Transmission (Wave)

The passage of ultrasonic waves through material without significant loss. High transmission efficiency requires good acoustic impedance matching between transducer, couplant, and material. Poor transmission (due to air gaps, rough surfaces, or mismatched impedance) results in weak signals and missed flaws. Maximum transmission is achieved when the transducer is perpendicular to the surface with proper couplant application.

Physical Foundation

Understanding transmission (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