High-Temperature Acoustic Material Property Analysis
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Solution Overview
Problem
Acoustic measurements of material properties in solids face challenges at high temperatures due to worsening signal-to-noise ratio and interference from background vibrations, making it difficult to accurately determine material properties and thermal expansion parameters over a wide temperature range.
Innovation Solution
A method and system that involve heating the test piece to a specific temperature range, capturing background noise signals, and then performing acoustic measurements while accounting for this noise to improve the determination of material properties, using a system with a heating chamber, sensor, and impact system to impart vibrational excitation and capture responses, and analyzing the signals to extract material properties and thermal expansion parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If acoustic measurements are performed at high temperatures, then material properties can be determined at operating conditions, but the signal-to-noise ratio deteriorates due to background vibrations
Solution Approach 1:
The patent applies preliminary action by performing a background measurement before the actual acoustic measurement at high temperature. The background noise signal is captured during a calibration period when no impact is applied, and then this pre-captured noise signal is used to correct the subsequent measurement signal, thereby improving the signal-to-noise ratio.
Solution Approach 2:
The patent extracts the background noise component from the total measured signal. By separating the noise signal (captured during calibration) from the measurement signal (captured during impact), the method isolates and removes the harmful background vibrations to reveal the true material response.
2Measurement precision
If background noise is captured and used for correction, then measurement accuracy improves, but the testing procedure becomes more complex
Solution Approach 1:
The patent merges the background calibration process with the material property measurement process into a single integrated procedure. Both the background noise capture and the acoustic measurement are performed within the same heating chamber using the same sensor and impact system, eliminating the need for separate equipment or procedures.
Solution Approach 2:
The system performs self-calibration by automatically capturing its own background noise characteristics during the measurement process. The same sensor that measures material properties also captures the background noise, and the processing system automatically subtracts the noise from the measurement signal without requiring external calibration equipment or manual intervention.
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
This approach enhances the accuracy of material property analysis at high temperatures by accounting for background noise, improving the signal-to-noise ratio and allowing for reliable determination of material properties and thermal expansion parameters, even at extreme temperatures.
Implementation Method 1
heating the test piece to within a testing temperature range
Implementation Method 2
imparting a vibrational excitation onto the test piece
Implementation Method 3
impart an impact on respective well-defined points on the surface
Implementation Method 4
a sensor configured to capture said mechanical vibratory response as a time-varying signal
Implementation Method 5
determine the frequencies and decay constants of sinusoids making up said time-varying signal
Implementation Method 6
analyse said time-varying signal to determine the frequencies and decay constants of sinusoids making up said time-varying signal
Data Source
AI summary
A method for acoustically measuring material properties of a test piece at high temperatures, includes the steps of: heating the test piece to within a testing temperature range; performing a background measurement within said testing temperature range by capturing a vibrational signal from the test piece within a calibration period, thereby obtaining a noise signal; performing an acoustic measurement on said test piece within said testing temperature range and within a testing period by: imparting a vibrational excitation onto the test piece; capturing a vibrational signal of the test piece within the testing period, thereby obtaining a vibrational response signal to said vibrational excitation, and obtaining the material properties of the test piece by analyzing the vibrational response signal, thereby taking into account the noise signal. A system is provided for acoustically measuring material properties of a test piece at high temperatures.