Ultrasonic Inspection System for Multilayer Structures
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Solution Overview
Problem
Conventional ultrasonic inspection systems operate over a narrow range of frequencies and amplitudes, limiting the types of transducers and test materials that can be inspected, and struggle with complex ultrasonic energy reflections in multilayer structures due to interference, making it difficult to detect distinct time reflections.
Innovation Solution
An ultrasonic inspection system that delivers a chirp pulse sweeping through a wide bandwidth, performs frequency domain processing to identify distinct layers, and time domain processing to compress overlapping reflections, allowing for the display of frequency resonance peaks and reflection time peaks, enabling effective inspection of multilayer structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional ultrasonic inspection systems operate over a narrow range of frequencies and amplitudes, then the system complexity is reduced, but the adaptability to different transducers and test materials is limited
Solution Approach 1:
The system employs frequency sweeping (chirp) techniques that vary the ultrasonic frequency over time, allowing the same transducer to effectively inspect multiple material types and thicknesses. The frequency range is dynamically adjusted to match the resonant frequencies of different materials, providing broad adaptability without requiring multiple specialized transducers.
Solution Approach 2:
The ultrasonic inspection system is designed to perform multiple functions using a single transducer through frequency modulation. The same transducer can inspect different material types (metal, composite, polymer), different thicknesses, and detect various defect types by sweeping through different frequency ranges, making the system universally applicable.
2Adaptability or versatility
If frequency sweeping is used to expand the operating bandwidth, then the adaptability to different materials is improved, but the difficulty of detecting and measuring distinct reflections increases due to interference
Solution Approach 1:
The system extracts distinct reflection signals from the complex overlapping echoes by applying signal processing techniques. Frequency domain analysis (FFT) and time-domain gating are used to separate and identify individual reflections from multi-layer structures, effectively extracting useful information from the interfering signals.
Solution Approach 2:
The system transforms the time-domain overlapping echoes into the frequency domain using Fast Fourier Transform (FFT). This dimensional transformation allows distinct frequency components corresponding to different reflections to be separated and identified, making it easier to detect individual interfaces in multi-layer structures.
3Measurement precision
If conventional narrow bandwidth operation is used, then the measurement precision of distinct reflections is maintained, but the adaptability to varied materials and transducers is reduced
Solution Approach 1:
The system performs preliminary frequency sweeping to identify the resonant frequencies and acoustic properties of the material before conducting the actual inspection. This preliminary characterization allows the system to optimize the frequency range and processing parameters for precise measurement of subsequent reflections.
Solution Approach 2:
The system uses feedback from the received echo signals to dynamically adjust the frequency sweep parameters and signal processing filters. By analyzing the reflected signals in real-time, the system adapts its measurement parameters to maintain precision across different material types and thicknesses.
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 the inspection of a wide range of materials and transducers by delivering ultrasonic energy across varied frequencies and amplitudes, effectively distinguishing between layers and detecting defects through enhanced frequency and time domain analysis.
Implementation Method 1
An ultrasonic inspection system includes ultrasonic transducers to deliver ultrasonic energy to, and detect ultrasonic energy from, the test materials
Implementation Method 2
receiving from the multilayer structure ultrasonic energy including a series of time-overlapping reflections of the pulse delivered to the multilayer structure from layers of the multilayer structure
Data Source
AI summary
A method performed by an ultrasonic inspection system includes delivering to a multilayer structure an ultrasonic pulse that sweeps through a chirp bandwidth, and receiving from the multilayer structure ultrasonic energy including a series of time-overlapping reflections of the pulse delivered to the multilayer structure from layers of the multilayer structure. The method also includes performing frequency domain processing on the ultrasonic energy to produce frequency resonance peaks respectively indicative of distinct layers of the multilayer structure, and performing time domain processing on the ultrasonic energy to compress the time-overlapping reflections into respective time-separated reflection time peaks. The method also includes displaying the frequency resonance peaks on a frequency domain plot, and displaying the reflection time peaks on a time domain plot.