Evaluation of in-situ optical loss of polyimide-coated optical fiber under hydrothermal environments

被引：2

作者：

Matsuda, Tetsushi ^{[1
]}

Kitaoka, Satoshi ^{[1
]}

Nakahira, Kenji ^{[1
]}

Ito, Taishi ^{[1
]}

Kato, Takeharu ^{[1
]}

Kasahara, Junzo ^{[2
,3
]}

机构：

[1] Japan Fine Ceram Ctr, 2-4-1 Mutsuno,Atsuta Ku, Nagoya 4568587, Japan

[2] Engn Advancement Assoc Japan, 1-11-9 Azabudai,Minato Ku, Tokyo 1060041, Japan

[3] Shizuoka Univ, Ctr Integrated Res & Educ Nat Hazard, 836 Ohya, Shizuoka, Japan

来源：

OPTICAL FIBER TECHNOLOGY | 2024年 / 82卷

关键词：

Optical fiber; Optical fiber sensing; Darkening; Hydrothermal; Hydrogen absorption; TRANSMISSION LOSS; HYDROGEN; TRANSPORT; STEEL; GLASS;

D O I：

10.1016/j.yofte.2023.103582

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

When distributed fiber optic sensing (DFOS) devices are deployed in a geothermal borehole, the optical fiber as the key element, must be able to withstand the harsh environment because the temperature of the geothermal boreholes is higher than 250 degrees C in most cases. Understanding the deterioration behavior of optical fibers in hydrothermal conditions higher than 250 degrees C is important for predicting the lifetimes of DFOSs in operation.Geophysical equipment using optical fiber sensing was developed for in-situ measurement of the optical loss of optical fibers under hydrothermal conditions, and a survey method was established. Using this optical fiber sensing, we characterized the deterioration behavior of single-mode polyimide-coated optical fibers. Our experiments with carbon / polyimide-coated fibers under subcritical water from 250 to 350 degrees C revealed that the polyimide layer and silica cladding easily dissolved in water in that environment.

引用

页数：6

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