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The research on long-term stability of optical fiber sensor has drawn more and more attention in recent years, especially due to corrosion and hydrogen loss in harsh environment, while carbon plating on the surface of optical fiber sensor is proven to be an effective way to enhance the performance of optic-fiber sensor. Chemical vapor deposition (CVD) were introduced and a device for depositing carbon...
A label-free immunosensor based on optical fiber Fabry–Perot interferometer (FPI) is proposed. The FPI is fabricated by splicing both ends of a short section of hollow-core photonic crystal fiber to single mode fibers (SMFs) and cleaving the SMF pigtail to proper length. Then, the end surface of sensor is silanization modified and immobilized with goat anti-rabbit immunoglobulin G (IgG) by covalent...
A Pressure and temperature (P&T) monitoring system based on fiber Bragg grating (FBG) and extrinsic Fabry-Perot interferometer (EFPI) for downhole application is designed and tested. The system is electronically passive, with no electronics downhole, and can monitor downhole pressure and temperature continuously without breaking in production of oil well. It is demonstrated in experimental well...
A method to interrogate fibre Bragg grating vibration sensor by narrow line width light is demonstrated; the interrogation scheme takes advantage of the intensity modulation of narrow spectral bandwidth light, such as distributed feedback laser, when a reflection or transmission spectrum curve of an FBG moves due to the strain which applied on the sensor. The sensor's response to acceleration frequency...
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