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Research On The Key Technology Of Fiber Optic Accelerometers

Posted on:2006-06-11Degree:DoctorType:Dissertation
Country:ChinaCandidate:N CengFull Text:PDF
GTID:1118360182483699Subject:Electronic Science and Technology
Abstract/Summary:PDF Full Text Request
The thesis is supported by the national key project of 863, focused on therealization of a fiber optic sensing system suitable for oil well logging andreservoir monitoring. Compared with the traditional piezoelectric sensors,fiber optic sensors have notable advantages such as good performance, highsignal transmission capacity, ease in multiplexing and multi-parameterdetection, and immunity to electromagnetic interference etc.According to the demands of VSP equipment, the thesis studies thesensing head structure, modulation approach and system performance of fiberoptic accelerometers. The research work will be illustrated from two aspects:Based on different mechanical and optic fundamentals, the thesis reportsthree types of fiber optic accelerometers: cantilever fiber Bragg gratingaccelerometer, diaphragm type fiber optic interferometric accelerometer andbellows type fiber optic interferometric accelerometer. The design,manufacturing and analysis of the three types of fiber optic accelerometershave been described. The theoretical derivation and experimental resultsconfirm the feasibility and indicate different characteristics. The bellows typefiber optic accelerometer is the most suitable for the application in VSPequipment, and practical encapsulation and field test is in process.The thesis analyses several key characteristics of a fiber opticaccelerometer, including sensitivity, operation frequency range, crossdesensitization and detection limit. The thesis establishes a crosstalk modaland indicates the reasons and solutions of the cross response in accelerationsensing. The noise properties of a fiber optic acceleration sensing system alsohave been considered. All these comprehensive analysis is good optimumdesign basis for accomplishing a perfect fiber optic accelerometer.
Keywords/Search Tags:Fiber optic sensor, accelerometer, 3 component
PDF Full Text Request
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