Abstract
Fiber sensors have been developed for industry application with significant advantages. In this paper, Fiber sensors for oil field service and harsh environment monitoring which have been investigated in Tsinghua University are demonstrated. By discussing the requirements of practical applications, the key technologies of long-period fiber grating (LPFG) based fiber sensor, optical spectrum analyzer for oil detection, laser induced breakdown spectroscopy (LIBS) system for soil contamination monitoring, and seismic sensor arrays are described.
Highlights
With the development of opto-electronical technologies and the increasing requirements in industry and national defense, optical fiber sensors have been widely accepted and used in the past 10 years
We have focused on laser induced breakdown spectroscopy(LIBS) system, down well spectrum analyzer, fiber acoustic sensing system, and long-period fiber grating(LPFG) based sensors since 2002
When being coated with hydrogel or palladium silver (Pd-Ag) film, the cascaded LFPGs can be used as relative humidity (RH) sensors or hydrogen (H2) sensors respectively, which is useful for strategic weapon storage where the space is airtight and cramped, and conventional electrical humidity sensors cannot be used
Summary
With the development of opto-electronical technologies and the increasing requirements in industry and national defense, optical fiber sensors have been widely accepted and used in the past 10 years For those applications in harsh environment, such as oil field service, civil engineering, navigation, and monitoring in ocean, the advantages of fiber sensors are significant: immune to electromagnetic interference(EMI), small size, and easy for network integration. The microstructure fiber sensors which are fabricated in fiber to be used in small and cramped space have attracted the research groups all over the world For these reasons, we have focused on laser induced breakdown spectroscopy(LIBS) system, down well spectrum analyzer, fiber acoustic sensing system, and long-period fiber grating(LPFG) based sensors since 2002.
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