Simultaneous Measurement of Pressure and Temperature Based on Graphene

Abstract

This paper presents an ultrahigh sensitive pressure and temperature sensor based on a Fabry-Perot interferometer (FPI) using a graphene diaphragm. The cavity of the FPI is the gap between the end-face of fiber Bragg gratings (FBG) and the graphene diaphragm. To prevent the serious cross-impact of pressure and temperature, a FBG is used to replace the single mode fiber. The sensitivities of pressure are 17.4698nm/kPa and 0.0267pm/kPa for FPI and FBG, respectively. The sensitivities of temperature are 5.075nm/°C and 10.9pm/°C, for FPI and FBG, respectively. The resolutions for pressure and temperature measurement are ±0.0267kPa and ±0.459°C with the wavelength resolution of 5pm. The experimental results show that the sensor is able to measure pressure and temperature simultaneously and accurately by a matrix on sensitivity. The proposed sensor can be applied on wide applications such as ocean exploration, biomedical science, and microfluidic, etc.