Abstract

An optical fiber sensor based on the Hybrid Fabry–Perot for simultaneous measurement of milli-Newton axial force and temperature is proposed. This structure is composed of a single-mode optical fiber (SMF) integrated to a silica capillary tube (SCT) with polydimethylsiloxane (PDMS). A microsilica sphere cavity (MSSC) is fabricated at the tip of a capillary tube. Consequently, an air gap followed by a microsilica sphere forms two cascade cavities. To explain the transferring load from the SMF to the SCT through PDMS, a shearing mechanism is employed. The experimental results show that axial force and temperature sensitivities of the air gap cavity in the range of 0–3.43 mN and 30–65°C are 170 pm/mN and 24 pm/°C, respectively, while the MSSC did not show any force sensitivity due to its rigidity. However, its temperature sensitivity is 34 pm/°C. The different sensitivities enable us to implement simultaneous sensing of force and temperature.

© 2018 Optical Society of America

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