Frequency (Ultrasonic)
The number of ultrasonic wave cycles per second, measured in megahertz (MHz). Higher frequencies (5-25 MHz) provide better resolution and sensitivity to small flaws but have limited penetration due to attenuation. Lower frequencies (0.5-2 MHz) penetrate thicker materials and coarse-grained materials better. Frequency selection is a critical inspection parameter determined by material thickness, grain size, and required resolution. The relationship between frequency and wavelength governs spatial resolution.
The number of ultrasonic wave cycles per second, measured in megahertz (MHz). Higher frequencies (5-25 MHz) provide better resolution and sensitivity to small flaws but have limited penetration due to attenuation. Lower frequencies (0.5-2 MHz) penetrate thicker materials and coarse-grained materials better. Frequency selection is a critical inspection parameter determined by material thickness, grain size, and required resolution. The relationship between frequency and wavelength governs spatial resolution.
Physical Foundation
Understanding frequency (ultrasonic) 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
Type
Physics
Physical principles governing NDT
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