

40 signal generator 1.

Using the generator of 16 constants, the operator can move marker (reference) points over the image of the test signal on the screen of the block 19 indicator.

The coordinates of the standard and marker points are extracted in the comparator 17 according to the coincidence of the time or amplitude values of the constants With the current coordinates of the approximated image, and the input to the circuit 12.

Informing information about specific, predetermined, control points is transmitted to block 5 for correction of control results.

Claims (2)

In pea 4 tk block 5, the true values of the line thickness, brightness and coordinates of the optical reference points (reference image, optically aligned with the display screen of the measuring instrument) are recorded. The data on line thickness, optical density and optical reference coordinates read by the television sensor 3 are compared in block 5 with the true values of the listed parameters and error signals are generated (set of correction factors). Based on the received signal, the useful information (thickness of lines, brightness and coordinates of information elements of the image being monitored) is corrected, and the result of the correction is displayed on the display screen of the display unit 19 or entered into a computer for further processing. Block 5 stores (entered by the operator through control block 15) also scale factors for recalculating the geometric characteristics of the test object into electrical (voltage, power, frequency, etc. test signals) and tolerances for deviation of the corresponding parameters of the measuring device 2. The results of the tolerance control of the measuring device 2 are transferred to the display unit 19 and are documented with, Using blocks 5 and 19, the implementation of the editing process (erasing and finishing of the image elements) of the control results presented in visual form is possible. Block 19 performs the functions of online display and documentation of control results. Synchronous operation of block 19, television sensor 3, generator 7, and functional converter 13 is provided by a synchronous generator 18. Thus, the introduction of functions, integrators, a comparison unit, a null indicator, and a matching circuit into the generator device - to increase the accuracy of the control of measuring instruments with a visual representation of the output information due to the implementation of special processing of image signals corresponding to the control object, which allows to compensate for low-frequency (harmonious high frequency random noise, with high accuracy select informative picture elements in the presence of noise. The invention The device for the control of measuring devices with a visual representation of the output information on the author. St. 758027, characterized in that, in order to improve the control accuracy, an additional generator is introduced into it, the input of which is connected to the output of the extreme values detector, the control input to the additional output of the control unit, and the input of the additional generator synchronization, to the synchronous generator, the comparison unit, two integrators, the inputs are connected to the corresponding outputs of the additional generator and the outputs are connected to the inputs of the comparison unit, the output of which is connected to the input of the function converter, are connected in series These are the null indicator and coincidence circuit, the second input of which is connected to the first output of the extreme values detector, the third to the output of the differential analyzer, the first output to the third input of the correction unit, and the second to the first input of the comparator. Sources of information taken into account during examination 1, CCC certificate of authorship on application 2691221 / 18-10 c. C: 01 D 18/00, 01.11.78. H at / yf at at at