排序方式: 共有18条查询结果,搜索用时 15 毫秒
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带宽调制型单光纤光栅温变无补偿位移传感 总被引:2,自引:0,他引:2
报道了利用反射谱带宽调制和光强差分探测技术实现单一光纤光栅温变无补偿位移精确测量的新方法。设计了一种结构新颖的曲臂梁位移传感装置,结合光波导理论与材料力学原理分析了光纤光栅在高斯应变作用下光栅反射谱侧向梯度展宽的成因,理论推导了特殊结构梁在外力作用下光栅反射谱带宽/反射光强与压力之间的响应关系。光栅反射谱侧向梯度展宽的同时反射光强线性增加,利用光强差分检测方法消除光源出光抖动的影响,提高了位移测量精度。基于带宽调制的光纤光栅位移传感方法免受温度变化的影响,在-10℃~80℃的温度变化范围内,测量误差小于1.2%,实现了单光纤光栅温变无补偿位移测量。 相似文献
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By numerically solving the set of basic equations describing black hole accretion flows with low accretion rates, we show that although the dynamical structure of these flows is essentially unaffected by radiative processes in comparison with the case in which the radiation is not considered, the radiative cooling can be more important than the advective cooling in the flow's convection-dominated zone, and this result may have implications to distinguish observationally convection-dominated accretion flows from advection-dominated accretion flows. 相似文献
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恒电流库仑法测定工业废水中Cr(Ⅵ)的方法研究 总被引:5,自引:0,他引:5
报道了以Fe(Ⅱ)-Ce(Ⅳ)为双中间体恒电流库仑滴定法测定废水中Cr(Ⅵ)的方法,以平衡电位法指示终点。对影响电流效率的电化学性能、电解液的电极行为及其它影响测定的因素进行了较系统的研究。实验表明,废水中常见离子对测定结果无明显干扰;测定的相对误差<2.0%,回收率为99%~104%。与光度法相比,该法简便、快速、灵敏、准确,且不受试样颜色、混浊度及沉淀的影响,无需配制任何标准溶液,可在同一电解液中连续测定十个以上试样。本法可用于电镀、制革、印染等行业工艺流程及废水中Cr(Ⅵ)的测定。 相似文献
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Birefringence of a microstructure fibre with irregular structures is investigated using the finite element method. The birefringence of each sample is statistically analysed, and the relation between the birefringence and the irregular structure of the microstructure fibre is derived. The results indicate that the irregular structure of the symmetrical microstructure fibre result in the birefringence which is more strongly affected by disorder of air holes than the nonuniformity. Moreover, lower birefringence can be obtained with smaller air holes and larger pitch in the fibre structure. 相似文献
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