共查询到20条相似文献，搜索用时 62 毫秒
1.
2.
CCD(ChargeCoupledDevices)是20世纪70年代发展起来的新型半导体集成光电器件。目前CCD应用技术已成为集光学、电子学、精密仪器与计算机技术为一体的综合性技术。振动测量一直是工程技术界重视的课题,振动直接影响机器(或结构)的运行稳定性、安全性和人体感觉的舒适性,直接影响生产的有效性和精确度。运用线阵CCD对物体振动进行非接触自动测量比传统测量方法具有更高的精度、更快的速度。通过该实验可以使学生进一步掌握CCD的基本工作原理、用CCD测量物体位置和物体振动的基本方法。 相似文献
3.
张恺 《实验室研究与探索》2010,29(12)
从实验原理、实验系统和实验数据分析3方面,将常用的检流计测衍射光强法和面阵CCD衍射光斑采集法作比较。2种实验结果分析比较表明,在衍射法测微粒直径的实验中使用面阵CCD能够有效地提高数据的采集速度和测量精度,为实验室设计相关的衍射实验提供有益的参考。 相似文献
4.
李明明 《实验室研究与探索》2013,32(5):105-107
随着计算机技术和光电技术的发展,已经出现了一种新的检测技术——基于计算机视觉的检测技术,利用CCD摄像机作为图像传感器,综合运用图像处理等技术进行非接触测量的方法,被广泛地应用于零件尺寸的精密测量中。本文以面阵CCD为传感器,研究了零件在线测量的方法,实现了零件尺寸的图像边缘亚像素定位测量,对面阵CCD在高精度测量方面的应用作了进一步的探索和研究,为面阵CCD在复杂零件尺寸高精度测量的实现打下了基础。 相似文献
5.
6.
7.
介绍了一种测量光具组基点的新方法。由于采用线阵光电耦合器件（CCD）测量物经光学系统成像的横向放大率,使实验具有精度高、操作简便等优点。 相似文献
8.
余小英 《南宁师范高等专科学校学报》2013,(3)
CCD技术是现代光电技术的一个重要分支，其在非接触领域有着非常广泛的应用。在阐述光的衍射原理的基础上，将热学与光学的实验原理、仪器的综合利用，通过CCD成像系统实现衍射法测金属线胀系数。实验结果表明，通过CCD成像系统提高微小形变量的测量精度，可以实现金属线胀系数的非接触测量，且精度较高。 相似文献
9.
叙述线阵CCD测量光强度的原理,分析系统的软硬件设计,并使用CCD对布儒斯特角进行了测定． 相似文献
10.
根据光电信息科学与工程专业光电综合实验课程的需要,研制了基于彩色线阵CCD的实验教学系统,该系统使用ALTERA公司的CPLD芯片EPM240T100I5N作为系统的主控芯片,利用Verilog语言编写驱动程序来产生CCD工作所需要的各种信号,对东芝公司的彩色线阵CCD芯片TCD2564DG进行了驱动实验。利用该实验系统不仅可以观察彩色线阵CCD的各个驱动信号之间的时序关系,还可以分别观察红、绿、蓝3分量的响应情况,还可以研究彩色线阵CCD 3个颜色分量的输出信号与光照强度和积分时间的关系。 相似文献
11.
12.
13.
《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
14.
邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
15.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
16.
Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
17.
Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
18.
Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
19.
20.
RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献