·180· 智能系统学报 第3卷 be subjected from test coupon transfer to the opti- cal fiber.As the strain increased,the resulting References shift of the interference peaks from the fiber optic [1]RAO YJ JACKSON D A.Recent progress in fiber optic interferometer was measured.The testing result is low-coherence interferometry[J].Meas Sci Technol,1996 given by Fig.6,which corresponds to the distribu- (7):981-999. [2]YUAN L B,ZHAO L M JIN W,et al.Recent progress tion strain measured by each fiber sensor Reference fiber sensor array of white light interferometric fiber optic strain sensing 6 techniques[J].Review of Scientific Instruments,2000,71 (12):46484654. [3]YUAN L B,ANSARI F.White light interferometric fiber Test coupon Measuring fiber sensor array Epoxy optic distribution strain sensing system[J].Sensors and Actuators:A,1997,63:177181 Fig.5 Experimental setup for the twin-sensor-array test [4]YUAN L B,ZHAO L M.I XN star coupler as distribu ted fiber optic strain sensor using in white light interfer oSensor I without compensation X103 Sensor without compensation ometer[J ]Applied Optics,1998,37:4168-4172 ASensor 3 without compensation 1.0[eSensor I with compensation [5]YUAN L B,ZHAO L M J IN W.Quasi-distributed strain 0.9Sensor 2 with compensation ● sensing with white-light interferometry:a novel approach 08 ASensor 3 with compensation [J].Opt Lett,2000,25(15):10741076. 0.7 0.6 6]FARA HI F,NEWSON T P.Coherence multiplexing of 0.5 remote fiber Fabry-Perot sensing system[J].Opt Com- 0.4 mun,1998,65:319321. 0.3 0.2 [7]SANTOS J L,JACKSON D A.Coherence sensing of 01 ★ time-addressed optical-fiber sensors illuminated by a mul- 2004006008001000 timode laser diode [J ]Appl Opt,1991,30:5068-5077 Strain applied on the specimen(microstrain) [8]INAUDI D,ELAMARI A.PFFUGLet al.Low-coher- Fig.6 The performance of the twin fiber optic strain ence deformation sensors for the monitoring of civil engi- sensors array in testing for both compensated neering structures [J ]Sensors and Actuators A,1994, and without compensated case with the ambient 44:125130. temperature of the test coupon changes from (9]CHALABI S A,CULSHAW B,DAVIES D E N.Par- 15℃to35℃ tially coherent sources in interferometry C]//Proceed- ings of Ist International Conference on Optical Fiber Sen- 5 Conclusions s0rs.London,1983:132-135. [11]BUTTER C D,HOCKER G B.Fiber optic strain gauge Fiber optic white light interferometric twin U].Appl0pt,1978,17:2867-2869. sensor array multiplexing technique has been dem- 作者简介： onstrated,in which the matching multi-wave was demodulated by a moving GRIN lens or a right-an- 赵士刚，男，1963年生研究员，博士 gle mirror.The fiber optic sensors multiplexing 主要研究方向为光纤传感技术、软件设计 capacity strongly depends on the light source pow- 等，发表论文多篇，著作1部 er of the sensing system. The proposed sensing scheme will be useful for the measurement of temperature or strain.An 苑立波，男，1962年生，教授，中国光 important application could be deformation sensing 学学会光电技术专业委员会委员，常委； 中国光学学会纤维与集成光学专业委员会 in smart structures.By incorporating fiber optic 委员；中因光学学会高级会员.主要研究 twin sensor array into structures such as large- 方向为纤维光学与光纤传感器，发展了一 scale buildings,bridges,dams,tunnels and high- 系列光纤白光干涉多路复用方法，获黑龙 ways,smart structures can be realized for situa- 江省科技进步二等奖1项，发表学术论文 tions where material strains must be monitored 230余篇，著作1部 throughout the lifetime of the structure. 1994-2008 China Academic Journal Electronic Publishing House.All rights reserved http://www.cnki.netbe subjected from test coupon transfer to t he opti2 cal fiber. As t he strain increased , the resulting shift of t he interference peaks from t he fiber optic interferometer was measured. The testing result is given by Fig. 6 , which corresponds to the distribu2 tion strain measured by each fiber sensor. 5 Conclusions Fiber optic white light interferometric twin sensor array multiplexing technique has been dem2 onstrated , in which t he matching multi2wave was demodulated by a moving GRIN lens or a right2an2 gle mirror. The fiber optic sensors multiplexing capacity strongly depends on t he light source pow2 er of t he sensing system. The propo sed sensing scheme will be usef ul for t he measurement of temperat ure or strain. An important application could be deformation sensing in smart struct ures. By incorporating fiber optic twin sensor array into structures such as large2 scale buildings , bridges , dams , t unnels and high2 ways , smart struct ures can be realized for sit ua2 tions where material strains must be monitored t hroughout t he lifetime of t he structure. References [1 ]RAO Y J ,J ACKSON D A. Recent progress in fiber optic low2coherence interferometry[J ]. Meas Sci Technol ,1996 (7) : 9812999. [2 ] YUAN L B ,ZHAO L M ,J IN W ,et al. Recent progress of white light interferometric fiber optic strain sensing techniques[J ]. Review of Scientific Instruments ,2000 ,71 (12) :464824654. [ 3 ] YUAN L B ,ANSARI F. White light interferometric fiber optic distribution strain sensing system[J ]. Sensors and Actuators: A , 1997 ,63 :1772181. [4 ] YUAN L B ,ZHAO L M. 1 ×N star coupler as distribu2 ted fiber optic strain sensor using in white light interfer2 ometer[J ]. Applied Optics , 1998 ,37 : 416824172. [5 ] YUAN L B ,ZHAO L M ,J IN W. Quasi2distributed strain sensing with white2light interferometry : a novel approach [J ]. Opt Lett , 2000 ,25 (15) :107421076. [6 ] FARA HI F ,N EWSON T P. Coherence multiplexing of remote fiber Fabry2Perot sensing system [J ]. Opt Com2 mun ,1998 ,65 :3192321. [ 7 ] SAN TOS J L , J ACKSON D A. Coherence sensing of time2addressed optical2fiber sensors illuminated by a mul2 timode laser diode[J ]. Appl Opt , 1991 ,30 :506825077. [8 ]INAUDI D , ELAMARI A , PFFU GL ,et al. Low2coher2 ence deformation sensors for the monitoring of civil engi2 neering structures[J ]. Sensors and Actuators A , 1994 , 44 :1252130. [9 ]CHALABI S A , CULSHAW B , DAVIES D E N. Par2 tially coherent sources in interferometry [ C ]/ / Proceed2 ings of 1st International Conference on Optical Fiber Sen2 sors. London , 1983 :1322135. [11 ]BU TTER C D , HOCKER G B. Fiber optic strain gauge [J ]. Appl Opt , 1978 ,17 :286722869. 作者简介 : 赵士刚 ,男 ,1963 年生 ,研究员 ,博士 , 主要研究方向为光纤传感技术、软件设计 等 ,发表论文多篇 ,著作 1 部. 苑立波 ,男 ,1962 年生 ,教授 ,中国光 学学会光电技术专业委员会委员 ,常委 ; 中国光学学会纤维与集成光学专业委员会 委员 ; 中国光学学会高级会员. 主要研究 方向为纤维光学与光纤传感器 ,发展了一 系列光纤白光干涉多路复用方法 ,获黑龙 江省科技进步二等奖 1 项 ,发表学术论文 230 余篇 ,著作 1 部. · 081 · 智 能 系 统 学 报 第 3 卷 © 1994-2008 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net