Abstract
An all-silica Fabry-Pérot interferometer (FPI) is demonstrated for high-temperature pressure monitoring. The pressure sensor is fabricated with single mode fiber and silica capillary by CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> laser. Owing to slight mismatch of thermal expansion coefficient in all-silica structure, it can work stably under 600°C atmosphere. The influence of the temperature on the pressure sensor was investigated within a temperature range from 25°C to 700°C and a pressure range from standard atmosphere pressure to 4 MPa. The experimental results show that the wavelength shift versus the pressure at each temperature is linear, which indicates the proposed FPI pressure sensor has potential applications in industrial reactors, oil and gas wells, and so on.
Highlights
Fiber-optic pressure sensor has found many applications in the fields of aircraft, oil field, nuclear power, etc
The fiber-optic pressure sensors based on Fabry-Pérot interferometers (FPIs) have attracted much interest of the researchers because of the stable performance for pressure monitoring, high pressure sensitivity and so on
FPI pressure sensors can be divided into two types, including intrinsic Fabry-Pérot interferometers (IFPIs) [8][9] and extrinsic Fabry-Pérot interferometers (EFPIs) [10][11]
Summary
Fiber-optic pressure sensor has found many applications in the fields of aircraft, oil field, nuclear power, etc. The fabricated UV adhesive based pressure sensors have been demonstrated with the sensitivity of 475 pm/MPa [8] and 1.13 nm/MPa around 1560 nm [9] They could be only used in the room temperature environment limited by the UV adhesive’s tolerable temperature. An all-silica EFPI pressure sensor was fabricated by CO2 laser fusion without any other adhesive, which can work stably at 600°C to measure the surrounding pressure with a pressure sensitivity of 1.46 nm/MPa. Pressure tests were carried out from 25°C to 700°C with a range from standard atmosphere pressure to 4 MPa. The experimental results show that the relative wavelength shift is linearly proportional to the pressure with the temperature-dependent sensitivity, which decreases from 1.62 nm/MPa at 25°C to 1.39 nm/MPa at 700°C. It offers potentials for pressure sensing, like gas or fluid pressure monitoring int the fields with high-temperature scenario
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