CAJ | 학술논문

现有的拉曼光纤温度传感系统大多为多模系统,由于单模光纤传输损耗较小,采用单模光纤可以使测量范围轻易扩展.但由于单模光纤中产生的自发拉曼散射信号特别微弱,完全被淹没在噪声中,影响了系统的测温精度.针对存在的噪声信号问题,提出采用现有的累加平均算法与小波变换相结合的信号处理方法对拉曼散射信号进行处理.采用db5小波函数,分解层数为5层.通过madab上进行仿真,结果表明信号处理方法可以有效地消除信号中的噪声,同时又能很好地保留有用信号,缩短了系统的测量时间,改善了系统的性能指标.
현유적랍만광섬온도전감계통대다위다모계통,유우단모광섬전수손모교소,채용단모광섬가이사측량범위경역확전.단유우단모광섬중산생적자발랍만산사신호특별미약,완전피엄몰재조성중,영향료계통적측온정도.침대존재적조성신호문제,제출채용현유적루가평균산법여소파변환상결합적신호처리방법대랍만산사신호진행처리.채용db5소파함수,분해층수위5층.통과madab상진행방진,결과표명신호처리방법가이유효지소제신호중적조성,동시우능흔호지보류유용신호,축단료계통적측량시간,개선료계통적성능지표.
The existing Raman temperature sensing system of optical fiber is mostly multi-mode system.Due to the smaller loss of single-mode fiber transmission,the measuring range can be easily extended by using singlemode fiber.However,the spontaneous Raman scattering signals are particularly weak in single-mode fiber,completely submerged in the noise,and affecting the system's temperature measurement accuracy.To solve this problem,this paper proposes a cumulative average algorithm and a wavelet transform signal processing method to process the Raman scattering signal.Db5 wavelet function is used with five decomposition layers.By matlab simulating,the results show that the signal processing method can eliminate signal noise effectively,retain desired signal very well,shortenthe system's measurement time and improve the system performance.