Phased Array Probe Calibration for Square Bar Inspection
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Solution Overview
Problem
Calibrating phased-array systems for square bar inspections is challenging due to the lack of rotational symmetry, leading to complex movement mechanisms and positioning errors during in-line inspection, which complicates the calibration of shear wave beam sensitivities.
Innovation Solution
A calibration method involving a longitudinal square bar with parallel linear notches across its testing surface, where the bar is passed through the probe, allowing for adjustment of each inspection beam's echo amplitude to be substantially equal, and a software module automatically adjusts the gain to achieve equilibration, using a known standard reflector to set the baseline amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If translation movement mechanism is used to move PA probes for calibration, then calibration can be performed, but the mechanism becomes very complex and introduces positioning errors through backlashes
Solution Approach 1:
Instead of moving the PA probes along the square bar for calibration, the patent inverts the approach by rotating the square bar while keeping the probes stationary. This eliminates the need for complex translation mechanisms and their associated positioning errors, while achieving the same calibration objective through rotational movement.
2Adaptability or versatility
If PA probes are arranged equally around the square bar, then inspection coverage is achieved, but the calibration mechanism becomes very complex
Solution Approach 1:
The patent maintains the equal arrangement of PA probes around the square bar for comprehensive inspection coverage, but eliminates the complex calibration mechanism by inverting the calibration approach: instead of translating probes, the square bar is rotated in place, allowing each probe to be calibrated by the passing flaws without requiring probe movement.
3Measurement precision
If translation mechanism is used for probe movement, then calibration can be performed, but positioning errors are introduced through backlashes
Solution Approach 1:
The patent eliminates positioning errors by inverting the calibration mechanism: instead of translating PA probes (which introduces backlash errors), the square bar is rotated while probes remain stationary. This ensures high positioning accuracy while achieving the same calibration objective of detecting flaws at different positions.
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 method simplifies the calibration process by ensuring equal echo amplitudes for each beam, reducing positioning errors and improving the accuracy of shear wave inspections on square bars, while maintaining the same size and shape as the target bars.
Implementation Method 1
shear waves (shear wave) are often used to inspect the zones on and under the bar surface (subsurface)
Implementation Method 2
the echo amplitude for each inspection beam of the phased array probe received from each notch
Data Source
AI summary
Disclosed is a system and method suitable for calibrating a phased array system configured to inspect square bars. A square bar is provided with an array of parallel linear notches across the full range of the testing surface of the square bar for this calibrating purpose. The square bar is passed through the probe in probe's passive direction during the calibration. The phased array system is adjusted and calibrated so that the echo amplitude for each inspection channel of the phased array probe received from each notch is substantially equal. Then a known flaw with a typically expected flaw's size and shape is created on the same testing surface so that the system's sensitivity is adjusted using the amplitude of the echo signal from the known flaw as a baseline.