Flaw detection system for railroad rails and the like

Details Flaw detection system for railroad rails and the like Flaw detection system for railroad rails and the like

1982-09-22

1984-12-11

Gill, James J.

Measuring and testing

Vibration

By mechanical waves

73631, 73636, G01N 2904

Patent

active

044870710

ABSTRACT:
Rail testing apparatus, particularly useful at the point of manufacture, for detecting flaws in railroad rails. A number of transducers transmit ultrasonic sound waves into a rail under test and receive the associated echo signals. The apparatus advantageously divides the rail into a plurality of measured rail segments and the amount of amplification applied to the associated echo signals may be varied over each rail segment, thus providing the ability to selectively increase or decrease the sensitivity of the testing apparatus. The amplified echo signals are selectively applied to detection apparatus with a positive and negative gating scheme to increase system accuracy and reliability.

REFERENCES:
patent: 4031743 (1977-06-01), Kossoff et al.
patent: 4050292 (1977-09-01), Bloch
patent: 4137776 (1979-02-01), Rudis et al.
patent: 4205553 (1980-06-01), Rudis et al.

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