Optical Fiber Sensor Debonding Detection on Adherend
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Solution Overview
Problem
Existing debonding detection methods using optical fiber sensors require multiple sensors on both members, leading to increased weight and complexity, and require data adjustment for accurate debonding detection.
Innovation Solution
An optical fiber sensor is placed on the adherend adjacent to the adhering object, measuring strain data which is compared to reference data to determine debonding presence and position, allowing for simplified configuration and reduced weight by eliminating the need for sensors on the adhering object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical fiber sensors are provided on both members (adherend and adhering object), then debonding detection accuracy is improved, but device complexity and weight increase
Solution Approach 1:
The invention extracts the optical fiber sensor from the adhering object and places it only on the adherend. This eliminates the need for sensors on both members while maintaining debonding detection capability, thereby reducing device complexity and weight without sacrificing measurement precision
Solution Approach 2:
The single optical fiber sensor on the adherend serves multiple functions: it detects both the strain of the adherend and the debonding state at the adhering portion. This multi-functionality allows accurate debonding detection without requiring separate sensors on both members
2Reliability
If optical fiber sensors are provided on both members, then debonding detection is enabled, but weight increases
Solution Approach 1:
The sensor system is extracted from the dual-sensor configuration and reduced to a single sensor on the adherend. This removal of redundant sensors directly reduces the weight of the stationary sensor system while preserving debonding detection capability
Solution Approach 2:
The invention uses strain data from the adherend as a proxy to infer the debonding state at the adhering portion. This indirect measurement approach eliminates the need for physical sensors on the adhering object, reducing weight while maintaining detection reliability
3Measurement precision
If strain data from two optical fiber sensors are used for debonding detection, then detection is possible, but data adjustment and normalization are required
Solution Approach 1:
The invention extracts the debonding detection function from the dual-sensor data comparison approach and implements it through single-sensor strain analysis. This eliminates the need for data matching and normalization between two sensors, simplifying data processing while maintaining detection accuracy
Solution Approach 2:
The single optical fiber sensor on the adherend independently provides all necessary strain data for debonding detection. The system uses the adherend's strain characteristics to self-determine the debonding state without requiring external data from another sensor, thereby eliminating data adjustment requirements
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
This approach enables accurate detection of debonding with reduced weight and complexity, as the optical fiber sensor only needs to be on the adherend, and eliminates the need for data normalization or adjustment, improving detection accuracy and simplifying the configuration.
Implementation Method 1
an optical fiber sensor is provided on the adherend... the optical fiber sensor measures a strain of the adherend
Data Source
AI summary
A debonding detecting method detects debonding of an adhering portion at which an adhering object adheres to an adherend. An optical fiber sensor is provided on the adherend adjacent to the adhering object. A longitudinal direction of the optical fiber sensor is along a direction in which the adhering object extends. Reference strain data of a strain measured by the optical fiber sensor is prepared in advance when a load is applied to the adherend in a reference state in which debonding of the adhering portion does not occur. The debonding detecting method includes: applying a load to the adherend; measuring a strain of the adherend by the optical fiber sensor; and the determining presence or absence of debonding based on comparison result obtained by comparing measured strain data measured in the measuring and the reference strain data.