Hydrostatic pressure sensor based on a gold-coated thin-core fiber modal interferometer and ripple shift measurement

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• 作者：Daru Chen^a ; ^daru@zjnu.cn ; Xin Cheng^b ; H.Y. Tam^b
• 关键词：Hydrostatic pressure sensor ; Thin-core fiber ; Fiber modal interferometer ; Gold coating
• 刊名：Optics Communications
• 出版年：2012
• 期刊代码：50_00304018
• 类别：ph
• 出版时间：15 July, 2012
• 卷：285
• 期：16
• 页码：3471-3474
• 文件大小：635 K

摘要

We propose a hydrostatic pressure sensor based on a gold-coated thin-core fiber modal interferometer (TCFMI). A thin-core fiber is spliced to a single mode fiber forming a single-end fiber modal interferometer (FMI) due to the core mismatch and the fiber end reflection. Relative reflection spectra of TCFMIs based on thin-core fibers with different lengths are investigated. The TCFMI is gold-coated to enhance the optical reflectivity, which also results in the ripple of the relative reflection spectra of TCFMI. A high hydrostatic pressure sensor test system is proposed and the performance of the pressure sensor has been experimentally investigated. A pure-ripple-shift measurement method is used to achieve the demodulation of the sensor. The proposed pressure sensor has a sensing range up to 40 MPa and a sensitivity of 44.8 pm/MPa.