Amplitude

The height or intensity of an ultrasonic signal, measured in decibels or percentage of full screen height. Larger discontinuities typically produce larger amplitude reflections. Amplitude analysis is critical for defect characterization, as it correlates with flaw size and severity. Reference standards with calibrated defects establish baseline amplitude signatures for comparison during inspection. Signal amplitude decreases with material attenuation and distance traveled.

Physical Foundation

Understanding amplitude 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