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AUTOMATIC LASER ULTRASONICS FOR RAIL INSPECTION - page 4 / 8

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Figure 2. LURI with optical subsystem.

Some optimal source-receiver arrangements are schematically shown in the Fig. 3. The arrangement shown in the Fig. 3a is mainly meant for detection of defects UIC codes 2321, 212, and 211, while the arrangement shown in the Fig. 3b allows better disclosure of defects UIC codes 213 and 221.2. Obviously, both of them enable to disclose complete rail break (defect UIC code 200) by many features of the correspondent ultrasonic waveforms.

gage side

running surface

rail base

source spot

receiver spot

3a 3b

Figure 3. Two optimized source-receiver arrangements for LURI (view from above, not drawn on a scale).

Results obtained in the field test: The LURI software provides a variety of displays, ranging from the data acquisition display to advanced displays of the defects finding and identification software showing ultrasonic waveforms (A-scans), as well as ultrasonic images synthesized by straightening A-scans lengthwise a rail (B-scan). The example of

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