Composite Material Packaged Fiber Grating Sensor for Structural Health Monitoring

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Solution Overview

Problem

Large-scale structural parts face damage accumulation due to adverse environmental factors, and existing health monitoring sensors are fragile, corrodible, and vulnerable to external forces, with fiber grating sensors being brittle and prone to breakage during installation and operation.

Innovation Solution

A composite material packaged fiber grating sensor with strain and temperature monitoring capabilities, featuring a fiber grating sensor component, a composite material coverage layer, and a resin package layer, designed for distributed online measurement on structural parts, providing high strength, corrosion resistance, and improved compatibility with composite materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If fiber grating sensors are used for health monitoring, then measurement accuracy and electromagnetic interference resistance are improved, but the sensors are fragile and prone to breakage during installation and operation

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidsensor fragility

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent uses composite material packaging (resin matrix with fiber reinforcement) to encapsulate the fragile fiber grating sensor, creating a protective structure that maintains the sensor's measurement accuracy while significantly improving its mechanical strength and resistance to breakage during installation and operation

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent employs a flexible composite packaging structure that conformally wraps the fiber grating sensor, providing mechanical protection while allowing the sensor to maintain its sensing functionality. The flexible nature of the composite packaging prevents stress concentration that could lead to sensor breakage

Inventive Principle:

Principle #30Flexible shells and thin films

2Strength

If metal packaging is used for fiber grating sensors, then protection and strength are improved, but density increases and corrosion resistance decreases

Engineering Contradiction:

Improveprotection strengthVSAvoidcorrosion resistance

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent replaces metal packaging with composite material packaging consisting of a resin matrix and fiber reinforcement. This composite structure provides sufficient mechanical strength and protection for the fiber grating sensor while being inherently corrosion-resistant, eliminating the corrosion issues associated with metal packaging

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the material parameters of the packaging from metal to composite materials, specifically selecting a resin matrix with appropriate mechanical properties and fiber reinforcement to achieve the required strength-to-corrosion resistance ratio, thereby improving corrosion resistance while maintaining protective strength

Inventive Principle:

Principle #35Parameter changes

3Strength

If metal packaging is used for fiber grating sensors, then strength is improved, but compatibility with composite materials deteriorates and defects form during implantation

Engineering Contradiction:

Improvepackaging strengthVSAvoidmaterial compatibility

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The patent uses composite material packaging that is homogeneous in composition and properties, matching the composite material structure of the host structure. This homogeneity ensures good interfacial compatibility, prevents galvanic corrosion, and eliminates defects during implantation that would arise from heterogeneous material interfaces

Inventive Principle:

Principle #33Homogeneity

4Reliability

If complex packaging processes are used for fiber grating sensors, then protection and reliability are improved, but manufacturing complexity and cost increase

Engineering Contradiction:

Improvesensor protectionVSAvoidpackaging process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the packaging process with the sensor fabrication process, creating an integrated composite structure where the protective packaging and the sensing element are formed simultaneously or in a unified sequence. This integration simplifies the manufacturing process, reduces the number of separate steps, and lowers overall complexity while maintaining reliable protection

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10399286B2Composite material packaged fiber grating sensor and manufacturing method thereof

Publication Date: 2019.09.03 JILIN CORE LOGISTICS & COATING EQUIP CO LTD

AI summary

A composite material packaged fiber grating sensor and a manufacturing method thereof. The sensor includes a fiber grating sensor component, a composite material coverage layer, a resin package layer and a composite material substrate layer. In the sensor, a temperature fiber grating and a strain fiber grating are packaged in a composite material structure, so that the structure is light and simple, its computability with the composite material is good, the measurement accuracy is high, and the survival rate and the service life of the installed sensor can be greatly improved, the sensor component can be externally pasted on to or inter-implanted in a composite material structural part, and can be applied to the distributed online health monitoring on the structural part. The manufacturing method of the composite material packaged fiber grating sensor is simple, efficient and stable, and is suitable for rapid mass production by enterprises.