Abstract
This paper outlines the motivation for structural health monitoring with fiber Bragg grating (FBG) strain sensors in nuclear power plants where a high measurement resolution is normally required. Hence, a mechanical strain amplification is needed to increase the strain sensitivities. To ensure long-term stability, an epoxy-free mechanical strain amplification sensor is constructed using a Kovar encapsulated FBG. The strain response of the sensor is characterized using an extensometer. It was found that the achieved sensitivity of 1.16 pm/με yields a strain resolution of 0.43 με with current interrogation method – which exceeds the required strain resolution for the postulated scenario. However, if a higher resolution is required, it can be achieved by using an interrogator with a higher wavelength resolution or using a strain amplification with a larger strain amplification coefficient.
| Original language | English |
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| Title of host publication | 2023 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) |
| Place of Publication | Piscataway, NJ. |
| Publisher | IEEE |
| Publication status | E-pub ahead of print - 22 May 2023 |
| Event | IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2023) - Kuala Lumpur Convention Centre, Kuala Lumpur, Malaysia Duration: 22 May 2023 → 25 May 2023 https://i2mtc2023.ieee-ims.org/ |
Conference
| Conference | IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2023) |
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| Country/Territory | Malaysia |
| City | Kuala Lumpur |
| Period | 22/05/23 → 25/05/23 |
| Internet address |
Keywords
- optical strain sensing
- fibre Bragg grating sensors
- nuclear power plant
- mechanical strain amplification
- metal encapsulation of fibre Bragg gratings