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Simultaneous Strain and Temperature Sensor Based on a Fiber Mach-Zehnder Interferometer Coated with Pt by Iron Sputtering Technology

State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, 932 South Lushan Street, Changsha 410083, China
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Materials 2018, 11(9), 1535; https://doi.org/10.3390/ma11091535
Received: 13 July 2018 / Revised: 13 August 2018 / Accepted: 23 August 2018 / Published: 26 August 2018
We demonstrated a fiber in-line Mach-Zehnder interferometer (MZI) coated with platinum (Pt) for the simultaneous measurement of strain and temperature. The sensor was fabricated by splicing a section of multimode fiber (MMF) between two single mode fibers (SMFs) and the Pt coating was prepared by iron sputtering technology. Fine interference fringes of over 20 dB with a compact size of 20 mm were achieved. The experimental results of the two different resonant dips showed strain sensitivities of −2.06 pm/με and −2.21 pm/με, as well as temperature sensitivities of 55.2 pm/°C and 53.4 pm/°C, respectively. Furthermore, it was found that the Pt coating can improve the strain sensitivity significantly, resulting in an increase of about 54.5%. In addition, the sensor has advantages of easy fabrication, low cost, and high sensitivity, showing great potential for the dual-parameter sensing of strain and temperature. View Full-Text
Keywords: Mach-Zehnder interferometer (MZI); multimode fiber (MMF); Pt coating; dual-parameter sensing Mach-Zehnder interferometer (MZI); multimode fiber (MMF); Pt coating; dual-parameter sensing
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Dong, X.; Du, H.; Sun, X.; Duan, J. Simultaneous Strain and Temperature Sensor Based on a Fiber Mach-Zehnder Interferometer Coated with Pt by Iron Sputtering Technology. Materials 2018, 11, 1535.

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