光纤Bragg光栅振动传感技术研究-测试计量技术及仪器专业论文.docxVIP

AbstTaCtTitle：STUDY AbstTaCt Title：STUDY OF VIBRATION SENSING TECHNOLOGY BASED ON FIBER BRAGG GRATING Major：Measurement Technologies and Instrumentations Name：Qingna U Signature：上i垒沁必 Supervisor：Prof．Mingxing JIAO Signature：2Zz-2边 Abstract More and more vibration sensing end measu血g problems should be solved urgently in the fields of aviation,spaceflight,petroleum,ocean,bridge，etc．，SO as to assure the safety of the large engineering structures．Nevertheless the currently used electromagnetic accelerometer is difficult to meet the measu血g requirements．Fiber Bragg grating(FBG)sensor is one of the fiber-optic SeUSOr3 which，has been developed rapidly in rec．∞t years．It has many advantages such as anti·interference in electromagnetism,high-sensitivity,light weight and compaction in construction,SO the investigation of a FBG vibration sensing technology with first priority to acceleration is of great significance． A method of FBG vibration sensing end measuring technology based on equal—intensity beam was proposed,and the scheme Was analyzed theoretically end investigated experimentally in this thesis．The main contents are included as follows： Firstly,the characteristics of the common vibration sensor end fiber-optic sensor,end the research end development status of FBG vibration sensors were briefly introduced． Secondly,the FBG fabricating method,sensing principle end common wavelength demodulation technique were summarized．And the advantages end disadvantages of an kinds of demodulation techniques were analyzed in detail． Thirdly,two FBG vibration sensing schemes based Oll the convexity crOSS·section beam end equal·intensity beam were designed,and the strain sensing principles using the two different beams Were analyzed,respectively．The optimized results and the mode analysis of convexity a【c姆sed瞳∞beam were carried out using the software of ANSYS．By analyzing end comparing the advantages end disadvantages of the two methods，the equal-intensity beam was finally chos