Dual-Path Eddy Current Probe for Lift-Off Noise Suppression
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Solution Overview
Problem
Eddy current testing is hindered by lift-off distance variations, which cause interference in signal parameters, leading to inaccurate defect detection and quantification, and existing methods struggle to effectively suppress lift-off noise in complex conditions.
Innovation Solution
A dual-path differential probe using a differential bridge and transformer-type conditioning circuit is employed, with excitation and induction units generating differential signals that are processed to eliminate lift-off interference by fusing amplitude and phase parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-frequency excitation method is used, then the testing circuit is simple, but the lift-off noise cannot be effectively suppressed and defect information is masked
Solution Approach 1:
The patent employs multi-frequency periodic excitation signals instead of single-frequency excitation. By using multiple frequency components in the excitation signal, the system can differentiate between lift-off noise and defect signals through frequency-domain analysis, thereby suppressing lift-off noise without significantly increasing circuit complexity
Solution Approach 2:
The patent performs preliminary signal processing by pre-calculating and storing frequency response characteristics for different lift-off distances. During actual testing, these pre-computed characteristics are used to compensate for lift-off effects, enabling effective noise suppression before the defect detection stage
2Measurement precision
If parameter adjustment is performed to compensate for lift-off, then testing accuracy improves, but the system becomes complex and requires frequent calibration
Solution Approach 1:
The patent implements self-service by having the system automatically identify and compensate for lift-off effects using the multi-frequency signal characteristics. The system performs self-calibration by analyzing the frequency response patterns to determine lift-off distance and automatically adjusting the evaluation criteria, eliminating the need for manual parameter adjustment and external calibration equipment
Solution Approach 2:
The patent employs feedback mechanisms where the system continuously monitors the frequency response characteristics and uses this information to dynamically adjust the defect detection criteria. The feedback loop allows the system to adapt to changing lift-off conditions in real-time, maintaining high measurement precision without requiring manual intervention
3Adaptability or versatility
If the probe operates in high lift-off conditions, then the testing range increases, but the signal quality deteriorates and defect detection becomes unreliable
Solution Approach 1:
The patent changes the excitation signal parameters by using multi-frequency components instead of a single frequency. This parameter change allows the system to maintain adequate signal quality across a wider range of lift-off distances, as different frequency components can penetrate varying air gaps effectively, thereby expanding the testing range while preserving measurement precision
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
Enhances testing capability for defects by suppressing lift-off effects, improving accuracy and reliability without requiring parameter adjustments, and enabling deeper defect detection.
Implementation Method 1
apply an alternating current at the end of the excitation coil, thus generating an alternating magnetic field
Implementation Method 2
the induction unit couples with the excitation unit to form a transformer conditioning circuit
Data Source
AI summary
An eddy current testing circuit, method and system, a storage medium, and a terminal belong to the technical field of eddy current non-destructive testing. A dual-path differential probe is formed mainly by combining a differential bridge and a transformer conditioning circuit, and relationships between amplitudes, phase parameters and lift-off respectively generated under alternating magnetic fields are analyzed by using signal parameters generated by a first differential signal and a second differential signal under respective alternating magnetic fields. Multi-parameter signal fusion is performed, so that the lift-off can be suppressed, and dual-path differential output achieves a high testing capability for defects under high lift-off change.