Dual EMAT-Laser Matrix Scanning for High-Temperature Slab Inspection
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Solution Overview
Problem
Hybrid Laser-EMAT UNDT devices face issues with poor resolution in A-scanning and B-scanning of metallurgical objects due to reliance on a single EMAT receiver, angular masking of wave reflectors, complex configurations leading to high costs, and low signal-to-noise ratio, making them ineffective for continuous C-scan 3D scanning of large-section steel slabs at high temperatures.
Innovation Solution
An agile UNDT device with a dual EMATs/Laser-pulse matrix array, comprising a pulsed laser input source and agile matrix laser transmitter, combined with an EMAT receivers array, to achieve high-resolution scanning by periodically diffracting laser beams into multiple output beams focused on discrete points and using EMAT receivers to capture ultrasonic waves, ensuring efficient detection and characterization of surface and subsurface discontinuities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single EMAT receiver is used in hybrid Laser-EMAT UNDT devices, then the device complexity is reduced, but the measurement precision and resolution in A-scanning and B-scanning deteriorate
Solution Approach 1:
The invention divides the receiver system into multiple EMAT receivers arranged in an array, where each receiver captures ultrasonic waves from different angular positions. This segmentation of the reception function enables precise localization of defect sources through triangulation, thereby improving measurement precision while maintaining manageable device complexity through modular architecture
Solution Approach 2:
The invention transitions from a single-point reception to a distributed array reception system, adding spatial dimensionality to the measurement process. By distributing multiple EMAT receivers across different positions and angles, the system captures ultrasonic wave information from multiple dimensions, enabling accurate 3D localization of defects and significantly improving measurement precision
2Ease of manufacture
If conventional piezoelectric CUNDT technique is used, then the manufacturing cost is reduced, but the reliability and applicability at high temperatures deteriorates
Solution Approach 1:
The invention replaces the mechanical contact-based piezoelectric transducer system with a contactless electromagnetic acoustic transducer (EMAT) system. EMATs generate and detect ultrasonic waves through electromagnetic induction without requiring physical contact or coupling agents, eliminating the temperature limitations of piezoelectric materials and enabling reliable operation in high-temperature metallurgical environments
Solution Approach 2:
The invention changes the operating parameters of the ultrasonic testing system by using electromagnetic induction instead of piezoelectric effect. This parameter change allows the system to operate at high temperatures where piezoelectric materials would fail, while the modular EMAT design keeps manufacturing costs comparable to conventional systems
3Measurement precision
If a dual EMATs/Laser-pulse matrix array is implemented, then the measurement precision and scanning resolution are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The invention segments both the laser pulse emission and EMAT reception functions into multiple discrete elements arranged in matrix arrays. This segmentation enables independent optimization of each element while achieving high overall system resolution through coordinated operation of multiple channels, managing device complexity through modular design
Solution Approach 2:
The invention designs the EMAT array elements to serve multiple functions: they can operate as receivers for ultrasonic waves generated by laser pulses, as well as potentially function as emitters themselves. This multi-functionality reduces the need for separate dedicated components, thereby improving measurement precision without proportionally increasing device complexity
4Reliability
If multiple EMAT receivers are distributed in an array, then the signal-to-noise ratio and defect detection capability are improved, but the device complexity and processing requirements increase
Solution Approach 1:
The invention implements signal processing feedback mechanisms where the outputs from multiple EMAT receivers are continuously monitored, correlated, and processed to enhance the signal-to-noise ratio. By using the signals from multiple receivers in a coordinated feedback processing system, the invention achieves improved defect detection capability while managing processing requirements through efficient algorithms
Solution Approach 2:
The invention merges the signals from multiple EMAT receivers through coherent processing and integration. By combining the information from multiple reception channels in a unified processing framework, the system achieves enhanced signal-to-noise ratio and improved defect characterization while avoiding the need for completely separate processing systems for each receiver
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 device provides high-resolution A-scanning, effective noise elimination, and reliable B-scanning, enabling continuous C-scan 3D scanning of large-section steel slabs at high temperatures, overcoming limitations of prior art by optimizing signal processing and reducing costs.
Implementation Method 1
emission of ultrasonic mechanical vibrations through pulsed laser beams
Implementation Method 2
reception of ultrasonic mechanical vibrations by a multitude of electromagnetic acoustic transducers known as EMATs operating in reception mode
Implementation Method 3
periodically diffracting laser beams into multiple output beams focused on discrete points
Data Source
AI summary
A UNDT Device (1) comprising a dual EMAT/laser-pulse matrix array for scanning ultrasonically and for identifying discontinuities (D) in a conductive metal object (2), which device comprises a) a Pulsed Laser Input Source (4) that produces a Pulsed Laser Input Beam (ILB); b) a Matrix Multi Beams Laser Transmitter comprising i) mechanical Beam-Steering Means (17, 17a) configured to be struck by the Laser Input Beam (ILB) and to periodically diffract it into Secondary Laser Beams (18, 18a, 18b, 18c); and ii) Mechanical Beam-Leaping Means (19) intended to be struck by the Secondary Laser Beams and to periodically diffract them into n Pulsed Laser Output Beams (OLBk) and to focus these onto n Pulse Points (SPk) located at the centre of n Pulse Cells (EPk) of a periodic Laser Pulses Array (LEA); and c) a Receivers Assembly (SE) made up of EMAT Receivers (Emi) that are organised into n Sensors Groups (SGi) that are arranged in n Detection Cells (RWi) of a periodic EMAT Receivers Array (ERA). The Spatial Periodicities (8, 7) and the dimensions (n) of the Laser Pulses Array (LEA) and of the EMAT Receivers Array (ERA) are equal.