SU785795A2 - Device for detecting distorted flat top of a pulse - Google Patents

Description

The invention relates to electrical measuring equipment and can be used in scanning photoelectric detectors of defects in moving materials. According to the main auth. No. 557331, a device for detecting distortions of a flat top of a pulse is known, comprising a signal amplitude regulator unit whose input is connected to the device input, an input of the second amplitude limiter, and an input of a control pulse shaping unit, the output of which is connected to the input unit of the strobe pulse generation unit, output signal connected to the first input of the coincidence unit, the output of which is connected to the input of the stop pulse generator, and the second input to the output of the comparison unit, the first input of which is connected to the output of the second Comparison unit, and its first input is connected to the output of the second amplitude limiter, and the second input is connected to the output unit of the pin value of the signal, the first input of which, through the first amplitude limiter, is connected to the output of the signal amplitude adjustment unit, and block size the peak value of the signal whose input is connected to the output of the stop pulse generator IJ. However, using this device, it is impossible to record the sequence number of a distorted pulse, measure and record the relative magnitude of the decline of the flat top of the pulse inside the pulse sequence under study. The aim of the invention is to expand the functionality. This is achieved by the fact that a device for detecting distortions of a flat tip of a pulse contains a signal amplitude adjustment unit whose input is connected to the device input, an input of the second amplitude limiter and an input of a control pulse shaping unit, the output of which is connected to the input of the strobe pulse shaping unit, connected to the first input of the coincidence unit, the output of which is connected to the input of the stop pulse generator, and the second input - with the output of the comparison unit, the first input of which is connected to the output The second amplitude limiter, and the second input - with the output of the block of the peak value of the signal, the first input of which through the first amplitude limiter is connected with the output of the signal amplitude adjustment block, and the second input - with the output of the block of the peak value of the signal, whose input is connected to to the output, a generator of stop pulses, equipped with two pulse counters, a recording unit and a trigger, the first input of which is connected to the output of the control pulse shaping unit, the input of the first counter pulses and setting the zero of the second pulse counter, the second input - with the output of the pulse generator, stopping and the input of the second pulse counter, and the output - with the input of the registration unit registration, the first input of which is connected to the output of the first pulse counter, and the second input - with the output of the second pulse counter.

The drawing shows the structural electrical circuit of the device. The proposed device consists of a signal amplitude adjustment unit 1, a first amplitude limiter 2, a block 3 in the peak value of the signal, a 4 bit discharge block in the signal, a second amplitude limiter 5, the compare unit 6, a block 7 Control pulses, a strobe-pulse shaping unit 8, a coincidence unit 9, a generator 10, a stop pulse, a trigger 11, a first pulse counter 12, a recording unit 13 and a second pulse counter 14.

The device works as follows.

The investigated pulse sequence, some pulses of which have a flat top falling, is fed to the inputs of the signal amplitude adjustment unit 1, the second amplitude limiter 5, and the control pulse shaping unit 7. The output pulses of block 1 adjust the amplitude of the signal to the input of the first amplitude limiter 2. which transmits pulses of one polarity to the input of block 3 to extract the peak value of the signal. Block 3 produces a reference voltage equal to the peak value of the pulse received at its input. This voltage is fed to the second input of the comparison block 6, and the first input of which is through the second amplitude limiter (the charge 5 serves the studied pulses of the same polarity. With the help of block 1, the reference voltage is set so that the amplitude of the undistorted signal is close to the value of the reference signal and exceeded it. Comparative unit 6 compares the amplitude of the reference voltage with

the current value of the amplitude as the pulse passes.

The control pulse shaping unit 7 generates pulses located at the beginning and end of the flat top of the undistorted pulse, which are fed to the strobe pulse shaping unit 8. This unit generates a strobe pulse with steep edges that arrive at the first input of the coincidence unit 9, the second input of which receives pulses from the comparison unit 6. Block 9 in the absence of both impulses outputs a pulse whose leading edge triggers the generator 10 stop pulses. Short pulses from the generator 10 are fed to block 4, which, at the moment of action of these pulses, leads to zero the reference voltage on block 3 and prepares block 3 to select the next maximum value of the input signal.

The positive pulses from the output of the forming unit 7 are set to zero by the counter 14 and are counted by the counter 12, therefore the content of the counter 12 corresponds to the number of test pulses arriving at the device input. The pulses from the output of the generator 10 are fed to the counter 14, which counts their number during the duration of the input test pulse, and to one input of the trigger 11. The trigger 11 when the first pulse arrives from the generator 10 enters another state, and the negative pulses from block 7 return it is in its original state. In this case, the output of the trigger 11 creates a pulse, the decay of which triggers the block 13 to register information in the counters 12 and 14.

Block 13 registers the number of a distorted pulse input to the device, and the number of pulses generated by generator 10 during the duration of the input distorted pulse. The number of pulses created by generator 10 and counted by the counter.14 in the case of the input of a pulse device having a flat pulse peaks, proportional to the relative magnitude of the decline.

The invention makes it possible to register the sequence number of a distorted pulse, as well as automatically measure and record the relative value of the cgm of the flat verdiene of the pulse within the pulse sequence being studied.

When using the invention in scanning photoelectric detectors of defects of moving materials, it is possible to record the number of defects with the indication

their coordinates along the length and width of the material and the received information could be processed by the electronic machine for optimal use by controlling the material.

Claims (1)

The invention is a device for detecting flat-top impulses of an impulse according to ed. W 557331, characterized in that, in order to extend the functionality, it is equipped with two pulse counters, a registration unit and a trigger, the first input of which is connected to the output of the control pulse formation unit, the input of the first the pulse counter and the setup input of the second pulse counter, the second input with the output of the stop pulse generator and the input of the second pulse counter, and the output with the registration start input of the registration unit, the first input of which is connected to the output of the first pulse counter, and the second input with the output of the second pulse counter. 0 Sources of information taken into account during the examination 1. USSR author's certificate 557331, .cl. G 01 R.20 / 02, 1974 (prototype).