2000-2001 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Dong, XY

Ge, CF

Guan, BO

Liu, ZG

Tam, HY

Yu, YL

Acta Optica Sinica

2000-2001 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedVoR allowe

PolyU Institutional Repository

　　* ?????????????? ( 69878007)、 ??????????。　　　 ????: 1999-04-05; ???????: 1999-06-28一种高分辨率的光纤光栅传感解调技术*关柏鸥 1)　余有龙 1)　葛春风 1)　刘志国 1)　董孝义 1)　谭华耀 2)1) , ??????????? , ?? 3000712) , ??????????? , ???　?　??????????????????????????????????。??????????????????。???????????????? , ????、 ?????? , ?????????????????????。 ??????????????0. 1 pm, ???????????????。???　???? , 　??? , 　??。1　?　　???? , ??????????????????????。???????????? , ???????????、 ?????、???、???????????????。?? , ????????????????????????????。?????????????????? , ????????????。???? , ???????????? ,??????? -???????? [ 1, 2]、??????? -?????? [3 ]、 ??????????????? [4, 5 ]?。??????????????????????????? [6 ]。???????????????????? , ??????????????? , ??????????????? , ??????????????????????????????????。?????????????? , ??????????????????。??????????? , ????????。?????????????????? , ??? -??????????????????????????????? , ???????????????????。?? , ???????????。???????????????????。2　???????2. 1　?????????? 1?? , ??????????????????????、 ????、????????????、 ??????????。???????????????。? 20?　? 11?2000? 11? 　 　 　 　 　 　 　?　 ? 　? 　?ACT A OPTICA SIN ICA　 　 　 　 　 　 　Vol. 20, No . 11Novem ber , 2000Fig. 1 Diagram of d emodulating s ys tem for f iberg rating s en sor. LD: laser diode, WDM:waveleng th divi sion mul tiplexer, EDF:erbium-doped fiber, ISO: optical is olato r??????????? , ??????????? , ????? ( FBGt )????????。???? FBGt???????。??????? ,???? FBGt????????????????????。?? , ????????????? , ???????????。??????????????????? , ?????????? (????? )??????????? ,???????????????????? [7 ]。????????、 3 dB?????????? ( FBGs ) , ?????? 3 dB??????????。????????????????? , ?????????????? , ??????????????? , ????????????????????。2. 2　??????????????????????? , ???????????????????λ?????。???????? , ??????????????? , ????????????。???????????? FBGs?????????G(λ) = R0 exp [- 4 ln 2(λ- λBΔλB ) 2 ], ( 1)?? R0、 λB、 ΔλB?????????????、???????????。????????????????????? 2??。?? 2???? , ??????????????????。　 Fig. 2 Com paris on betw een th e Gaus sianmod el and the exact mod el for f iberg rating ref lection spect rum????????????? ΔλL ,???? L (λ)???。????? FBGs????????????I (λ) = k1L (λ)G(λ) , ( 2)?? k1???????????????????。?? , ?????????????PD = k1k2∫∞-∞L (λ)G(λ) dλ, ( 3)?? k2???????????。?????????????????? ,??? ΔλL ΔλB ,?? ,?????PD = k1k2G(λL )∫+ ∞-∞L (λ) dλ= k1k2P0G(λL ) = A exp [- 4 ln 2(λL - λBΔλB ) 2 ] , ( 4)?? P0???????????? , A = k1k 2P0 R0??? , λL???????????。?( 4)????? , ??????????????? , ???????????? (?????? )?????????????????? FBGs?????。???????????? , ?????????????????????????? , ???????? ( 4) ?1510　　　　　　　　　　　　　　　?　　　?　　　?　　　?　　　　　　　　　　　　　　　 20?　?????? , ???? ( 4) ???λB? , ?????????????。3　???????????????? FBGs????? 0. 16 nm , ??????? 85% , ??????????? 1560. 12 nm。 980 nm??????????? 100 m A, ?????? 30 mW。?????? 7 m, ?????? 13. 3 mo l /m3。????????? 2 mW ,??????? 6 nm, ????? 0. 0785 nm, ???????????????????? 0. 01 nm。????????????????? , ???????????????????????????? 3?? (??????????? , ?????? , ??????????? )。???????????? , ???????????????? , ?????????? , ?????????????????。? ( 4) ??? , ?????????????FBGs??????。??????????????????????? , ( 4)??? P0???? , ??λL??? , ??? P0 (λL )。????????????????????????????。??????? , ????????????????????? P (λL )???????。? 4????????????????????????????。Fig. 3 Th e relationship betw een w avelength andscan ning steps for fib er laserFig. 4 Th e relationship betw een the photo-detectoroutput vol tage and las er w avelength??? [6]? , ??? 4?????????? (????????????????? ) ?????????????。?????????????? ( 0. 0785 nm ) , ???????????????? 0. 0785 nm。??????????????、????????? , ?????????。????????? , ?????????????? , ???????。???????????? , ?????????????: ??? 4?????? ( 4)????? , ??????? ( 4)???λB? , ?????????????。????-?????????????? 5??。?? 5???? , ????????????????????????????? , ?????????????????????。????????????? , ?????????? , ?????????????????????????? , ??????????????? 6??。????? , ????????? /??????? 12? , ????? 8 V, ????? 0. 002 V。?????????????????????????? 0. 002 V? , ?? /?????????????? , ?? , ?? /????????????????????? (???????151111?　　　　　　　　　　????: 　　?????????????????　　　　　　　　　Fig. 5 Gaussi sn cu rve f it ting for th e photo-detectorou tpu t dataFig. 6 The relation ship betw een tem perature andcen ter w avelength of sensing gratingdetermined by curve f it ting?????? )。?? 5??????????? 0. 002 V (??????? 0. 002 V ) , ??????? , ????????????????? 0. 1 pm。???? , ??????????????? 0. 1 pm? , ??????????????????? /?????????????? , ?? /????????????????。????????????????? 0. 1 pm。?????????????? ,?????? 0. 029 nm /℃ [8 ] , ?? ,??????????????????? 0. 004℃。?????????????? (???????? 1550 nm???????? , ????????????? 0. 01 nm /℃?0. 0012 nm /με[9 ] ) , ?????????????? 0. 01℃? 0. 08με。?　?　??????????????????? , ?????-????????? , ????????????????。???????????、 ????、 ??????? ,?????????????。????????????????? 6 nm, ??????3～ 4????? , ??????????。? ? ? ?[ 1] Weis R S, Kersey A D , Berkoff T A. 　 A four-element fibe r g ra ting sensor ar ray with phase-sensitiv edetection. IE EE Photon. Tech. Lett . , 1994, 6 ( 12) ∶ 1469～ 1472[ 2] Kersey A D, Berkoff T A. 　 Dual w aveleng th fiber inter ferometer with w aveleng th selection via fiberg ra ting elements. Electron. Lett. , 1992, 28 ( 13) ∶ 1215～ 1216[ 3] Ker sey A D, Berko ff T A , Mo rsey W W. 　 Multiplex ed fiber Bragg g ra ting str ain-senso r sy stem w ith afiber Fabry-Pe ro t waveleng th filter. Opt. Lett. , 1993, 18 ( 16) ∶ 1370～ 1372[ 4] Jackson D A , Ribeiro A B L, Reekie L et al . . 　 Simple m ultiplexing scheme for a fiber-optic g ra tingsensor netwo rk. Opt. Lett . , 1993, 18 ( 14) ∶ 1192～ 1194[ 5] Ribeir o A B L, Ferr eir a L A, Santo s J L et al. . 　 Analysis of the reflectiv e-ma tched fiber Bragg g ra tingsensing interr og ation scheme. Ap pl. Opt . , 1997, 36 ( 4) ∶ 934～ 939[ 6]??? , ??? , ?　?? . 　???????????? . 光学学报 , 1999? , 19 ( 9) ∶ 1203～ 1206[ 7]??? , ??? , ?　?? . 　????????????????????? . 中国激光 , 1999, A26( 6) ∶ 777～ 780[ 8]??? ,??? , ???? .　??????????????? . 光子学报 , 1998, 27 ( 10)∶ 936～ 938[ 9] Ke rsey A D, Dav is M A , Par trick H Jet al. . 　 Fiber g rating senso rs. J . L ightwave Technol. , 1997, 15( 8) ∶ 1442～ 14631512　　　　　　　　　　　　　　　?　　　?　　　?　　　?　　　　　　　　　　　　　　　 20?　A Scheme for Demodulation of Fiber Grating Sensorswith High ResolutionGuan Baiou　　 Yu Youlong　　 Ge Chunfeng　　 Liu Zhiguo　　 Dong Xiaoyi( Inst itute of Modern Optics , N ankai University , Tianjin 300071)Hwa Yaw Tam( Electrical Engineering Department , The Hong Kong Polytechnic University , Hong Kong )( Receiv ed 5 April 1999; revised 28 June 1999)Abstract　 A novel approach for demodulation of fiber grating senso rs wi th high-resolution is propo sed based on a tunable fiber laser interrogating the sensingfiber g rating. The fiber laser scanning for interroga tion is co nt rolled bycomputer. The computer sy nchro nously perfo rms data gathering and dataprocessing while it controls laser w aveleng th scanning. The Bragg waveleng th ofsensing grating is determined by using the Gaussian-New ton curv e fittingapproach. The waveleng th-shif t resolution o f this scheme is 0. 1 pm, which canbe used in the measurement of temperature o r s train with high-resolutio ncapability.Key words　 fiber grating , 　 sensor, 　 demodulatio n.2000??????????????????????????????????????????????????????????、 ??????????????????? 2000????????????????? 2000? 8? 21?? 29?????????? ,???? 26??????????? 116????????。???????????????????????、 ???????? , ???????????????? , ????????????????????。?????????? 10? , ??????????????????? “???????????”、 ??????? “???????????????????????????”、 ???????“??????????? ?????”; ??????????????????????? “?????????????”、 ??????????? “???????????” ; ????????????? “???????” ; ????????????? “?????????”; ????????????? “????????” ; ????????????? “???????????????” ; ??????????????? “????????????????”。??????????????。??????????????????? ,????????????????????? , ?????????。??????????????????? , ??????????? ,??????????????? ,??????????????????? ,????。??????? , ??????????? , ??????。???? , ??????????????????????????????????? ,??????????????? , ??????? 2001?????????????????。(曹　怡 )151311?　　　　　　　　　　????: 　　?????????????????　　　　　　　　　

A scheme for demodulation of fiber grating sensors with high resolution

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