Investigation of Composite Structure with Dual Fabry–Perot Cavities for Temperature and Pressure Sensing

Jun Wang,Mengxing Huang,Guanjun Wang,Ming Song,Diyang Wu,Long Li,Shuaicheng Liu,Wei Wang

doi:10.3390/photonics8050138

Abstract

To deeply analyze the influence of diaphragm materials on the temperature and pressure sensitivity of Fabry–Perot interferometer-based dual-parameter fiber sensors, the multiple transfer method was used to fabricate the dual Fabry–Perot cavities, respectively, consisting of the following combinations: epoxy resin AB/polydimethylsiloxane (PDMS), Ecoflex0030 silicone rubber /PDMS, and PDMS/Ecoflex0030 silicone rubber. Experimental results show that the temperature sensitivities are, respectively, 528, 540, and 1033 pm/°C in the range of 40–100 °C. Within the applied pressure range of 100–400 kPa, the pressure sensitivities are, respectively, 16.0, 34.6, and 30.2 pm/kPa. The proposed sensors have advantages of proper sensitivity, simple fabrication, cost-effectiveness, controllable cavity length, and suitability for practical sensing applications.

Highlights

Optical fiber sensors have been widely used in many domains owing to the advantages of low cost, high sensitivity, fast response time, and good stability
Due to the advantages of small size, good measurement performance, and survivability in complicated electromagnetic environment [7,8,9,10,11,12,13,14,15,16,17,18,19], Fabry–Perot Interferometer (FPI)-based dual-parameter fiber sensors have been extensively studied for the measurement of temperature and pressure
It will result in a great challenge for the design of the interrogator’s bandwidth. Another dual FPI-based fiber sensor consisting of two tiny segments of hollow-core fiber located at the end of lead-in single mode fiber, the design of the interrogator’s bandwidth

Summary

Introduction

Optical fiber sensors have been widely used in many domains owing to the advantages of low cost, high sensitivity, fast response time, and good stability. Different sensor structures with diverse sensitivities to various parameters can be used to realize dual- or even multi-parameter sensing, such as temperature, pressure, refractive index, etc. Due to the advantages of small size, good measurement performance, and survivability in complicated electromagnetic environment [7,8,9,10,11,12,13,14,15,16,17,18,19], Fabry–Perot Interferometer (FPI)-based dual-parameter fiber sensors have been extensively studied for the measurement of temperature and pressure.

Results

Conclusion