排序方式: 共有12条查询结果,搜索用时 15 毫秒
1.
A type of spatial modulating micro Fourier transform spectrometer (FTS) based on micro multi-step mirrors (MMSMs) is designed and manufactured in this paper. The interference system is based on Michelson interferometer, using two MMSMs instead of plane mirrors in two arms. The recovered spectrum is simulated with different distances between MMSMs and the detector, and the influence of diffraction on the recovered spectrum is analyzed. The edge-enlarging method for the MMSMs is proposed to eliminate edge noise, and the influence of surface roughness of MMSMs on the recovered spectrum is also analyzed. Moreover, the way of manufacturing the MMSMs is investigated. 相似文献
2.
3.
4.
研究一种基于电磁驱动微光机电系统(MOEMS)光开关阵列的串联集成波长选择开关结构,经过理论分析与计算,得出螺旋形线圈在相同电流密度下相比于八边形和四边形线圈能得到更大的电磁力;通过模态分析得到在设计的悬臂结构下,支撑臂响应时间约为22 ms。采用溅射、光刻、腐蚀和电铸等MOEMS工艺完成了光开关悬臂的制作,并通过制作对准标记及采用可见光与红外光相结合的装调方法,完成了1×8阵列的波长选择开关系统集成。经过测试得到,开关上升和下降的时间均约为20 ms,当电流为0.4 A时,支撑臂的挠度为1.28 mm,能达到系统光路转换的目的。该波长选择开关能够在2 V电压下,实现对8个不同波长信道的任意选择,其最大的插入损耗为1.741 dB,信道均匀性达到0.55 dB;插入损耗的测试结果与计算结果较吻合。 相似文献
5.
1 目前保温材料使用中存在的问题 保温是指为了减少保温对象的内部热源向对象外部传递热量而采取的一种工艺措施。为了达到保温的目的 ,需要采取一些具有特殊性能的材料 ,这些材料称为保温材料。目前 ,保温材料使用中存在以下问题 :①强度低、寿命短 ;②滑脱沉降 ,持久隔热效果差 ;③管线腐蚀 ;④管线阀的保温 ,迄今日尚无最佳材料。2 保温材料的合理选择2 1 选择原则保温材料一般的选择原则是 :①使用温度范围合适 ;②导热系数力求较低 ;③价格便宜 ;④使用寿命较长 ;⑤物理、化学性能便于维护和施工 (如有一定的柔性或强度以便于安… 相似文献
6.
介绍了EF-2型特种氧化铁常温精脱硫剂及精脱H2S工艺对大港油田天然气精脱H2S的情况。应用结果说明,在无氧条件下,精脱H2S效果优良,消除了H2S对设备的腐蚀,液化气回收装置的检修期由每周一次延长至一年以上。经济效益高达1、000多万元。 相似文献
7.
The structural parameters of low-stepped mirror which is the core component of a light Fourier transform infrared spectrometer (FTIRS) have important influence on the performance of the instrument. A simple method of multiple deposition is proposed to fabricate a low-stepped mirror with step height of 625 nm, for its high precision, high efficiency and miniaturization. So the film stress will be introduced in the process of coating, which can lead to step deformation. We build a bending model of the low-stepped mirror and analyze the influence of its deformation. The light intensity and spectrum are changed by the step deformation. Therefore, the film stress should be reduced in order to ensure the accuracy of the spectral information. Increasing the thickness of substrate is proposed in this paper to reduce the step deformation, besides adjusting the coating temperature and adding sub-layer. Our results reveal that the basic requirements of the system are satisfied when the thickness of the substrate is 5 mm in the appropriate coating environment. An FTIRS based on stepped mirrors and grid beam splitter is assembled and corresponding experiment is carried out to obtain the spectrum curve of acetonitrile. 相似文献
8.
9.
10.
结合陆家嘴国际华城二期超限高层部分框支剪力墙结构的优化设计,探讨了钢骨混凝土组合结构在框支结构中的应用。详细介绍了钢骨混凝土框支柱、框支梁及梁柱节点的设计构造,同时简要叙述了HRB400级钢筋在工程中的应用,可供工程设计人员参考。 相似文献