Subsurface Diffraction Cavities for Structural Strain Detection

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Solution Overview

Problem

Existing non-destructive inspection techniques fail to effectively indicate cumulative effects of environmental conditions on structural components, such as repetitive loading, impacts, and thermal stresses, which can compromise mechanical properties without visible indications.

Innovation Solution

Structural components are engineered with geometric patterns of diffraction cavities that diffract non-visible electromagnetic energy, allowing for the detection of strain through changes in wavelength, using EM energy sources and detectors to assess strain caused by environmental conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional non-destructive inspection techniques are used, then the structural component can be inspected without damage, but they fail to detect cumulative strain effects from environmental conditions

Engineering Contradiction:

Improvedetection capabilityVSAvoidstrain information

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent embeds diffraction cavities into the structural component during manufacturing, creating a built-in strain sensing system before the component is exposed to environmental conditions. This preliminary action ensures that the component has inherent capability to record cumulative strain effects from future environmental exposure, which conventional inspection methods cannot detect.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces electromagnetic radiation as an intermediary to interact with the diffraction cavities. By projecting EM radiation through the component and analyzing the diffracted pattern, the system indirectly measures strain effects without physically contacting or damaging the component, thereby recovering strain information that conventional methods miss.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If geometric patterns of diffraction cavities are embedded in the structural component, then strain detection capability is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improvestrain detectionVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The diffraction cavity pattern serves multiple functions: it acts as a structural element of the component, a strain sensing mechanism, and a diffraction grating for EM radiation. This multi-functionality reduces the need for separate sensing components, thereby managing manufacturing complexity while maintaining reliable strain detection capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent varies the spacing and geometry of the diffraction cavities to optimize strain detection sensitivity for different environmental conditions. By adjusting these parameters during design, the system achieves high detection reliability without requiring overly complex manufacturing processes, as the changes are incorporated into the standard manufacturing parameters.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If the cavity spacing distance is matched to the wavelength of EM energy, then diffraction efficiency is improved, but the system becomes more sensitive to wavelength variations

Engineering Contradiction:

Improvestrain measurementVSAvoidwavelength sensitivity

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The system uses the diffracted EM radiation pattern as feedback to determine strain magnitude. By measuring changes in the diffraction pattern caused by strain-induced cavity spacing changes, the system accurately quantifies strain while accounting for wavelength variations through the relationship between diffraction angle, wavelength, and cavity spacing.

Inventive Principle:

Principle #23Feedback

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

The method provides timely detection of strain in structural components, enabling scheduled maintenance and replacement by correlating diffracted EM energy wavelengths with strain, ensuring structural integrity.

Implementation Method 1

geometric patterns of diffraction cavities within the structural components that diffract nonvisible electromagnetic (EM) energy to produce detectable variations in the wavelength of EM energy reflected or transmitted from the structural component

Methodology Applied

Scientific EffectDiffraction: Diffraction

Data Source

PatentEP3859270B1Sub-surface patterning for diffraction-based strain measurement and damage detection in structures

Publication Date: 2026.02.04 THE BOEING CO

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AI summary

Systems and methods for assessing strain in structural components are disclosed. Structural components may have geometric patterns of diffraction cavities within the structural component, with the diffraction cavities in the geometric pattern each having a cavity width and being spaced from each other by a cavity spacing distance. The method may include projecting beams of electromagnetic (EM) energy through the structural component to the geometric pattern of diffraction cavities to create diffracted beams of EM energy that are reflected from or transmitted through the geometric pattern of diffraction cavities and have diffracted wavelengths indicating changes in the cavity spacing distances due to strain caused when the structural component is exposed to environmental conditions, detecting the diffracted wavelength of the diffracted beams, and correlating the diffracted wavelengths of the diffracted beams to the strain in the structural components.