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Embedded Infrared Fiber-optic Sensor for Thermometry in a High Temperature/Pressure Environment
유욱재,장경원,문진수,한기택,전다영,이봉수,박병기 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.9
In this study, we developed an embedded infrared fiber-optic temperature sensor using two identical silver halide optical fibers for thermometry in high temperature/pressure and water-chemistry environments. The performance of the fabricated temperature sensor was assessed in an autoclave that was filled with an aqueous coolant solution containing boric acid and lithium hydroxide. We carried out real-time monitoring of the infrared radiation emitted from the signal and reference probes according to temperature variation over a temperature range from 95 to 225 ℃. In order to decide the temperature of the synthetic coolant solution, the difference between the infrared radiation emitted from the two temperature sensing probes was measured. Thermometry with the proposed sensor is immune to any changes of physical conditions and emissivity of a heat source. From the experimental results, the embedded infrared fiber-optic temperature sensor can withstand and normally operate in a high temperature/pressure test loop system corresponding with the coolant system used for nuclear power plant simulation. It is expected that the proposed sensor can be developed to accurately monitor temperature in harsh environments.
Applications of fiber optic sensors for structural health monitoring
Kesavan, K.,Ravisankar, K.,Parivallal, S.,Sreeshylam, P. Techno-Press 2005 Smart Structures and Systems, An International Jou Vol.1 No.4
Large and complex structures are being built now-a-days and, they are required to be functional even under extreme loading and environmental conditions. In order to meet the safety and maintenance demands, there is a need to build sensors integrated structural system, which can sense and provide necessary information about the structural response to complex loading and environment. Sophisticated tools have been developed for the design and construction of civil engineering structures. However, very little has been accomplished in the area of monitoring and rehabilitation. The employment of appropriate sensor is therefore crucial, and efforts must be directed towards non-destructive testing techniques that remain functional throughout the life of the structure. Fiber optic sensors are emerging as a superior non-destructive tool for evaluating the health of civil engineering structures. Flexibility, small in size and corrosion resistance of optical fibers allow them to be directly embedded in concrete structures. The inherent advantages of fiber optic sensors over conventional sensors include high resolution, ability to work in difficult environment, immunity from electromagnetic interference, large band width of signal, low noise and high sensitivity. This paper brings out the potential and current status of technology of fiber optic sensors for civil engineering applications. The importance of employing fiber optic sensors for health monitoring of civil engineering structures has been highlighted. Details of laboratory studies carried out on fiber optic strain sensors to assess their suitability for civil engineering applications are also covered.
박준석,김병철,정규산,서동우,박기태 한국복합신소재구조학회 2018 복합신소재구조학회 학술발표회 Vol.2018 No.04
The purpose of this study is to develop a carbon fiber sheet with embedded fiber optic sensor for maintenance and performance improvement of aged concrete bridges. The carbon fiber sheet bonded method has many advantages in terms of member repair and reinforcement, but it is disadvantageous in that it is necessary to directly identify the separate point generated during the bonded of the carbon fiber sheets by an artificial method. In this study, we examined the method of confirming the separate point of the carbon fiber sheets by examining the strain of the fiber optic sensor embedded in the carbon fiber sheets. The strain rate measured by the fiber optic sensor was replaced by the strain of the carbon fiber sheets derived from the FEM analysis.