基于长周期光栅边缘滤波解调的光纤布喇格光栅位移传感研究.pdf

第 22 卷 　第 9 期 传 感 技 术 学 报 Vol . 22 　N o . 9 2009 年 9 月 CHIN ES E J OU RNAL OF S EN SORS AND AC TUA TORS Sep . 2009 Edge Filter Demodulation of Fiber Bragg Grating Displacement Sensing Using Long Period Grating H UA N G Yong l i n , D A I S en Col leg e of Op toelect ronic Eng i neeri ng ; N anj i ng Uni vers ity of Pos ts an d Telecom m unicat ions , N anj i ng 2 10003 , Chi na Abstract :A n edge filt er demo dulation of fiber Bragg grating ( FB G) di sp lacement mea surin g scheme u sing long p erio d grating (L P G) i s report ed and demon st rat ed . The sy st em con si st s of a 3dB coup ler ,a sen sing FB G ,a L P G an d a p hotodet ector . The exp eriment al re sult s show t hat t he outp ut power det ect ed by t he p hotodet ector an d t he di sp lacement i s linear in t he mea surable range s. The di sp lacement sen sitivit y i s 924p W/ mm . t he di sp lacement re solution i s 00 1 mm . It i s p ro mi sin g to be u sed into di sp lacement mea s urement since t he demo dulation ha s many charact eri stic s , such a s simp le st r uct ure , high sen sitivit y and goo d linearit y . Key words :fiber sen sing t echnolo gy ;edge filt er demo dulation ;lon g p erio d grating ;fiber Bragg grating ; di s p lacement sen sin g . EEACC :4250 ;7230 E;7320C 基于长周期光栅边缘滤波解调的光纤布喇格光栅 位移传感研究 黄勇林 ,代 　森 南京邮电大学光电工程学院 ,南京 2 10003 摘 　要 :利用长周期光栅的边缘滤波解调技术 ,我们报道了一种光纤布喇格光栅位移传感方法 。系统由一个 3dB 耦合器 、一 个传感光纤布喇格光栅 、一个长周期光栅和一个探测器构成 。实验结果表明 ,在所测位移范围内,传感系统输出的光功率与 位移成良好