Multi-Element Ultrasonic Transducer for Near-Surface Wall Thickness
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Solution Overview
Problem
Existing ultrasonic transducers face challenges in accurately measuring wall thicknesses, particularly in non-uniform corrosion or erosion surfaces, due to limitations in the near zone and beam spread, which affect detection reliability and accuracy.
Innovation Solution
A multi-element ultrasonic transducer with smaller crystals arranged in a cylindrical housing, operating in both pulse-echo and pitch-catch configurations, and equipped with thermocouples for temperature compensation and magnets for consistent attachment, enhances detection accuracy by reducing the near zone and increasing beam spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single large crystal is used in the ultrasonic transducer, then the transducer size is reduced, but the near zone length increases and beam spread decreases, reducing measurement resolution and detection probability
Solution Approach 1:
The patent divides a single large crystal into multiple smaller crystals arranged in an array. This segmentation allows the transducer to achieve both compact size and improved measurement resolution by reducing the near zone length and increasing beam spread through the combined action of multiple small elements rather than one large element.
2Device complexity
If a single large crystal is used in the ultrasonic transducer, then the transducer structure is simplified, but the probability of detecting defects in non-uniform corrosion surfaces decreases
Solution Approach 1:
By segmenting the transducer into multiple small crystals, the patent increases the probability of detecting defects on non-uniform surfaces. The multiple elements provide varied beam angles and paths, increasing the likelihood that at least one crystal will detect corrosion or erosion defects that a single crystal might miss.
Solution Approach 2:
The patent combines the signals from multiple crystals to achieve improved detection reliability. By merging the detection capabilities of multiple small crystals, the system overcomes the limitations of individual elements and achieves higher overall probability of detection while maintaining manageable structural complexity.
3Measurement precision
If smaller crystals are used in the ultrasonic transducer, then the near zone length is reduced and beam spread increases, but the number of crystal elements increases
Solution Approach 1:
The patent accepts the increased number of crystal elements as necessary to achieve the desired measurement precision. The segmentation into multiple small crystals is the primary means by which the patent reduces near zone length and increases beam spread, and this increased element count is the trade-off accepted to achieve superior near-surface resolution and detection capability.
4Device complexity
If temperature compensation is not implemented, then the transducer structure is simpler, but measurement accuracy decreases due to sound velocity variations
Solution Approach 1:
The patent implements temperature compensation using thermocouples that provide feedback on temperature conditions during measurement. This feedback mechanism allows the system to adjust for sound velocity variations caused by temperature changes, thereby maintaining high measurement accuracy without requiring an overly complex transducer structure.
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
Improves the probability of detecting defects and measuring wall thicknesses with higher resolution and accuracy, especially in non-uniform surfaces, reducing the risk of infrastructure failures.
Implementation Method 1
A multi-element ultrasonic transducer includes a plurality of piezoelectric crystals disposed in the cylindrical housing in a circular configuration
Implementation Method 2
Ultrasonic transducers generate high-frequency sound waves that penetrate materials and reflect back toward the transducer revealing hidden flaws
Implementation Method 3
The ultrasonic transducer can include thermocouples to compensate for sound velocity differences dependent on the temperature of the surface being measured
Implementation Method 4
The ultrasonic transducer can include magnetic areas to magnetically attach the ultrasonic transducer to the surface it is measuring
Data Source
AI summary
Systems and methods for measuring wall thicknesses include an ultrasonic transducer including a cylindrical housing defining a sensing plane at an end of the cylindrical housing; and a plurality of piezoelectric crystals disposed in the cylindrical housing in a circular configuration with a face of each piezoelectric crystal coincident with the sensing plane, each piezoelectric crystal being operable to transmit and receive ultrasonic waves.