共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
3.
徐金武 《机械工人(冷加工)》1973,(10)
随着生产、科学技术发展的需要,椭圆腔体的应用日益广泛。如在激光技术中,某些固体激光装置的聚光器就采用椭圆腔体。因为它具有聚光效率高,输出功率大的优点。椭圆聚光器按其用途不同,可分单椭圆聚光器、双椭圆聚光器,四椭圆聚光器等类型(图1)。不同类型的椭圆腔体,其加 相似文献
4.
从理论上推导了常规槽式光伏聚光器能流聚光比的计算模型,分析了该聚光器能流密度极不均匀的原因,探讨了改善聚光器能流密度均匀性的可能性。在此基础上,提出了一种新型聚光器结构形式,即太阳能电池呈V形槽式的抛物槽式聚光器,从理论上推导了新型聚光器结构的能流聚光比计算模型,分析了聚光器参数对能流密度分布的影响。最后通过粒子群优化算法对该新型模型参数进行了优化。计算和优化结果表明,该新型结构的能流聚光比的标准差小于常规聚光器的30%,极大地改善了槽式光伏聚光器能流密度分布。 相似文献
5.
自动跟踪太阳聚光光伏发电系统的研究,已经成为太阳能光电利用技术的研究热点之一。介绍了一种旋转曲面光伏发电聚光器,聚光器反射圆筒的内壁形状采用一条曲线作母线,绕中心轴线旋转得到的旋转曲面,通过计算机编程对旋转母线进行优化设计,确保入射太阳光经过该旋转曲面反射后,可均匀照射到聚光器底部的圆形电池板上。 相似文献
6.
7.
航天器太阳翼、天线等大部件地面展开过程中需进行重力卸载,目前应用最为广泛的是二维平面滑轨式零重力展开架。针对二维平面滑轨式零重力展开架占用空间大、调平效率低、适用工况相对单一等缺点,提出了一种悬挂在厂房高空中、可伸缩的高精度自动调平装置,该装置可为二维平面滑轨提供安装平台,快速实现二维平面滑轨的高度定位和水平度精调。首先对系统组成进行了介绍;其次,对装置的升降原理、水平度精调原理和消除间隙原理进行了阐述,可确保平台可实现高度调整和水平度调整要求;再次,对整个装置的自由度进行了分析,并给出了调姿策略;最后,完成了装置的安装和测试。结果表明:调平装置可快速实现高度升降和水平度自动调平,升降精度优于0.3mm,调平精度优于0.028mm/m。 相似文献
8.
本文描述了一种采用全息反射元件的分段谱光伏打聚光器,系统的转换效率可高于26%。分析了聚光器的特性并给出了全息元件的设计参数和制作方法。 相似文献
9.
快速成形技术是一种多学科交叉的系统工程技术,在以粉末作为成形原料的快速成形技术中,送粉装置是设备中的关键部件之一。现有的送粉装置存在难以精确送粉、粉末利用率低、结构复杂且难以调整等缺点,借鉴原有的送粉装置,通过分离型设计、定量送粉装置的可调式优化设计,使改造后的送粉装置在实现精确送粉的基础上可快速精确调节,并可加载于不同用粉量的各种快速成形设备中。 相似文献
10.
针对传统的制动器试验台试验安装中惯量调整费时、费力且准确度较差的特点,设计开发了一种高精度、免拆卸、可快速任意组合惯量装置,该装置能够为车辆制动器、离合器等研究提供更加接近实际的模拟机械惯量;同时能满足试验台设计范围内的任意惯量要求,大大降低了试验准备时间。 相似文献
11.
12.
13.
14.
由于地基大口径望远镜主镜视宁度与望远镜系统成像质量相关,本文研究了环境对主镜视宁度的影响。理论分析了影响主镜视宁度大小的因素,得出主镜视宁度会随主镜表面和环境之间温差的增大而增大的结论。利用有限元法分析了自然对流和吹风条件下主镜的温度变化和温度分布;最后通过相应工况条件下2mSiC轻量化主镜的温度测试实验对仿真分析结果进行了验证。实验结果显示:在初始温差为6℃的无风自然对流情况下,主镜与环境达到温度平衡约需4h;而在初始温差为8℃的吹风情况下,主镜与环境达到热平衡仅需1.5h。分析和实验结果表明:采用强迫对流热控措施可快速而有效地将主镜视宁度控制在合理的范围内,可获得更多的望远镜观测时间,同时保证大口径望远镜系统的成像质量。 相似文献
15.
Robert Hoffman 《Journal of microscopy》1977,110(3):205-222
The modulation contrast microscope produces an image of high contrast and resolution. The image has a three-dimensional appearance wherein a rounded object appears dark on one side, bright on the other with grey in between against a grey background. The performance features are optical sectioning, directionality, high resolution and control of contrast and coherence. A bright field microscope is converted to the modulation contrast microscope by adding the modulator, a special amplitude filter, in the objective. A slit aperture part of which is polarized is placed before the condenser. Below this is a rotatable polarizer. The modulator processes light from opposite gradients oppositely, that is brighter for one and darker for the other; thereby preserving the sign. The diffraction theory has been extended to show that gradient image intensity is the intensity of the zero order and when modified by the modulator creates a high contrast image. The modulation contrast microscope is simple and easy to adjust. It is useful in reflected and transmitted light systems, with plastic and glass vessels as well as in combination with fluorescence systems and polarization techniques. There is virtually no limit to the type of specimen that can be studied. 相似文献
16.
A new method based on the double-beam polarization balance bridge technique for measuring the ultralow total loss, including absorption, scattering, and reflection in ultrahigh antireflection mirror is presented. By rotating the polarizer before and after the insertion of a mirror into one beam out of the Wollaston prism to adjust the intensities of the two beams to be equal, the total loss can be obtained by recording the angle variation of the polarizer. The factors affecting the measurement precision of the technique and the main sources of errors are investigated in detail. The total loss measurement precision of the mirror is 10 ppm and the zero drift is 10 ppm at 632.8 nm. 相似文献
17.
研究了一种能电动调节后视镜和座椅位置,并能记忆存储和调用位置信息的记忆存储式后视镜和座椅控制器.分析了记忆存储式控制器的工作原理,详细阐述了该控制器的硬件电路设计,开发了相应的原型系统.试验结果表明该系统能顺利完成所要求的功能. 相似文献
18.
A new interferometer for extreme ultraviolet (EUV) radiation with a laser produced plasma (LPP) laboratory source is under construction. The LPP source is operated with a Sn solid rod target on which pulsed YAG laser is focused to produce high temperature plasma emitting EUV radiation. The source is equipped with a newly designed debris stopper protecting a condenser multilayer mirror from the particle debris of the target. The condenser mirror focuses the light onto an EUV beam - splitter to form transmitted and reflected paths for producing interference fringes of a sharing type. The optical configuration is of a common path based on a triangular path type with a focusing at the beam- splitter, which is enabled to produce fringes by a low coherence radiation with a standard optical quality beam - splitter. The fringes are recorded by an imaging plate with pixels as small as 25μm. The dynamic range of linearity in detection of the EUV light was found to be more than 10^4 with sensitivity of 10^4 photo ns/pixel, enough for the purpose of interferogram recording possibly with one laser shot. 相似文献
19.
20.
设计了一种可应用于组合冲模及柔性冲压系统的快换冲模机构。通过斜楔机构的设计,模具间隙可做微量调节,工作安全可靠。模具更换快捷、方便并带自锁功能。适合中小型冲压制品的多品种、中小批量生产及系列产品的开发。 相似文献