Abstract
Pressure sensors based on fiber-optic extrinsic Fabry-Perot interferometer (EFPI) have been extensively applied in various industrial and biomedical fields. In this paper, some key improvements of EFPI-based pressure sensors such as the controlled thermal bonding technique, diaphragm-based EFPI sensors, and white light interference technology have been reviewed. Recent progress on signal demodulation method and applications of EFPI-based pressure sensors has been introduced. Signal demodulation algorithms based on the cross correlation and mean square error (MSE) estimation have been proposed for retrieving the cavity length of EFPI. Absolute measurement with a resolution of 0.08 nm over large dynamic range has been carried out. For downhole monitoring, an EFPI and a fiber Bragg grating (FBG) cascade multiplexing fiber-optic sensor system has been developed, which can operate in temperature 300 °C with a good long-term stability and extremely low temperature cross-sensitivity. Diaphragm-based EFPI pressure sensors have been successfully used for low pressure and acoustic wave detection. Experimental results show that a sensitivity of 31 mV/Pa in the frequency range of 100 Hz to 12.7 kHz for aeroacoustic wave detection has been obtained.
Highlights
High-performance measurement on static and dynamic pressure is extremely important in many industrial areas, such as petrochemical industry, fluid engineering, wind tunnel test, biomedicine, and industrial safety
Signal demodulation algorithms based on the cross correlation and mean square error (MSE) estimation have been proposed for retrieving the cavity length of extrinsic Fabry-Perot interferometer (EFPI)
Experimental results show that a sensitivity of 31 mV/Pa in the frequency range of 100 Hz to 12.7 kHz for aeroacoustic wave detection has been obtained
Summary
High-performance measurement on static and dynamic pressure is extremely important in many industrial areas, such as petrochemical industry, fluid engineering, wind tunnel test, biomedicine, and industrial safety. Reliable pressure measurement of the underground oil reservoir can provide key data which can be used to determine the quantity of oil reserve and to optimize the production rates of reservoir recovery [1, 2] Many of these industrial processes involve harsh environment, such as high temperature, chemical corrosion, strong electromagnetic interference (EMI), and high-energy radiation exposure. These extreme physical conditions often lead to conventional pressure sensors very difficult to apply and incapable of meeting current and future measurement demands. EMI, small size, light weight, resistance to chemical corrosion, high accuracy, resolution, and capability of remote operation These advantages have promoted worldwide research activities in the field of optical fiber sensor technologies for harsh environment. Application progress of EFPI-based pressure sensor, including downhole monitoring, liquid-level monitoring, acoustic wave detection, and trace gas detection, are introduced
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