Gain (Amplification)
The electronic amplification applied to ultrasonic signals to increase their amplitude for better visibility on the display. Gain is typically expressed in decibels and adjusted to bring the back-wall echo to a reference level (80% or 6dB below full screen height). Proper gain setting is critical to avoid missing small flaws (insufficient gain) or false indications (excessive gain). Different materials and thicknesses require different gain settings for consistent inspection results.
The electronic amplification applied to ultrasonic signals to increase their amplitude for better visibility on the display. Gain is typically expressed in decibels and adjusted to bring the back-wall echo to a reference level (80% or 6dB below full screen height). Proper gain setting is critical to avoid missing small flaws (insufficient gain) or false indications (excessive gain). Different materials and thicknesses require different gain settings for consistent inspection results.
Why It Matters
Gain (Amplification) is a critical NDT technique used across multiple industries. Understanding its principles, applications, and limitations is essential for proper inspection planning and execution.
Industry Applications
This method is widely used in oil and gas, aerospace, power generation, manufacturing, and construction industries for detecting discontinuities, assessing material properties, and ensuring component safety.
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
Methods
NDT inspection technique or method
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