研究目的
Investigating the ability of distributed optical fiber sensors (DOFS) to discern localized thermal heating from mechanical strain in carbon fiber/epoxy composite structures.
研究成果
The research demonstrated that an embedded DOFS network can effectively isolate and measure localized thermal responses in the presence of mechanical strain. A signal processing technique was successfully used to cancel the strain response and amplify the thermal response, suggesting its viability for rapid detection of high energy laser strikes on composite structures.
研究不足
The study was limited by the precision in aligning the sensor segments during the embedding process, which could affect the accuracy of strain cancellation. Additionally, the small spot size of the laser diode used for heating may not fully represent the conditions of a high energy laser strike.
1：Experimental Design and Method Selection:
The study involved embedding DOFS in carbon fiber/epoxy composite structures to detect temperature changes and mechanical strains. A signal processing technique was developed to isolate thermal responses from strain responses.
2：Sample Selection and Data Sources:
A 6-ply carbon fiber reinforced polymer (CFRP) specimen was prepared with embedded DOFS. The specimen was subjected to cyclic bending strain and localized heating from a low energy laser.
3：List of Experimental Equipment and Materials:
Equipment included a Luna Innovations Optical Distributed Sensor Interrogator (ODiSI-B), a 975-nm optical fiber-coupled laser diode, and a CFRP specimen with embedded DOFS.
4：Experimental Procedures and Operational Workflow:
The CFRP specimen was subjected to cyclic bending strain while being irradiated with a laser diode to simulate localized heating. The DOFS network was used to measure the response to both strain and temperature changes.
5：Data Analysis Methods:
The data was analyzed using a signal processing technique to enhance the thermal response while mitigating the strain response. The relationship between frequency shift and temperature/strain was defined using sensitivity polynomials provided by the sensor manufacturer.
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