SAFT Ultrasonic Defect Detection Using Varied Insonation Angles
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Solution Overview
Problem
Conventional ultrasound defect detection methods using the SAFT technique are limited by the need for wide aperture angles, which reduce signal energy and result in low signal-to-noise ratios, and are restricted to using group radiators and fixed insonation angles, preventing continuous movement of test heads and accurate defect orientation analysis.
Innovation Solution
A method that uses a constant insonation angle varied for each measurement data set, employing SAFT evaluation with a common reconstruction grid to calculate orientation-independent defect display values, allowing for superposition of results and enabling the use of single-oscillator test heads and continuous movement over the test object, while maintaining high signal-to-noise ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wide aperture angle is used to detect reflecting defects, then the spatial resolution and defect detection capability are improved, but the signal energy introduced into the test object decreases and the signal-to-noise ratio deteriorates
Solution Approach 1:
The patent divides the measurement process into multiple measurement series, each acquired from a different measurement position. Each measurement series uses an optimized aperture angle appropriate for that specific position, allowing the system to maintain high signal energy while achieving comprehensive defect detection through the combination of multiple segmented measurements
Solution Approach 2:
The patent adds the dimension of measurement position variation to the traditional SAFT method. Instead of relying solely on aperture angle adjustment at a single position, the system varies both the measurement position and the corresponding aperture angle, creating a multi-dimensional measurement space that resolves the contradiction between spatial resolution and signal energy
2Measurement precision
If a wide aperture angle is used, then the spatial resolution is improved, but the signal-to-noise ratio decreases due to energy distribution
Solution Approach 1:
The patent segments the overall measurement into multiple measurement series, each with optimized parameters for its specific measurement position. This segmentation allows each individual measurement to maintain high signal-to-noise ratio while the combined results achieve high spatial resolution through the SAFT evaluation of multiple positioned measurements
Solution Approach 2:
The patent dynamically changes the aperture angle parameter according to the measurement position. By adapting the aperture angle to each specific measurement position rather than using a fixed wide angle, the system maintains optimal signal energy and signal-to-noise ratio while still achieving the required spatial resolution through the combined evaluation
3Adaptability or versatility
If the insonation angle is varied for each measurement data set with a common reconstruction grid, then the angle range for SAFT evaluation is enhanced and defect orientation analysis is improved, but the measurement and evaluation complexity increases
Solution Approach 1:
The patent implements a dynamic measurement and evaluation process where the insonation angle varies for each measurement data set. The system dynamically adapts the angle parameters according to the specific measurement requirements and defect orientations being investigated, allowing flexible exploration of different angle ranges while maintaining a structured evaluation framework through the common reconstruction grid
Solution Approach 2:
The patent employs an iterative evaluation process where the SAFT evaluation results from measurement series with varied insonation angles are combined using a common reconstruction grid. This feedback mechanism allows the system to refine defect characterization by comparing results from different angle ranges, improving defect orientation analysis while managing complexity through systematic data integration
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the angle range for SAFT evaluation, improves defect detection accuracy by increasing signal-to-noise ratios, and allows for flexible measurement networks and defect orientation analysis, enabling the use of larger transducers and more energy-efficient ultrasound testing.
Implementation Method 1
The testing is preferably carried out by means of ultrasound
Implementation Method 2
the more weakly it is reflected back by defects as an echo sound signal
Implementation Method 3
The SAFT method is known for detecting small defects within the test object and distinguishing them from other defects
Data Source
AI summary
A device and a method for detecting at least one defect in a test object (2). At least one test head (1) radiates an ultrasonic signal at different measuring points (MP) into the test object (2) with each point at an insonation or radiation angle (α) in order to ascertain multiple measurement data sets (MDS). The angle is constant for each data set (MDS). An analyzing unit (4) carries out an SAFT (Synthetic Aperture Focusing Technique) analysis for each ascertained measurement data set (MDS) using a common reconstruction grid (RG) inside the test object (2) in order to calculate an SAFT analysis result for each measurement data set (MDS). The analyzing unit (4) superimposes the calculated SAFT analysis results in order to calculate an orientation-independent defect display value (SRP) for each reconstruction point (RP) of the common reconstruction grid (RG).