Metamaterial Laminate for Strain Mapping and Infection Detection
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Solution Overview
Problem
Current methods for monitoring strain fields in opaque composite materials are inadequate, as they struggle to detect incipient failures and require invasive techniques that can compromise the healing environment, and existing wound infection detection methods are cumbersome and time-consuming.
Innovation Solution
The use of metamaterial laminates with strain-dependent polarimetric responses, embedded with nanofibers and conductive nanoparticles, which can be adhered to or embedded within composite materials to non-destructively map strain fields and detect infections without exposing the wound, using terahertz radiation and wireless data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional optical polarimetric techniques are used to measure photoelasticity, then strain field mapping can be achieved, but the method is problematic due to composite material's opacity and weak refractive index anisotropies at terahertz frequencies
Solution Approach 1:
The patent changes the operating frequency parameter from optical to terahertz range, where composite materials exhibit different optical properties that enable strain field mapping through opaque materials. The metamaterial laminate is designed to operate specifically at terahertz frequencies to exploit this parameter change.
Solution Approach 2:
The patent uses a composite metamaterial laminate structure combining polymer nanofibers with metallic nanofibers and metallic nanoparticles. This composite structure provides both mechanical integration with the composite material and terahertz-responsive properties for strain detection through opaque materials.
2Measurement precision
If current wound infection detection methods are used, then infection detection can be achieved, but the methods are cumbersome and time-consuming, requiring the wound to be left exposed for several seconds or even up to an hour
Solution Approach 1:
The patent replaces cumbersome mechanical detection methods with a wireless terahertz-based sensing system. The metamaterial laminate integrated into the wound dressing enables contactless, rapid infection detection through terahertz radiation interaction with the wound environment, eliminating the need for prolonged exposure or complex manual procedures.
3Measurement precision
If the wound is left exposed for infection detection, then detection can be performed, but the wound's healing environment is compromised and potential further infection can occur
Solution Approach 1:
The patent introduces a metamaterial-based sensing intermediary that enables infection detection without direct exposure of the wound. The wireless terahertz sensing system acts as an intermediary, allowing remote detection of infection markers while the wound remains covered and protected in its healing environment.
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 non-destructive strain field mapping and real-time monitoring of composite materials, preventing catastrophic failures and providing early detection of wound infections with a small, user-friendly device that maintains the wound's healing environment.
Implementation Method 1
metamaterial laminates with strain-dependent polarimetric responses
Implementation Method 2
stress-induced birefringence produces weak refractive index anisotropies
Implementation Method 3
at least one polymer nanofiber mesh having polymer nanofibers embedded with conductive nanoparticles
Data Source
AI summary
A metamaterial laminate having at least the following elements (a) at least one polymer nanofiber mesh having polymer nanofibers embedded with conductive nanoparticles, and (b) at least two films, wherein the polymer nanofiber mesh is sandwiched between the two films. Included are methods of making the laminate. A method to produce cross-direction and multilayers of multi-material nanofibrous polymer using an electrospun technique is presented. The laminate can be used in a method where it is incorporated in a structure and provides stress information by scanning with an electromagnetic radiation to determine physical change within the structure. The nanofiber polymer provides electric conductivity information detected by electrochemical analyzer.