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光纤Bragg光栅折射率调制特性研究 被引量:6
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作者 姚琳琳 谢涛 +3 位作者 景燕敏 吴晟 李英娜 李川 《传感器与微系统》 CSCD 2016年第7期16-18,共3页
在光纤Bragg光栅(FBG)中两个正反向模式之间会发生耦合,要了解光纤光栅的物理特性,提高反射率的精度,就需要深入研究光纤光栅的耦合模理论。通过光纤Bragg光栅的耦合方程,研究在不同的折射率调制深度的情况之下光纤反射谱变化,并用Matla... 在光纤Bragg光栅(FBG)中两个正反向模式之间会发生耦合,要了解光纤光栅的物理特性,提高反射率的精度,就需要深入研究光纤光栅的耦合模理论。通过光纤Bragg光栅的耦合方程,研究在不同的折射率调制深度的情况之下光纤反射谱变化,并用Matlab做仿真实验,结果发现光栅长度取2,5,10 mm,弱光栅、中度光栅、强光栅在折射率变化0.000 1时的反射谱带宽最大值分别是2.015 0×10^(-11),5.276 7×10^(-11),9.214 3×10^(-11)。计算表明:在固定光栅长度情况下,每0.000 1折射率变化所导致的反射谱带宽变化值在任意反射带中都相对稳定,其中,弱光栅反射谱最小,中度光栅反射谱次之,强光栅反射谱最大。 展开更多
关键词 光纤BRAGG光栅 反射谱带宽 折射率变化 折射率调制
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Spectral decomposition method for predicting magmatic intrusion into a coal bed 被引量:3
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作者 Wang Xin Chen Tongjun +1 位作者 Cui Ruofei Xu Yongzhong 《International Journal of Mining Science and Technology》 2012年第4期447-452,共6页
Accurate prediction of magmatic intrusion into a coal bed is illustrated using the method of seismic spectral decomposition.The characteristics of coal seismic reflections are first analyzed and the effect of variable... Accurate prediction of magmatic intrusion into a coal bed is illustrated using the method of seismic spectral decomposition.The characteristics of coal seismic reflections are first analyzed and the effect of variable time windows and domain frequencies on the spectral decomposition are examined.The higher domain frequency of coal bed reflections using the narrower STFT time window,or the smaller ST scale factor,are acceptable.When magmatic rock intrudes from the bottom of the coal bed the domain frequency of the reflections is decreased slightly,the frequency bandwidth is narrowed correspondingly,and the response from spectral decomposition is significantly reduced.Intrusion by a very thin magmatic rock gives a spectral decomposition response that is just slightly less than what is seen from a normal coal bed.Results from an actual mining area were used to validate the method.Predicting the boundary of magmatic intrusions with the method discussed herein was highly accurate and has been validated by observations from underground mining. 展开更多
关键词 Coal bed reflection Spectral decomposition Influence factors Magmatic intrusion predicting
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Research on ultra-small textured surface of multicrystalline silicon solar cell 被引量:2
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作者 LI HaoFeng JIA Rui +8 位作者 DOU BingFei CHEN Chen XING Zhao YANG YongZhou DING WuChang MENG YanLong LIU XinYu YE TianChun LI ShangQing 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第4期952-956,共5页
The ultra-small textured surface of multicrystalline silicon solar cell,prepared by electroless chemical-etching method,shows an excellent anti-reflection property over a wide spectral bandwidth.A novel back surface p... The ultra-small textured surface of multicrystalline silicon solar cell,prepared by electroless chemical-etching method,shows an excellent anti-reflection property over a wide spectral bandwidth.A novel back surface protection method and front surface passivation method have been used in the multicrystalline solar cells with ultra-small textured surfaces.With these improvements,the back surface remains intact after the etch process and the efficient minority lifetime is apparently increased.The test result shows that the solar cell with ultra-small textured surface can obtain better electrical performances by these improvements. 展开更多
关键词 mc-Si solar cell ultra-small texture ANTI-REFLECTION surface passivation
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