RAIL ULTRASONIC INSPECTION METHOD Russian patent published in 2025 - IPC G01N29/04 

FIELD: measuring.

SUBSTANCE: invention can be used for ultrasonic inspection of rails. An ultrasonic transducer (UST) is placed in a given scanning zone and control operations are carried out, including probing with ultrasonic frequency pulses, recording of reflected signals by means of flaw detector with provision of their visualization in the form of amplitude-time scanning. A time zone corresponding to a given scanning zone is selected on the sweep, the aperture of which is selected from the condition that the probing pulse does not enter it, a signal utility criterion is set, and reflected signals recorded in this time zone are analysed. UST is moved in scanning zone and control operations are repeated. In the allocated time zone, the arithmetic mean value of the amplitudes of the received signals is determined through a step specified by the flaw detector, amplitude N of which is in the range satisfying the condition N ≤ N₁ – N₂, where N₁ is the dynamic range of signals displayed on the flaw detector screen, N₂ is the criterion for qualifying the signal as useful. Signal usefulness criterion is exceeding of its amplitude of this arithmetic mean value by N₂ ≥ 12 dB. Each signal, the amplitude of which exceeds the obtained arithmetic mean value by the value N₂ ≥ 12 dB, in a given scanning area is formed as a result of accumulation due to additional summation of signals taking into account time shift of signals relative to each other, corresponding to movement of UST during scanning, in n scanning cycles, in which the amplitude of the received signals exceeds the level of -6 dB within the boundaries of the main lobe of the beam pattern of the UST. Wherein n = m, where m is the number of maxima of these signals.

EFFECT: providing the possibility of increasing the reliability of ultrasonic testing of rails.

1 cl, 7 dwg