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Study On A Fiber Grating Sensor System And Temperature-Sensing Measurement

Posted on:2004-07-18Degree:MasterType:Thesis
Country:ChinaCandidate:D W TianFull Text:PDF
GTID:2168360092992229Subject:Optics
Abstract/Summary:PDF Full Text Request
In recent years, fiber Bragg gratings (FBGs) have shown an enormous potential for sensing applications in smart structures and composite materials. Owing to their intrinsic characteristics, FBGs are particularly well suited for measuring strain and temperature, which happen to be the most important physical parameters to be evaluated in a large variety of civil engineering structures and others. There are many situations in which temperature monitoring at specific locations is required in order to access structural integrity. FBGs have been widely used in these applications, because they are sensitive to temperature. In the context of fiber optical wavelength encoded sensors, FBGs have many advantages in temperature-sensing system used in composite panels and bridges.The basic theory and technology for FBG sensor have been discussed in detail in this article. We analyzed the model-coupled theory for FBG, and introduced a method to create a fiber grating. FBG's sensing-mechanism and FBG's temperature-sensing measurement are the most important parts in this article.In this article, we have proposed and demonstrated a fiber Bragg sensing structure that allows for temperature of concrete or smart structure. Two gratings have been used to implement temperature-sensing. In comparison with the bare FBQ the FBG have a better linear relationship. The results demonstrated show a satisfactory level of resolution for temperature-sensing for applications.An intrinsic problem associated with measuring temperature using FBFs is their sensitivity to strain, this being an issue that should be addressed when one is designing a temperature sensor. Research is continuing to determine the optimum materials for such sensors and to achieve an improvement in resolution of temperature-sensing. In addition, the issues of FBG stability and utility are being considered.In this article, we have also designed and made a drive circuit for LED and LD which is being used in optical communicating system or optical sensor system as broadband light-source.
Keywords/Search Tags:Fiber Bragg Grating, Fiber Grating Sensor, Temperature-sensing, Broadband Light-source
PDF Full Text Request
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