共查询到18条相似文献,搜索用时 62 毫秒
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本文论述了太阳紫外光谱监视器概念设计的内容,方法及各种后处理技术手段,并用计算机辅助设计方法完成了太阳紫外光谱监视器壳体的线框、面、实心体模型及监视器整体的概念设计。 相似文献
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紫外臭氧垂直探测仪波长精度分析与波长定标新方法的研究 总被引:2,自引:0,他引:2
对紫外臭氧垂直探测仪波长扫描机构中的凸轮廓线、摆杆长度和齿轮组传动等误差,及受温度因素对波长精度影响进行分析,得出理论波长精度为±0.035nm。地面采用C-T型1.5m单色仪和标准氘灯相结合的新方法,对大气臭氧吸收12条波长及160~400nm光谱进行波长定标,分析定标的不确定度为±0.026nm。通过在轨波长测试的结果表明:仪器的波长精度为±0.023nm,与理论分析值相符,验证了波长精度的理论分析、定标方法和不确定度计算的正确性。 相似文献
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高精紫外辐射计的接地分析与验证 总被引:1,自引:0,他引:1
分析了美国YANKEE公司生产UVMFR-7紫外辐射计野外架设时接地方案和易犯错误,以该仪器在观测实验时接地不当导致的通讯故障解决方案为例,给出辐射计接地故障现场测试查找方案,验证了高精紫外辐射计的正确接地对于仪器的检测精度、仪器和实验人员安全的重要性,同时指出电源插头插座欧标与国标的微小差异对接地有重要的影响,对正确安装和使用该仪器具有指导作用。 相似文献
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对X62W铣床主轴回转精度的测定及数据处理时,用最小二乘圆作为基圆,在求解最小二乘圆时,用迭代法解超越方程,试验证明,当主轴回转精度不是很高时,用本文使用的测定方法,还是可以满足要求的。 相似文献
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利用积分球光源定标空间紫外遥感光谱辐射计 总被引:10,自引:13,他引:10
基于内部照明积分球的辐亮度定标方法,获得了接近理想的大面积辐亮度光源(~2%),标定了在研的空间紫外遥感光谱辐射计的亮度响应度。在假设标准灯为均匀亮度的点光源情况下,对照明因子进行了修正。同时利用两种漫反射板对此修正进行了实验研究,得到了采用两种漫反射板标定的光谱辐射计亮度响应度有很好的一致性(1%)的结论。初步的定标数据分析显示,石英卤钨灯光谱辐照度测量的相对不确定度和距离测量的不确定度是积分球定标最主要的不确定度来源,可用于紫外波段光谱辐射计的高精度辐射定标,并可以极大地降低定标不确定度。 相似文献
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Al+Mg F2 膜是真空紫外波段常用的一种反射膜。根据薄膜光学的电磁场理论计算了正入射条件下 Al+Mg F2 膜在真空紫外波段的反射率随氟化镁膜厚度的变化规律。研究了 Al+Mg F2 膜的制备工艺 ,利用 Seya-Namioka紫外 -真空紫外反射率计测得 Al+Mg F2 膜的反射率在 1 50 nm~ 34 0 nm的波段上高于 80 %。Al+Mg F2 膜制备一年后 ,其真空紫外波段的反射率未有明显变化 相似文献
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Quick and accurate detecting the error of NC machine tool and performing the error compensation are important to improve the machining accuracy of NC machine tool.Currently,there are many methods for detecting the geometric accuracy of NC machine tool.However,these methods have deficiencies in detection efficiency and accuracy as well as in versatility.In the paper,a method with laser tracker based on the multi-station and time-sharing measurement principle is proposed,and this method can rapidly and accurately detect the geometric accuracy of NC machine tool.The machine tool is controlled to move in the preset path in a 3D space or 2D plane,and a laser tracker is used to measure the same motion trajectory of the machine tool successively at different base stations.The original algorithm for multi-station and time-sharing measurement is improved.The space coordinates of the measuring point obtained by the laser tracker are taken as parameter values,and the initial position of each base point can be determined.The redundant equation concerning the base point calibration can be established by the distance information of the laser tracker,and the position of each base point is further determined by solving the equation with least squares method,then the space coordinates of each measuring point can be calibrated.The singular matrix does not occur in calculation with the improved algorithm,which overcomes the limitations of the original algorithm,that the motion trajectory of machine tool is in a 3D space and there exits height difference between the base stations.Adopting the improved algorithm can expand the application of multi-station and time-sharing measurement,and can meet the quick and accurate detecting requirements for different types of NC machine tool. 相似文献
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Tuo Yaofei Chen Jianjun Zhang Chijiang Chen Yongqin 《Frontiers of Mechanical Engineering in China》2007,2(2):214-217
This paper deals with the static and dynamic output kinematic accuracy of a group of elastic slider-crank mechanisms with
the same design parameters by taking the bar length, the joint-gaps, the mass density, and the sectional and the physical
parameters as random variables. According to the principle of linear pile-up of small displacement, the static and dynamic
output kinematic errors are synthesized, and the reliability model of the kinematic accuracy of the mechanism is built. Through
an example, a study of the influencing factors on the reliability of the output kinematic accuracy of the mechanism is made.
The results obtained reveal the following facts: with the increase of the crank’s rotating speed, the dynamic elastic deformation
of the mechanism becomes the principal factor that greatly affects the reliability of the output kinematic accuracy of the
mechanism.
Translated from Machine Design and Research, 2006, 22(1): 26–28 [译自: 机械设计与研究] 相似文献
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平面凸轮机构运动精度可靠性分析与数字仿真 总被引:6,自引:0,他引:6
运用微小位移的线性叠加原理,将平面凸轮类机构的凸轮与滚子的形状误差、铰链与移动副的间隙(包括磨损的影响)、凸轮及滚子的偏心、凸轮偏距圆尺寸误差等作为随机变量,建立了机构运动精度可靠性分析模型;利用计算机数字仿真技术,考察了机构各项误差导致的机构运动输出总误差对机构输出运动精度可靠度的影响,从中获得了一些有意义的结论。 相似文献