Abstract
In this study, in-situ electroplating method was used to fabricate a metal joint fixed extrinsic Fabry-Perot interferometric (EFPI) sensor. Specifically, optical fibers were firstly chemical plated with a very thin conductive nickel layer and then electroplated with nickel coating. After that, in-situ electroplating method was used to fix the metallized optical fibers and the capillary steel tube, the reflection spectra changes of the EFPI sensors during the in-situ electroplating process were recorded in real time, and the temperature sensing characteristics of the EFPI sensors were studied assisted by the temperature sensing system. Results show that: (i) optical fibers are well protected by the nickel layer; (ii) the reflection spectra of the EFPI sensors are clear and complete in the whole in-situ electroplating process, it is feasible to fabricate a EFPI sensor with the in-situ electroplating method; (iii) with the increases of temperature, the peak numbers of the reflection spectra of the EFPI sensors increase gradually; (iv) the EFPI sensors with different cavity length based on the in-situ electroplating method show excellent sensing characteristics, the temperature sensitivities reach up to about 700, 600, and 400 pm/°C from room temperature to 400 °C, respectively.
Highlights
Optical fiber sensor as a new type of sensor has been developed rapidly in recent years
The results are presented in those stages: spectral characteristics of extrinsic Fabry-Perot interferometric (EFPI) sensors during the in-situ
The reflection spectrum of the EFPI sensor is formed by the interference between the reflected lights at the incident and reflective interfaces of the EFPI sensor
Summary
Optical fiber sensor as a new type of sensor has been developed rapidly in recent years. Among the above three types of optical fiber F-P sensors, the EFPI sensor has the advantages of easy fabrication, small size, low cost production, wide wavelength adjustment range, high precision and so on It has been received extensive attentions [25,26]. Three kinds of methods have been used to fix the optical fibers and the capillary tubes in the fabrication process of the EFPI sensor: arc welding; organic glue bonding; laser hot-melting. Changed the position of the optical fibers to form an F-P cavity, when the EFPI sensor generated stable reflection spectrum, the optical fibers and capillary steel tube were fixed by the in-situ electroplating method. The reflection spectral changes during the electroplating process and its temperature sensing characteristics were studied
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