無論在軍事還是航空航天領域, 光纖傳感器都是一種極具應用前景的智能化監(jiān)測手段。目前, 將光纖傳感器用于纖維增強樹脂基復合材料固化過程的監(jiān)測的研究是一個熱點。但由于大多數(shù)光纖傳感器監(jiān)測固化過程成本較高, 所以還沒有被廣泛的應用于實際生產(chǎn)當中。開發(fā)了一種新型的低成本、高靈敏度、易操作的光纖傳感器用于纖維增強樹脂基復合材料固化過程的在線監(jiān)測。光纖傳感器的設計基于光纖微彎損耗原理, 其監(jiān)測的直接目標
參量為增強纖維所構成的網(wǎng)絡所承擔的壓力變化, 可以進而通過Gutow sk i 的樹脂流動?纖維變形理論間接得出對于固化過程中的幾個關鍵參量。給出了這種壓力傳感器的設計制作方法, 測定該種傳感器在靜態(tài)和動態(tài)下的壓力2光損耗響應曲線, 分析了該傳感器對環(huán)境溫度與折射率變化的響應。完成了利用微彎壓力傳感器進行纖維增強復合材料在熱壓釜中固化成型過程的在線監(jiān)測實驗, 獲得了良好的結果。
關鍵詞: 　光纖傳感器; 微彎; 復合材料; 固化
Abstract: 　F iber op t ic sen so r has been p roved a very p rom isingmon ito ringm ethod in m any f ields such as arm s and aero space indu st ry. O ne of it s mo st popu lar app licat ion s is the cu re p rocess mon ito ring of advanced f iber reinfo rced resin m at rix compo site. Them ain ob stacle ofw ide u t iliza2 t ion of th is techn ique is the h igh co st and comp lex modu lat ion techno logy. A novel f iber op t ic sen so r w as developed, w h ich has the featu re of h igh sen sit ivity and low co st and is easy to han2 dle, to do the job. The f iber op t ic sen so r is developed based on f iber op t ic m icrobend lo sses and aim ed to mon ito r the p ressu re variat ion, th rough w h ich key info rm at ion to the cu re can be ob2 tained th rough compu tat ion direct ly o r indirect ly, on the reinfo rced f iber netwo rk du ring the cu re p rocess. In th is p resen tat ion, the design and p reparat ion of the sen so r is given. The dynam ic and
stat ic respon se of the f iber op t ic p ressu re sen so r under p ressu re is tested. The inf luence of the temperatu re and ref ract ive index variat ion around the sen so r on the respon se of the sen so r’s sig2 nal at tenuat ion is dicu ssed. O n the basis of the f iber op t ic p ressu re sen so r, a po rtab le in st rum en t is in tegarted, w h ich includes laser diode, detecto r, A ?D , etc. W ith it in2situ mon ito ring of the cu re p rocess of f iber reinfo rced compo site lam inates is carried ou t and good resu lt is ob tained.
Key words: 　f iber op t ic sen so rs; m icrobend; compo site; cu re