Laser Resonant Acoustic Spectroscopy for High-Throughput Metamaterial Testing
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Solution Overview
Problem
Current methods for characterizing the dynamic properties of microscale metamaterials are limited by low-throughput, destructive, and contact-based techniques, which hinder the understanding of their dynamic responses and multifunctional applications.
Innovation Solution
A non-destructive and non-contact optical framework using laser-induced resonant acoustic spectroscopy (LIRAS) to measure dynamic elastic properties and wave propagation by photoacoustic excitation, enabling high-throughput characterization of metamaterials through elastic standing waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact-based characterization techniques (e.g., nanoindentation, split-Hopkinson pressure bars) are used to measure dynamic properties of microscale metamaterials, then measurement capability is achieved, but throughput is low and the process is destructive
Solution Approach 1:
The patent replaces contact-based mechanical measurement systems (nanoindentation, pressure bars) with a non-contact optical system using laser-induced resonant acoustic spectroscopy. The laser excites elastic waves in the material and optical detectors measure the vibrational response, eliminating mechanical contact while maintaining measurement capability for dynamic elastic properties and wave propagation characteristics
Solution Approach 2:
The patent utilizes mechanical vibration by exciting elastic standing waves in the metamaterial samples through laser-induced photoacoustic effects. By measuring the resonant frequencies and vibrational modes of the samples, the system extracts dynamic elastic properties and wave propagation measurements without requiring slow, sequential contact-based testing
2Measurement precision
If contact-based measurement techniques are used, then dynamic properties can be extracted, but the measurement process is destructive and time-consuming
Solution Approach 1:
The patent replaces sequential mechanical testing with parallel optical measurement. Multiple samples can be characterized simultaneously using the laser-based vibrational spectroscopy system, reducing data acquisition time while maintaining the ability to extract dynamic elastic properties and wave propagation measurements
Solution Approach 2:
The patent applies laser-induced photoacoustic excitation to simultaneously initiate vibrational responses in multiple samples or multiple measurement locations. This preliminary simultaneous excitation allows parallel data collection, eliminating the sequential nature of contact-based methods and significantly reducing total measurement time
3Adaptability or versatility
If conventional characterization methods are used, then some dynamic regime data can be obtained, but the methods are limited to specific conditions and cannot achieve high-throughput
Solution Approach 1:
The patent creates a universal characterization platform that can measure multiple dynamic properties (elastic moduli, damping ratios, wave speeds, anisotropy) across different frequency regimes using a single laser-based system. The optical detection method adapts to various sample types and geometries, providing versatile dynamic characterization without requiring multiple specialized contact-based test setups
Solution Approach 2:
The patent changes the measurement parameter from static mechanical contact to dynamic optical detection of vibrational modes. By sweeping through different laser excitation frequencies and analyzing the resonant response, the system accesses multiple dynamic regimes simultaneously, achieving both broad adaptability and high throughput through non-contact optical spectroscopy
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-throughput, non-destructive measurement of dynamic elastic properties and wave propagation in metamaterials, allowing for omnidirectional stiffness, damping property measurement, and defect quantification, facilitating advanced material discovery and design.
Implementation Method 1
laser-induced resonant acoustic spectroscopy (LIRAS) technique, which includes a pump module to excite elastic standing waves within the micro-scale material
Implementation Method 2
laser-induced resonant acoustic spectroscopy (LIRAS) technique, which includes a pump module to excite elastic standing waves within the micro-scale material
Implementation Method 3
a probe module that includes a phase-mask interferometer
Data Source
AI summary
Systems, devices, and methods for measuring the dynamic properties of metamaterials at the microscale are provided. For example, laser-induced resonant acoustic spectroscopy (LIRAS) can be used as a non-destructive and/or non-contact optical framework within a material of interest to measure photoacoustic excitation of elastic waves. The system can include a pulsed-laser-based mechanical characterization technique that emits lasers at the sample of interest from various directions to demonstrate a high-throughput non-contact framework that employs MHz-wave propagation signatures to create a vibrational response. The vibrational response of the sample of interest can be used to extract dynamic mechanical properties thereof, such as omnidirectional elastic information, damping properties, and defect quantification. In some embodiments, the LIRAS technique can be employed in a characterization module within an additive manufacturing system to measure parameters of printed parts.