共查询到17条相似文献,搜索用时 125 毫秒
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构建了一套高分辨率的可复用光纤光栅波长解调系统.采用波长调谐范围为1 546nm至1 558nm的紧凑型可调谐半导体激光器作为光源,来提高系统的紧凑性、波长分辨率以及响应速度,加入标准气室作为波长基准以提高系统的长期稳定性.使用多个电极电流共同调谐的办法,实现了在12nm范围内半导体激光器波长分辨率高达1pm的准连续波长扫描.利用重心算法提高光纤光栅中心波长的解调精确度和稳定性,并对解调过程进行模拟.解调系统的波长分辨率优于1pm,精确度接近2pm.整个光纤布拉格光栅温度传感系统在1 550nm附近实现了0.1℃的温度分辨率. 相似文献
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本文提出并论证了一种光纤光栅高速解调的新方法, 利用色散补偿光纤的色散效应, 将光纤光栅的波长漂移信息转换成时域信息. 采用脉冲激光器作为光源, 仅需一个光脉冲可获取单根光纤上所有光纤光栅的反射光脉冲, 再根据各个光栅反射回光脉冲的延时变化即可实现波长的解调. 本方法可用于准分布光纤光栅传感网络解调, 系统采用全光纤结构, 无需波长扫描, 大大提高了解调速度. 本文搭建了测试系统进行实验验证, 对3个光纤光栅组成的准分布式传感网络进行了解调, 实验结果表明, 解调出的光纤光栅布喇格波长线性度好, 解调速度最高可达1 MHz, 采样数据取10次平均后解调线性度可达0.9969, 解调误差约为27.8 pm. 相似文献
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波长扫描极值解调法实现光纤光栅应变和温度传感的测量 总被引:5,自引:0,他引:5
本文用可编程调谐光纤光栅环行腔激光器作扫描光源,采用波长扫描极值传感解调法对光纤光栅应变及温度进行了测量。应变测量范围为±2440με,灵敏度为0.016step/με;温度测量范围达608℃,灵敏度为0.13step/℃。 相似文献
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报道了一种基于环形腔光纤激光器和1×4模拟电子开关的具备实时监测功能的光纤光栅传感网络查询技术,利用级联的波分复用光栅串充当环形腔光纤激光器端镜,借助可调法布里珀罗滤波器对反射的信号光进行扫描,调整光路结构并增加抽运光强度使信号光得到足够的增益,则可获得各传感元工作波长的激光脉冲,且依时序输出。又引入1×4模拟电子开关,将转换为电信号的激光输出按时序分配至4个输出信道。结合非平衡扫描干涉解调技术,实现了对4光栅传感阵列的查询解调。1555 nm波长时系统传感灵敏度的实验值为1.630°/με,与理论值1.674°/με基本吻合。 相似文献
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一种长周期光纤光栅边沿滤波线性解调新方法 总被引:24,自引:2,他引:22
光纤光栅作为一种新型的传感器件,有着巨大的应用价值。利用长周期光纤光栅的滤波特性,提出了一种可应用于光纤光栅传感解调的新方法。即利用长周期光纤光栅作为边沿滤波器的基本器件,可完成一路或者多路光纤光栅的传感波长解调。该解调方案基于光强度测量,适用于动态和静态测量。而且由于采用全光结构设计,无须机械部件调谐,因此,可大大提高解调速度。具有系统反映迅速,性能价格比高等优点。经实验,实现了在5nm范围内的波长线性解调。测量波长分辨极限为0.002nm,解调速度数十kHz。 相似文献
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We demonstrated a fiber sensing system using the method of wavelength locking of two identical fibers Bragg gratings (FBG) to interrogate the wavelength shift by directly measuring the intensity of the reflection from the sensing Bragg grating. The light source of the fiber sensing system is an EDFA fiber ring laser pumped by a 980 nm laser diode and a narrow bandwidth fiber Bragg grating for the filter of the ring laser resonator. The wavelength shift is converted to the intensity deviation of the reflection from the sensing FBG under strain variation, and is able to achieve real-time sensing of the dynamic strain sensing in civil engineering. The characteristics and key factors to maintain stability of the dynamic strain sensing system are discussed. 相似文献
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基于扫描光纤激光器的光纤传感解调仪研究 总被引:3,自引:2,他引:1
介绍了一种基于扫描光纤激光器的光纤传感解调系统.采用氰化氢(HCN)气体吸收池作为波长参考基准,采用三次多项式拟合的方法来确定光纤F- P可调谐滤波器的波长与驱动电压的对应关系,可调谐滤波器扫描过程中对扫描电压、多路光谱信号进行同步采样,实时标定.实验结果表明,该解调系统在1 510 nm到1 590 nm波长范围内对FBG反射峰值波长的分辨率为1.4 pm,长期波长重复性达到3.2 pm.利用该系统实现了对FBG反射峰值波长和光纤EFPI传感器腔长的高准确度解调. 相似文献
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报道了一种基于掺铒光纤激光器瞬态特性的新型气体浓度传感器.用光纤环全反镜和光纤Bragg光栅(FBG)构成F-P线形腔,通过调节光栅的反射波长,使激光激射波长落在C2H2的一个较强的吸收峰1531.56 nm.激光激射延迟时间与激光器谐振腔损耗密切相关,气体浓度的改变将引起谐振腔损耗的改变,通过测量激光激射延迟时间可以获得气体的浓度.该装置分辨率及灵敏度由抽运光脉冲的高功率电平和低功率电平决定,传感器的动态测量范围由抽运光高功率电平决定.当高功率和低功率电平分别为25 mW和5.9 mW时,该传感器的灵敏度和分辨率分别为100 ppm/μs和20 ppm. 相似文献
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Jianliang Yang Yunqi Liu Sweechuan Tjin Jianping Yao 《International Journal of Infrared and Millimeter Waves》2002,23(8):1241-1250
A photonics true-time-delay system for phased array antenna beam steering employing a novel tunable chirped fiber grating delay line and a multi-wavelength erbium-doped fiber ring laser source based on a sampled grating filter is proposed. The tunable chirped fiber grating, which act as a continuous time-delay element, is achieved by bending a uniform fiber Bragg grating bonded at a slant onto the lateral surface of a simply supported beam. This technique allows the dynamic control of the chirp rate and spectral width of the grating without center wavelength shift. By adjusting the chirp rate of the fiber grating via bend strain, this kind of tunable chirped fiber grating could achieve very low and adjustable delay times, therefore provides higher angle resolution for scanning microwave beam, even the wavelengths of laser source are fixed and un-tunable. The true-time-delay system using proposed tunable chirped fiber grating delay element and sampled grating based laser source is constructed and demonstrated experimentally. 相似文献
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We propose and experimentally demonstrate long-distance remote simultaneous measurement of strain and temperature based on a Raman fiber laser with a single fiber Bragg grating embedded on a quartz plate. A Raman fiber laser output with a high extinction ratio of more than approximately 50 dB is achieved by the fiber grating cavity. In the sensing probe, half of the fiber Bragg grating is fixed steadily on the quartz plate to respond to temperature only, while the other half of the grating is free to respond to both temperature and strain. Based on the proposed scheme, lasing wavelength shift and separation occur with temperature and strain change, respectively. Efficient simultaneous measurement of strain and temperature for long-distance sensing applications of more than 50 km is readily obtained. 相似文献
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通过对该系统采集到的法布里-珀罗(F-P)标准具透射谱和光纤布拉格光栅(FBG)传感器反射谱进行寻峰算法以及拟合算法的研究,采用C语言编程和LabVIEW编程相结合的方式,实现了FBG波长信号的解调。其中,由于系统采集到的F-P透射谱和FBG反射谱线时域信号数据都由离散点构成,且在3dB带宽内均符合高斯曲线分布,采用高斯拟合对采集到的信号数据进行寻峰处理,提高系统精度;又由于分布式反馈(DFB)激光器的波长扫描存在着一定的非线性,采用二项式拟合对DFB激光器的波长扫描曲线进行拟合,以降低其非线性导致的误差。另外,设置一路标准FBG传感通道用于波长校准。实验研究表明该系统稳定性良好,波长测量范围为1 550.012~1 554.812nm,分辨力为1pm,精度为±10pm,验证了该系统可用于FBG波长信号检测的可行性。 相似文献