High sensitivity optical fiber temperature sensor based upon a polydimethylsiloxane filled Fabry-Perot interferometer

Abstract

A high-sensitivity temperature sensor based upon an optical fiber Fabry-Perot interferometer (FPI) filled with polydimethylsiloxane (PDMS) is reported that employed a single mode fiber (SMF) and a hollow core fiber (HCF) to enhance the sensitivity. The sensing characteristics were investigated from 20 °C to 40 °C. The experimental results demonstrate that the sensor is sensitive to temperature due to the high thermal optical coefficient (TOC) and high thermal expansion coefficient (TEC) of PDMS, achieving a high sensitivity of 2.155 nm/°C. The designed sensor shows great potential for high-precision temperature sensing applications due to its high sensitivity, compact structure, and simple preparation.

Keywords:

• Fabry-Perot interferometer (FPI)
• hollow core fiber (HCF)
• polydimethylsiloxane (PDMS)
• single mode fiber (SMF)
• temperature sensor

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Doctor Foundation of Tangshan Normal University of China (2023B06, 2023B17); the Science and Technology Plan Project of Tangshan Science and Technology Bureau Tangshan Foundation Innovation Team of Digital Media Security by Grant 21130212D; and the Research Project of Tangshan Normal University by 2023HX14.