Transient Signal Sampling for Multilayer NDT Phase Reconstruction
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Solution Overview
Problem
Existing non-destructive testing (NDT) methods face challenges in accurately analyzing multilayer structures due to limitations in resolution, depth of penetration, and the need for complex and expensive synchronized signal generation, especially at higher frequencies.
Innovation Solution
A system and method for non-destructive analysis that generates asynchronous electromagnetic waves using correlated clock signals for repetitive equivalent time sampling, allowing for the derivation of phase information and conversion of data samples into synchronous data samples without synchronized signals, using a differential measurement module and processing module to derive geometric and electromagnetic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synchronized signal generation is used for transient radar analysis, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent uses a reference channel to create a copy of the expected signal characteristics, which is then used to synchronize and calibrate the measurement channel. Instead of requiring complex synchronized signal generation across multiple channels, the system captures a reference signal that replicates the timing and frequency characteristics, enabling precise measurement without complex synchronization hardware
Solution Approach 2:
The patent introduces a reference channel as an intermediary element that mediates between the signal generator and the measurement channel. The reference channel captures the actual signal characteristics including any drift or variation, and this reference data is used to correct and synchronize the measurement channel, eliminating the need for complex direct synchronization
2Measurement precision
If frequency is increased to improve resolution, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent transitions from time-domain sampling to frequency-domain analysis by capturing multiple frequency components and using Fourier transform techniques. This dimensional change from temporal to spectral domain allows high-resolution analysis without requiring high-frequency transient signals, thereby avoiding the complexity associated with high-frequency signal generation and synchronization
3Measurement precision
If synchronized multi-channel signal generation is implemented, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The system uses a reference channel to copy the signal characteristics that would otherwise need to be precisely generated and synchronized. By capturing the reference signal and using it for correlation-based synchronization, the system avoids the manufacturing complexity of precision synchronized signal generators while maintaining measurement accuracy
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
Enables high-resolution, quantitative analysis of multilayer structures with reduced costs and improved accuracy by eliminating the need for synchronized signals, providing detailed information about material properties and structure.
Implementation Method 1
repetitive transient signals from reflection of the electromagnetic wave at a test material when the test material is positioned in front of the second transmit antenna
Data Source
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AI summary
The present invention relates to a system for non-destructive analysis of a test material. The system includes an electromagnetic signal generator for generating and emitting an electromagnetic wave of substantially one frequency with a transient part through separate transmit antennas in different channels. A differential measurement module is configured for repetitive equivalent time sampling of transient signals received by corresponding antennas, using correlated clock signals. The system further includes a processing module for determining phase information from reference samples obtained from a reference material and for converting data samples from the test material into synchronous data samples with amplitude and phase information, using the phase information from the reference samples and predetermined operational data of the system. This enables the derivation of geometric information and/or electromagnetic properties of one or more layers of the test material.