本文選題：FBG + 檢測系統(tǒng)　； 參考：《安徽工業(yè)大學(xué)》2017年碩士論文

【摘要】：光纖光柵作為傳感器由于體積小、質(zhì)量輕、外形可變,適合埋入大型結(jié)構(gòu)中,可以測量結(jié)構(gòu)內(nèi)部的應(yīng)力、應(yīng)變、結(jié)構(gòu)損傷等,且具有穩(wěn)定性好、抗腐蝕、抗電磁干擾的特點(diǎn),適合在惡劣環(huán)境中工作;可以在一根光纖中寫入多個光柵,實現(xiàn)分布式傳感;測量信息是波長編碼,不受光源的光強(qiáng)波動的影響,具有較強(qiáng)的抗干擾能力。由于具有以上這些優(yōu)點(diǎn),光纖光柵傳感器在大型土木工程結(jié)構(gòu)、能源化工、航空航天、生物醫(yī)學(xué)等領(lǐng)域得到了廣泛的應(yīng)用。論文首先介紹了光纖光柵的發(fā)展歷史,以及光纖光柵作為傳感器的優(yōu)缺點(diǎn),并對FBG的結(jié)構(gòu)進(jìn)行了介紹說明。對常用的光纖光柵解調(diào)方法進(jìn)行了介紹,給出了每種解調(diào)方法的特點(diǎn)、并闡述了光纖光柵在傳感領(lǐng)域的應(yīng)用。其次,對硬件平臺各個器件模塊進(jìn)行選型,并對相應(yīng)的模塊的參數(shù)性能進(jìn)行了介紹;考慮到實際工程應(yīng)用當(dāng)中可能會出現(xiàn)的問題,搭建出了基于FBGA解調(diào)的光纖光柵檢測系統(tǒng)硬件平臺。再次,通過調(diào)用模塊的底層動態(tài)鏈接庫,編寫了相應(yīng)的溫度檢測系統(tǒng)軟件程序,包括初始化程序、連續(xù)采集程序等,并對溫度檢測系統(tǒng)進(jìn)行試驗驗證,實驗結(jié)果與高精度恒溫箱的測量結(jié)果進(jìn)行比較,驗證了系統(tǒng)的可行性。結(jié)果表明溫度檢測系統(tǒng)的溫差范圍小于0.5℃,當(dāng)置信概率為95.40%時,重復(fù)性指標(biāo)Re為?0.0210%。此外,對光纖光柵沖擊檢測系統(tǒng)進(jìn)行了軟件設(shè)計,包括高速沖擊數(shù)據(jù)連續(xù)采集程序、高速數(shù)據(jù)存儲程序等,并對設(shè)計的沖擊檢測系統(tǒng)進(jìn)行實驗,選擇較理想的硅膠基封裝體作為傳感元件,采用傅里葉變換獲取數(shù)據(jù)的頻譜信息,實驗結(jié)果表明本文設(shè)計的沖擊檢測系統(tǒng)是可行的,其中沖擊檢測系統(tǒng)峰值波長誤差小于0.05nm,響應(yīng)時間小于0.1s。本文在對FBGA解調(diào)模塊認(rèn)識和分析的基礎(chǔ)上,采用調(diào)用其底層動態(tài)鏈接庫的方法來編寫相應(yīng)的測試軟件,并通過仿真和實驗研究對檢測系統(tǒng)的可行性進(jìn)行了驗證,為開發(fā)出經(jīng)濟(jì)實用的FBG檢測系統(tǒng)奠定初步基礎(chǔ)。
[Abstract]:Because of its small size, light weight and variable shape, fiber Bragg grating can be used to measure stress, strain and structural damage in large structures, and it has the characteristics of good stability, corrosion resistance and electromagnetic interference resistance.It is suitable for working in harsh environment; it can write multiple gratings in one fiber to realize distributed sensing; the measurement information is wavelength coding, independent of the fluctuation of light intensity of light source, so it has strong anti-interference ability.Because of these advantages, fiber Bragg grating sensors have been widely used in large civil engineering structures, energy and chemical industry, aerospace, biomedicine and other fields.Firstly, the paper introduces the history of fiber grating and the advantages and disadvantages of fiber grating as sensor, and introduces the structure of FBG.The common demodulation methods of fiber grating are introduced, the characteristics of each demodulation method are given, and the application of fiber Bragg grating in sensing field is described.Secondly, each device module of the hardware platform is selected, and the parameter performance of the corresponding module is introduced.The hardware platform of fiber grating detection system based on FBGA demodulation is built.Thirdly, by calling the bottom dynamic link library of the module, the corresponding software program of temperature detection system is written, including initialization program, continuous acquisition program, etc., and the temperature detection system is tested and verified.The feasibility of the system is verified by comparing the experimental results with the measurement results of high precision thermostat.The results show that the temperature difference range of the temperature detection system is less than 0.5 鈩，

本文編號：1745653