Automated Fiber Composite Inspection Using Optical Reflectivity

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Solution Overview

Problem

Manual inspection of fiber laminates in automated fiber laying systems is inefficient and prone to errors, significantly reducing production efficiency and increasing system downtime due to the need for human intervention and qualitative assessment of fiber layer deposition.

Innovation Solution

A method using electromagnetic radiation sensors to determine the bidirectional reflectance distribution function (BRDF) and bidirectional scattering distribution function (BSDF) of the fiber material with applied auxiliary materials, allowing for automated quality assurance of the auxiliary material's dosage and homogeneity during the deposition process, enabling quick and reliable detection of application properties without contact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If manual inspection is used to detect defects in fiber laminates, then measurement precision can be achieved, but productivity decreases significantly due to system downtime and labor requirements

Engineering Contradiction:
Improvedefect detection accuracyVSAvoidproduction efficiency
Core Design Contradiction:
Measurement precisionVSProductivity

Solution Approach 1:

The patent replaces manual mechanical inspection with an automated optical measurement system using light projection and camera-based height profile detection. This substitution eliminates the need for human operators to physically examine each fiber layer, thereby maintaining measurement precision while dramatically improving productivity by enabling continuous automated inspection during the fiber laying process.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent creates a digital copy (height profile) of the fiber laminate surface through optical scanning and light projection. This digital representation allows for automated defect detection and analysis without requiring physical handling or stopping the production line, thus preserving measurement accuracy while enhancing production efficiency through non-contact, rapid data acquisition.

Inventive Principle:
Principle #26Copying

2Productivity

If automated fiber placement systems are used to deposit fiber material, then productivity increases, but manufacturing precision may deteriorate due to the complexity of automated processes

Engineering Contradiction:
Improvedeposition speedVSAvoidfiber layer quality
Core Design Contradiction:
ProductivityVSManufacturing precision

Solution Approach 1:

The patent implements a real-time feedback system where the optical measurement device continuously scans the fiber laminate during deposition and provides height profile data. This feedback enables immediate detection of deviations in fiber placement quality, allowing the automated system to maintain manufacturing precision by identifying and correcting issues while the process is ongoing, rather than relying solely on post-processing inspection.

Inventive Principle:
Principle #23Feedback

Solution Approach 2:

The patent performs preliminary detection of potential defects during the fiber laying process itself, before the component is fully assembled and cured. By detecting height variations and anomalies in real-time during deposition, the system can identify quality issues early, allowing for corrective actions to be taken while the fiber laminate is still accessible and modifiable, thereby maintaining manufacturing precision at high productivity levels.

Inventive Principle:
Principle #10Preliminary action

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 rapid and reliable automated quality assurance of the auxiliary material's application, ensuring accurate dosage and homogeneity, thereby improving production efficiency and reducing errors in fiber composite component manufacturing.

Implementation Method 1

the fiber material applied with the auxiliary material is recorded by at least one electromagnetic radiation sensor of a recording sensor system, and at least one electromagnetic retroreflective property is determined based on the electromagnetic radiation recorded by the recording sensor system

Methodology Applied
Scientific EffectElectromagnetic radiation reflection: Reflection

Data Source

PatentEP3862746B1Method and device for determining an application characteristic
Publication Date: 2024.02.28 DEUTSCHES ZENTRUM FÜR LUFT UND RAUMFAHRT E V
  • EP3862746B1 patent drawingFigure 1
  • EP3862746B1 patent drawingFigure 2
  • EP3862746B1 patent drawingFigure 3

AI summary

The invention relates to a method for determining at least one application property of an auxiliary material applied to a fiber material of a fiber composite material, wherein the fiber composite material comprises the fiber material and a matrix material embedding the fiber material for the production of a fiber composite component, wherein the method comprises the following steps: - recording the fiber material applied with the auxiliary material by means of at least one electromagnetic radiation sensor of a recording sensor system and determining at least one electromagnetic reflectivity property of the fiber material applied with the auxiliary material based on the electromagnetic radiation recorded by the recording sensor system; and - determining the at least one application property of the auxiliary material applied to the fiber material as a function of the at least one determined electromagnetic reflectivity property by means of an evaluation unit.