Compression Wave (Longitudinal Wave)

Ultrasonic wave where particle motion is parallel to the direction of wave propagation, also called longitudinal or P-waves. Compression waves travel at higher velocity than shear waves and are preferred for thickness measurement and detecting laminations. They are excellent for detecting defects perpendicular to the transducer surface. Compression waves are generated by straight-contact transducers.

Physical Foundation

Understanding compression wave (longitudinal wave) is fundamental to effectively applying NDT methods. Many NDT techniques rely directly on these physical principles.

Practical Impact on Inspections

This principle affects equipment selection, test parameters, inspection procedures, and data interpretation. Proper application requires understanding these physics fundamentals.

Best Practices

• Always follow applicable NDT standards and procedures
• Use properly calibrated and maintained equipment
• Ensure personnel are properly trained and certified
• Document inspection procedures and results completely
• Keep current with industry standards and best practices