CAJ | 학술논문

目前柔性结构损伤检测需多个传感器，且需要探测器具有极高的采集频率。光纤光栅具有动态响应快、易实现分布式测量等特点，为解决上述问题提供了有效的途径，提出采用线性啁啾光栅（LCFBG）实现动态应力场探测。首先，用传输矩阵理论建立了LCFBG反射光谱应变传感模型，用衰减正弦函数模拟沿LCFBG 分布的动态应力场。通过仿真实验，详细研究了LCFBG反射光谱对不同振幅、不同衰减系数与不同传播速度动态应力场的响应特性。实验结果表明，LCFBG反射光谱的反射率、波长变化与光谱形状均与动态应力场上述参数有关，但是 LCFBG 反射光谱对动态应力场不同参数的响应规律不同。在一定范围内， LCFBG反射光谱的最大反射率随动态应力场幅值与速度的增大而增大，最终趋于一稳定值，但其随阻尼系数增大而减小。最后，研制了以LCFBG为敏感元件的传感器，并构建了动态应力场实验平台，实验结果与仿真实验数据基本一致。提供了一种通过实时采集LCFBG全光谱信息探测动态应力场的新方法。
목전유성결구손상검측수다개전감기，차수요탐측기구유겁고적채집빈솔。광섬광책구유동태향응쾌、역실현분포식측량등특점，위해결상술문제제공료유효적도경，제출채용선성조추광책（LCFBG）실현동태응력장탐측。수선，용전수구진이론건립료LCFBG반사광보응변전감모형，용쇠감정현함수모의연LCFBG 분포적동태응력장。통과방진실험，상세연구료LCFBG반사광보대불동진폭、불동쇠감계수여불동전파속도동태응력장적향응특성。실험결과표명，LCFBG반사광보적반사솔、파장변화여광보형상균여동태응력장상술삼수유관，단시 LCFBG 반사광보대동태응력장불동삼수적향응규률불동。재일정범위내， LCFBG반사광보적최대반사솔수동태응력장폭치여속도적증대이증대，최종추우일은정치，단기수조니계수증대이감소。최후，연제료이LCFBG위민감원건적전감기，병구건료동태응력장실험평태，실험결과여방진실험수거기본일치。제공료일충통과실시채집LCFBG전광보신식탐측동태응력장적신방법。
Dynastic stress field detection based on the linear chirped fiber Bragg grating (LCFBG)was proposed.Firstly,the re-flectance spectra strain sensing model of LCFBG adopting the transfer matrix method was constructed,and attenuation sine func-tion was used to simulate the dynamic stress field along LCFBG.In the simulation experiment,the responding character of LCF-BG reflection spectrum to different amplitude,different attenuation coefficient and different propagation speed of dynamic stress was studied in detail.The simulation results show that the reflectivity,wavelength and spectral shape of LCFBG reflection spec-trum are related to the dynamic stress.However,the LCFBG reflection spectrum has different response to different parameters of dynamic stress.In a range,maximum reflectivity of LCFBG reflectance spectra increases when the amplitude and propagation speed of dynastic stress field becomes larger,but it decreases when the attenuation coefficient increases.Eventually,vibration sensor using LCFBG as the sensing element was designed,and then LCFBG dynamic stress fluctuations experiment platform was build.The data obtained from experiment agrees with the simulation results.Therefore,a novel detection method of dynamic stress field through real-time acquisition of LCFBG full spectral information is proposed in this article.