Crossed Gradient Induced Current Probe for Heat Exchanger Tube Testing
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Solution Overview
Problem
Current nondestructive testing methods for heat exchanger tubes face limitations in defect detection speed, spatial resolution, and directional sensitivity, particularly with annular and cylindrical magnetic sensor arrays, which can misclassify cracking defects and have limitations in mass production and miniaturization due to mutual interference and complex signal processing.
Innovation Solution
A probe using a crossed gradient induced current with a multi-stage folded induction coil and arrayed magnetic sensors to generate intersecting first and second induced currents, allowing for improved defect detection by measuring amplitude and phase differences, enhancing detection speed and spatial resolution while minimizing directional bias.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If annular and cylindrical magnetic sensor arrays are used for defect detection, then detection coverage is improved, but mutual interference between sensors increases and spatial resolution deteriorates
Solution Approach 1:
The probe is divided into multiple independent detection units, each with its own induction coil and magnetic sensor. These segmented units operate independently to avoid mutual interference while collectively providing comprehensive detection coverage of the heat exchanger tube surface.
Solution Approach 2:
The patent transitions from two-dimensional arrayed sensor configurations (annular/cylindrical) to a three-dimensional probe structure where multiple detection units are arranged in space. This dimensional change allows sensors to be positioned without mutual interference while maintaining comprehensive coverage through spatial distribution.
2Measurement precision
If complex signal processing is used to evaluate defects, then measurement precision is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The induction coil generates induced currents in predetermined directions (axial and circumferential) before defect detection. This preliminary action creates structured current patterns that naturally highlight different defect orientations, simplifying subsequent signal processing and evaluation compared to processing raw, unstructured sensor data.
Solution Approach 2:
The magnetic sensor acts as an intermediary that converts complex electromagnetic field interactions into simplified measurement signals. By measuring magnetic field changes caused by induced currents rather than directly processing complex current distributions, the system reduces signal processing complexity while maintaining defect evaluation accuracy.
3Measurement precision
If rotary probes are used to scan inner surfaces, then defect detection capability is improved, but testing speed decreases and service life shortens
Solution Approach 1:
The patent replaces the mechanical rotary scanning system with a stationary probe design. Instead of mechanically rotating the probe to scan inner surfaces, multiple induction coils and magnetic sensors are arranged to provide comprehensive detection coverage in fixed positions, eliminating mechanical wear and enabling continuous high-speed testing.
4Ease of manufacture
If bobbin-type probes are used for integrity checking, then manufacturing simplicity is maintained, but directional sensitivity deteriorates causing misclassification of cracking defects
Solution Approach 1:
Different detection units within the probe have specialized configurations optimized for detecting specific defect orientations. The induction coils are arranged to generate induced currents in specific directions (axial, circumferential), giving each local detection unit enhanced sensitivity to particular defect types while maintaining overall probe manufacturing simplicity through modular design.
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 solution enables high-speed, quantitative defect evaluation with improved detection capabilities for both axial and circumferential cracking defects, reducing the risk of misclassification and enhancing the probe's spatial resolution and manufacturing efficiency.
Implementation Method 1
When an alternating current (AC) current is applied to a coil adjacent to the target object, an induced current occurs in the target object
Implementation Method 2
an induced current occurs in the target object. When a defect is present in a path of the induced current, a flow of the induced current is distorted
Data Source
AI summary
Disclosed herein are a probe for a nondestructive testing device using a crossed gradient induced current and a method of manufacturing an induction coil for a nondestructive testing device. The probe for a nondestructive testing device using a crossed gradient induced current includes an induction coil formed to have a predetermined width and to generate first and second induced currents in a direction crossing each other when a current is applied from a power supply, and a magnetic sensor part installed adjacent to the induction coil so as to measure the first and second induced currents induced from the induction coil.