Helical Guided Wave Beam Steering for Pipe Flaw Detection
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Solution Overview
Problem
Traditional guided wave inspection methods for pipes are limited in detecting flaws, especially when flaws are hidden behind larger ones due to the unfocused nature of wave propagation and the time-consuming point-by-point focusing method, which results in reduced sensitivity and resolution, particularly in pipes with fluid or buried conditions.
Innovation Solution
The method involves emitting ultrasonic waves in a helical pattern from an array of transducer elements, controlling the emission to achieve focused or unfocused beam forming and steering, allowing for improved detection and sizing of flaws by varying the helical angles and using mixed time delay and amplitude control to enhance resolution and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional unfocused guided wave method is used, then the inspection covers the entire circumference, but the wave intensity is low leading to premature dissipation and reduced detection sensitivity
Solution Approach 1:
The patent applies local quality by transitioning from uniform unfocused wave distribution to localized focused wave beams. The phased array transducers create concentrated wave packets at specific circumferential locations and depths, increasing local wave intensity and detection sensitivity while maintaining comprehensive inspection coverage through sequential focusing at multiple positions.
Solution Approach 2:
The patent segments the inspection process into multiple focused beam positions around the pipe circumference. Instead of using a single unfocused wave, the system divides the inspection into discrete focal points, each interrogated by a focused wave packet. This segmentation allows high intensity at each point while collectively covering the entire circumference.
2Reliability
If focused wave method is used, then high intensity ultrasound is achieved at the region of interest, but the inspection becomes point-by-point which is time consuming
Solution Approach 1:
The patent employs periodic action by using pulsed ultrasonic waves with specific time delays between pulses. The phased array transducers emit periodic wave packets at different circumferential positions, allowing the system to maintain high detection sensitivity through focused beams while improving inspection speed by systematically cycling through focal points in an optimized sequence.
Solution Approach 2:
The patent applies preliminary action by pre-calculating and storing the optimal time delays and excitation sequences for all focal positions before inspection begins. This preliminary setup allows the system to rapidly switch between focused beam positions without recalculation delays, maintaining high detection sensitivity while significantly improving inspection throughput compared to real-time focusing.
3Measurement precision
If traditional focusing method with symmetric contribution from all transducers is used, then focused beam is formed, but the method is most sensitive to flaws with circumferential extent and less sensitive to axial flaws
Solution Approach 1:
The patent applies dynamics by making the transducer excitation parameters dynamic and adaptable. The system varies the time delays and amplitude weights of individual transducers based on the desired beam direction and flaw orientation. This dynamic control allows the focused beam to be steered and shaped to optimize detection for different flaw orientations, including both circumferential and axial flaws, rather than being fixed in a single symmetric configuration.
Solution Approach 2:
The patent employs parameter changes by systematically varying the excitation parameters (time delays, amplitudes, frequencies) of the phased array transducers. By changing these parameters, the system can alter the beam formation characteristics to be sensitive to different flaw orientations. The ability to modify excitation parameters in real-time enables versatile detection of both circumferential and axial flaws while maintaining focused beam precision.
4Adaptability or versatility
If hardware settings are changed to shift the point of focus, then the circumferential location of the focal point is changed, but latency of the hardware reduces the speed of shifting focus
Solution Approach 1:
The patent applies preliminary action by pre-computing and storing the optimal excitation sequences and time delays for all possible focal positions and beam directions before the inspection begins. This preliminary preparation eliminates the need for real-time calculation when shifting focus, allowing the system to rapidly switch between focal points by simply retrieving pre-computed parameters, thereby maintaining focal point flexibility while minimizing hardware switching latency.
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 enables the simultaneous detection, location, and sizing of flaws of all orientations without a second stage, providing higher speed and resolution, and can detect hidden flaws by interrogating them from multiple directions, maintaining high intensity and accuracy even in attenuating conditions.
Implementation Method 1
an array of at least two ultrasonic transducer elements that can excite and receive sound or elastic waves in the pipe
Implementation Method 2
receiving reflections of the waves caused by impingement of the waves on the one or more flaws
Data Source
AI summary
A method of inspecting a pipe for flaws includes emitting ultrasonic waves, controlling the emission of the ultrasonic waves, receiving reflections of the ultrasonic waves, and determining at least one characteristic of one or more flaws. The ultrasonic waves are emitted in a helical pattern through the pipe from an array of ultrasonic transducer elements. The emission of the ultrasonic waves from the array is controlled such that the ultrasonic waves are emitted at a plurality of helical angles within a range of helical angles. The reflections of the ultrasonic waves are caused by impingement of the ultrasonic waves on the one or more flaws. The at least one characteristic of the one or more flaws is determined based on the received reflections of the ultrasonic waves.