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大范围光纤布拉格光栅温度传感器增敏实验研究 总被引:11,自引:0,他引:11
简要分析了光纤布拉格光栅的温度响应及增敏原理,采用特殊耐高温有机聚合物对光纤光栅进行温度增敏封装,并通过改进光纤光栅的聚合物封装固化工艺,使用某种有机硅导热胶减小有机聚合物与套管材料的粘合度,消除了封装过程中由于聚合物材料不均匀收缩引起的光纤光栅反射谱啁啾化,实现20~180℃范围内光纤光栅传感器对温度高灵敏度测量。实验结果表明.聚合物封装光纤光栅传感器温度响应灵敏度在20~130℃为0.05nm/℃,在130~180℃达到了0.22nm/℃,并在两个区域保持较好的线性与重复性。此结构传感器封装工艺简单,易于实现,可用于高温恶劣环境下的温度单参量测量。 相似文献
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Theoretical modelling of the effect of photon lifetime on the output dynamics of Er-doped distributed feedback fibre lasers 下载免费PDF全文
By employing a simple model of describing three-level lasers, we have theoretically investigated the effect of photon lifetime on the output dynamics of Er-doped distributed feedback fibre lasers. And based on the theoretical analysis we have proposed a promising method to suppress self-pulsing behaviour in the fibre lasers. 相似文献
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A resonant buildup of beam-induced fields in a superconducting radio frequency (RF) cavity may make a beam unstable or a superconducting RF cavity quench. Higher-order mode (HOM) couplers are used for damping higher-order modes to avoid such a resonant buildup. A coaxial HOM coupler based on the TTF (TESLA Test Facility) HOM coupler has been designed for the superconducting RF cavities at the Proton Engineering Frontier Project (PEFP) in order to overcome notch frequency shift and feed-through tip melting issues. In order to confirm the HOM coupler design and finalize its structural dimensions, two prototype HOM couplers have been fabricated and tested. Low-power testing and measurement of the HOM couplers has shown that the HOM coupler has good filter properties and can fully meet the damping requirements of the PEFP low-beta superconducting RF linac. 相似文献
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Finite volume effects on the chiral crossover transition of strong interactions at finite temperature are studied by solving the quark gap equation within a cubic volume of finite size L. With the anti-periodic boundary condition, our calculation shows the chiral quark condensate, which characterizes the strength of dynamical chiral symmetry breaking, decreases as L decreases below 2.5 fm. We further study the finite volume effects on the pseudotransition temperature T_c of the crossover, showing a significant decrease in T_c as L decreases below 3 fm. 相似文献
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单光纤光栅波谱展宽温度压力同时区分测量 总被引:10,自引:4,他引:6
报道了利用单光纤布拉格光栅反射波带宽展宽技术实现温度与压力同时区分测量的新方案。通过聚合物材料将光栅粘接于双孔悬臂梁非均匀应变区 ,在压力作用下悬臂梁带动光栅发生非均匀应变 ,使布拉格反射波波长漂移的同时带宽展宽 ,而温度变化仅引起反射波波长漂移。在 2 0~ 10 0℃和 0~ 7.8N的温度和压力测量范围内 ,温度测量精度± 1.1℃ ,压力测量精度± 0 .18N ,布拉格反射波中心波长漂移量和带宽展宽量随温度和压力的变化呈良好的线性关系 ,线性度均高于 99.6 %。多次测量表明 ,此方案的展宽波形稳定 ,重复性好。 相似文献