干涉型光纤磁场传感器的研究_吕凤军.pdf

( Journal of Transducer Technology) 2004 23 8 32 吕凤军, 斯永敏, 刘吉延 ( , 410073) : , / , - - - , : , , : ; ; : TN253 : A : 1000 - 9787( 2004) 08- 0032- 03 Study on interference optical fibre magnetic field sensors La Feng-jun , SI Yong-m n , LIU J-yan ( Coll of Aerospace and Material Engin, National niversity of Defence Technology,Changsha 410073, China) Abstract: Under the nfluence of outs de magnet c f eld, accord ng to super- magnetostr ct ve f lms and opt cal f bre complex structure model , magnet sm-mechan sm- opt cal coupled equat on of Mach-Zehnder nterference opt cal f ber magnet c sensor s deduced .T he analys s show s that the th ckness of the th n f lms and the s ze of the magnet c f eld have d rectly nfluence on the sens t v ty of the nterf erometer , and t s mproved through ncreas ng the th ckness of the f lm and apply ng the b as magnet c f eld. Key words: opt cal f bre; magnet c f eld sensor; magnetostr ct ve f lm 0 1. 1 基本假设 Yar v / - ( 1) , ; , - ( 2) , 1. 28 @ 10- 7A/ m[ 1] , , E ; , , z / ( 3) , , : 1. 2 理论研究 , 1 , , , / M- Z , , 2 nP $L $n , ,