Electromagnetic Double-Wave Transducer for Wave-Speed and Thickness Detection
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Solution Overview
Problem
Existing ultrasonic inspection methods struggle to accurately distinguish between changes in ultrasonic wave speed and part thickness, leading to errors in high-precision inspections, particularly in bolt tension detection, due to the inability to simultaneously generate both longitudinal and transverse waves on the surface of the testing part.
Innovation Solution
An electromagnetic ultrasonic double-wave transducer comprising a shell, permanent magnet assembly, coil, shielding layer, and wire, which can simultaneously generate longitudinal and transverse waves on the surface of a testing part, avoiding errors caused by piezoelectric transducers and electromagnetic transducers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If piezoelectric ultrasonic transducers are used to generate ultrasonic waves, then ultrasonic waves can be generated on the surface of the part to be tested, but the measurement precision deteriorates due to the inability to simultaneously generate both longitudinal and transverse waves, leading to errors in distinguishing between wave speed changes and thickness changes
Solution Approach 1:
The electromagnetic ultrasonic transducer is divided into two independent electromagnetic excitation systems: a first electromagnetic transducer for generating longitudinal waves and a second electromagnetic transducer for generating transverse waves. Each transducer has its own coil and permanent magnet assembly, allowing independent control and excitation of different wave modes simultaneously on the same testing part surface.
Solution Approach 2:
The electromagnetic ultrasonic transducer system is designed to perform multiple functions simultaneously: generating both longitudinal and transverse ultrasonic waves on the surface of the testing part, measuring material properties, detecting defects, and assessing stress. This multi-functional capability eliminates the need for separate transducers for different wave modes.
2Measurement precision
If electromagnetic ultrasonic transducers are used to generate ultrasonic waves, then measurement precision improves by eliminating piezoelectric wedge and couplant time delays, but the device complexity increases due to the need for separate transducers to generate both longitudinal and transverse waves
Solution Approach 1:
The patent combines two electromagnetic transducer systems into a single integrated electromagnetic ultrasonic transducer device. The first and second electromagnetic transducers are positioned adjacently on the same testing part surface, sharing common structural elements such as the shell, permanent magnet assemblies, and excitation circuits, thereby reducing overall device complexity while maintaining the ability to generate both wave modes.
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
The transducer improves detection precision by accurately measuring material properties, defects, and stress by simultaneously exciting longitudinal and transverse waves, reducing measurement errors and enhancing inspection accuracy.
Implementation Method 1
a coil, a shielding layer, and a wire which are provided in said shell... One end of said wire is connected to said coil, and the other end is connected to power supply and signal plug
Implementation Method 2
Said permanent magnet assembly comprises a first permanent magnet and a second permanent magnet sleeved on the first permanent magnet. The magnetizing directions of the first permanent magnet and the second permanent magnet are perpendicular to the bottom of said shell, and the magnetic field directions of said first permanent magnet and the second permanent magnet are opposite
Implementation Method 3
An electromagnetic ultrasonic double-wave transducer, comprising a shell, and a permanent magnet assembly, a coil, a shielding layer, and a wire which are provided in said shell
Data Source
AI summary
An electromagnetic ultrasonic double-wave transducer includes a shell (1), and a permanent magnet assembly, a coil (4), a shielding layer (5), and a wire (6) which are provided in said shell (1); said coil (4) is fixed on the bottom of said shell (1) and is located below said permanent magnet assembly; said shielding layer (5) is arranged between said permanent magnet assembly and said coil (4); one end of said wire (6) is connected to said coil (4) while the other end thereof is connected to the power supply and signal plug (7); said permanent magnet assembly includes a third permanent magnet (12) and a fourth permanent magnet (13); the upper end faces of said third permanent magnet (12) and said fourth permanent magnet (13) realize magnetic circuit closing by means of a magnetic circuit closing element (8).