Ultrasonic Guided Waves-Based Monitoring of Rail Head: Laboratory and Field Tests
Figure 3
Typical waveforms detected by the hybrid laser/air-coupled transducer system. Time waveforms detected by the (a) rear and (b) front sensors when the inspection system is probing a pristine rail section. Time waveforms detected by the (c) rear and (d) front sensors when the inspection system is probing a transverse surface notch. Time waveforms detected by the (e) rear and (f) front sensors when the inspection system is probing a joint.
