SU1675146A1 - Device for inspection tracks for defects - Google Patents

Abstract

The invention relates to non-destructive testing methods and can be used to detect defects in rails. The purpose of the invention is to increase reliability. This goal is achieved by analyzing the signal from sensor 14 through analog-digital converter 7 to the shift register 8. when filled, the correlator 9 turns on, which calculates the value of the current correlation coefficient between the array of numbers stored in register 8, and the numbers recorded in block 4 of the formation of the reference signals. If the correlation coefficient is exceeded by a predetermined threshold level, the threshold unit 10 is triggered and, according to its signal, the information is copied to the accumulator 11 with a signal proportional to the correlation coefficient 1 Il.

Description

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The invention relates to non-destructive testing methods and can be used to detect defects in rails.

The purpose of the invention is to increase reliability.

The drawing shows a block diagram of the device.

The device contains a counter 1, the output of which is connected to one of the inputs of correction unit 2, the outputs of which are connected to one of the inputs of block 3 of the memory of reference signals, to another input of which one of the outputs of block 4 of generating reference signals is connected, the sensor 5 of the path, the output of which connected to one of the inputs of the clock generator 6, one of the outputs of which is connected to one of the inputs of the analog-digital converter 7, the output of which is connected to the input of the shift register 8, one of the outputs of which is connected to one of The correlator's s 9, the output of which is connected to the threshold unit 10, one of the outputs of which is connected to the accumulator 11. whose output is connected to the second input of the correction unit 2, and the second output of the register 8 is connected to the input of the information signal storage unit 12, one of the outputs which is connected to the recorder 13, and the magnetic sensor 14 is connected to the second input of the analog-digital converter 7.

The device works as follows.

The operation starts with a start signal, which zeroes the counter 1. At the same time, a start signal of the correction unit 2 appears at its output. Based on the previous measurement data collected in accumulator 11, a signal standard is formed and sent to memory unit 3 of the reference signals of the vehicle-detector. Interval sensor 5 path produces a pulse start generator 6 of a sequence of clock pulses, which synchronize the operation of analog-digital converter 7. The analyzed signal from the magnetic sensor 14, converted to digital form, is fed to the register 8. As soon as the register 8 is filled, the correlator begins 9, which calculates the value of the current correlation coefficient between the array of numbers stored in register 8 and the numbers recorded in block 4 of the generation of reference signals. If the correlation coefficient exceeds a predetermined threshold level (this corresponds to the presence of a signal from a defect), threshold block 10 is triggered and, according to its signal from the first output, the data array corresponding to the alleged defect is copied to block 12, and by the signal from the second output of the threshold block the signal from the alleged defect is rewritten to accumulator 11 with a weight proportional to the correlation coefficient. Simultaneously with recording the signal in the accumulator, the waveform of the defect signal is recorded on the recorder 13, which is controlled by unit 12. This allows for further laboratory analysis of the measurement data. Counter 1 is used to count the recorded pulses of signals from a dangerous defect, and if the volume

The collected material becomes sufficient for statistical processing, then the counter 1 signal triggers a correction block 2, which changes the structure of the reference signal with regard to previous measurements. Changing the structure of the reference signal can also be carried out manually according to the results of laboratory studies from the registrar 13.

With the relative simplicity of the sensor gauges, this device makes it possible to increase the probability of correctly detecting a defect, depending mainly on the potential of the correlation processing method. A device designed for the maximum movement speed of a flaw detector car up to 90 km / h with a resolution along the way of 0.5 mm was developed as a sample. At the same time, 200 discrete values of the current signal from the finder sensor are examined. The device allows the detection of up to 30 different defects without changing the overall structure of the device by parallel inclusion of registers storing

0 signal standards.

Claims (1)

Claims device for flaw detection of rails containing an inductive sensor installed in an automatic non-defectoscope and connected to the rails, the output of which is connected to one of the inputs of the analog-digital converter whose output is connected to the input of the shift register l one of the outputs of which are connected to one of the inputs of the correlator, one of the outputs of which is connected to the threshold unit, the sensor of the path, the output of which is connected to the input of the clock generator, the unit with a set of reference signals, the outputs of which are connected to the other inputs of the correlator, unit the memory of information signals and the recorder, characterized in that, in order to increase reliability, it is equipped with a unit for generating reference signals the accumulator, the correction unit of the signals, the other outputs of which are connected by a counter, one of the outputs being clocked to one of the inputs of the memory block of such a generator is connected to another input / output signal, the other output of the analog-digital converter, the other correlator is connected to the fourth input - to the third input of the correlator, the other 5 do accumulators, the outputs of which are connected to the outputs of the shift register are connected to one of the inputs of the correction unit. one of the inputs of the memory block whose information-outputs are connected to other on-signal signals, one of the outputs of which the inputs of the memory block of reference signals are connected to the recorder, others - to the other to the other input is connected to the output of counters from the accumulator inputs, to another input 10 ka, the input of which is connected to the second output one of the outputs of the threshold of the threshold unit, the third output of the booster unit, to the third input - one of which is connected to the second input of the output unit of the unit forming the reference information in 15