Experiment and Analysis of Temperature Sensing of Microstructured Fiber with Silver and PDMS Films.

Shuguang Li,Hongyu Li,Tonglei Cheng,Song Zhang,Yujun Wang,Ying Guo,Xue Zhou

doi:10.3390/s22041447

Shuguang Li, Hongyu Li + Show 5 more

Open Access

https://doi.org/10.3390/s22041447

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Abstract

In this study, the silver mirror reaction was used to coat the silver film on the surface of self-made microstructured fiber (MSF) to stimulate the surface plasmon resonance effect, and Polydimethylsiloxane (PDMS) with a high thermal-optical coefficient was coated on the silver film as temperature-sensitive material. The MSF with silver and PDMS films was coupled with multi-mode fiber on both sides to form the temperature sensor. In this sensor system, the energy is coupled into the cladding of the microstructure fiber by multi-mode fiber, and the surface plasmon resonance can be further excitated in the MSF. When the temperature of the external environment changes, the refractive index of PDMS will also change. At this time, combined with the surface plasmon resonance effect, a resonant absorption peak corresponding to the temperature appears in the transmission spectrum so that the temperature can be measured quickly and accurately. We found that, in the temperature range of 35 °C to 95 °C, the average temperature sensitivity of the sensor during heating and cooling was −0.83 nm/°C and −0.84 nm/°C, respectively. The advantages of this sensor are the simple structure, convenient operation and good reversibility. The relative sensitivity deviation value (RSD = 0.0059) showed that the sensor has high stability. The temperature sensor based on MSF has favorable prospects for use in fields such as medical treatment, biochemical detection and intelligent monitoring.

Highlights

Temperature is a physical quantity used to measure the degree of heat and cold of materials
Temperature sensors based on microstructure fiber (MSF) with different measurement principles or structures have been proposed
In 2017, Yang et al investigated a fiber optic ring laser temperature sensor with a high refractive index liquid filled with MSF, and the temperature sensitivity of the wavelength modulation and intensity modulation reached −1.747 nm/◦ C

Summary

Introduction

Temperature is a physical quantity used to measure the degree of heat and cold of materials. In 2017, Yang et al investigated a fiber optic ring laser temperature sensor with a high refractive index liquid filled with MSF, and the temperature sensitivity of the wavelength modulation and intensity modulation reached −1.747 nm/◦ C and 0.137 dB/◦ C, respectively [12]. Based on the modal interference in PDMS/silica hybrid fiber structures, Gao et al proposed a high sensitivity temperature sensor duo with a large thermo-optical coefficient [20]. An optical fiber embedded in PDMS based on SPR was reported by Velazquez-Gonzalez et al.; it acts as a temperature to refractive index transducer This sensor is appealing for temperature monitoring in microfluidic devices made of PDMS due to its high-quality performance and simple fabrication process [21].

Experimental

Silver Plating

Manufacturing

Discussion

All subsequent experiments in in length this sensor from results shown

Conclusions