共查询到20条相似文献，搜索用时 62 毫秒
1.
自制USB采集卡构成虚拟仪器数据采集系统 总被引：1，自引：0，他引：1
目前在教学实验系统中越来越多地采用虚拟仪器技术来构建数据采集和处理系统，虚拟仪器的核心包括数据采集卡和上位机驱动、分析软件。在我们研制的旋转机械故障诊断检测实验系统中采用了自制的USB接口的数据采集卡，编写了驱动程序，并与Labview应用软件进行了链接。这样既节省了成本又保持了虚拟仪器的功能，是实验设备建设中一种较好的方法。 相似文献
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颜色现象需要亲身体验才能理解记忆,但长期缺乏定量可控的教学实验。针对这些问题开发出2套实验系统,用PC机通过USB接口和单片机,精确控制特制LED混色屏和直流电机驱动的颜色实验转台。色光混合实验系统借助计算机控制R、G、B分量,实现白平衡和颜色按参数变化。颜色转盘实验平台以计算机控制直流电机,驱动多种彩色径向开口圆盘匀速转动,以斩波器和光耦检测转速并实现闭环控制,完成颜色混合实验;还可观察变色频闪光源下呈现的周期彩色图案及主观颜色现象。两套实验系统可重复再现实验现象、定量和实时性好、操作简便,显著提高了色度学实验的教学效果。 相似文献
3.
庞春生 《中学物理教学参考》2009,(4)
人教版《物理》选修3—4第十三章第六节“光的偏振”一节中有两处内容应引起老师的注意．（1）演示实验：当两个偏振片P和Q的透振方向平行时,可观察到自然光经过两个偏振片后的透射光强度最大;若保持偏振片P不动,使偏振片Q绕光的传播方向为轴慢慢转动,可看见透射光的强度不断变化,由亮逐渐变暗,再由暗逐渐变亮,旋转一周将出现两次最亮和两次最暗． 相似文献
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基于MCS-51单片机系统,以CH372芯片为核心,设计出了USB接口单元电路和驱动程序。并以PC机为宿主机,通过USB接口,利用动态链接库技术完成了PC机与单片机系统间的传输测试。研究表明:在低于1Mbps速率下,能成功实现微机和单片机之间的数据交换,对于较高速率的传输方式,应采用更高效的驱动芯片或通信类专用单片机系统完成并实现微机和单片机之间的数据交换。 相似文献
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基于USB接口与LabVIEW的数据采集系统设计 总被引：3，自引：2，他引：1
设计了基于USB接口与LabVIEW的数据采集系统.单片机将采集到的信号通过USB接口与串口间的桥接控制器——PL2303传输到PC机,通过LabVIEW进行分析处理.整个系统分为数据采集和数据处理2部分.实验证明,系统能实时精确地显示单片机采集的信号. 相似文献
6.
介绍了通用串行总线标准(USB)接口芯片CH372的性能,描述了USB通信技术在热能信息采集系统中应用的总体结构设计,具体讨论了USB接口芯片的应用电路设计,并对应用系统的部分固件程序、设备驱动程序的编程方法及单片机通过USB接口与PC机进行通信的方法进行了阐述。 相似文献
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研究了一种基于相位差测量的精确测定偏振片透振方向的方法.一束光经过偏振片后变为线偏振光,其偏振方向即为透振方向,然后经过一个四分之一波片和偏振分光棱镜后,偏振分光棱镜的透射光和反射光的相位差与线偏振光偏振方向成一定的关系.通过外差干涉产生拍频光,用相位计采集这两束光的相位差即可确定偏振片的透振方向.在此系统中采用1°的相位计,即可以得到0.5°的测量分辨率.最后,实验证明此系统能够精确测量偏振片的透振方向. 相似文献
8.
基于USB接口的智能温湿度检测仪可实时检测、记录和显示温湿度及露点值,并滚动显示日期和时间,且掉电后数据不会丢失。与上位机(PC机)相连,既能实时绘制温湿度变化曲线,又可将记录的数据进行统计分析处理,生成Excel报表,计算任意测试时段的温湿度最大值、最小值、平均值和方差。该仪器与上位机的通讯采用USB接口,即插即用,增强了检测仪的通用性,使用方便。 相似文献
9.
脉搏检测实验装置的研制 总被引：3，自引：0，他引：3
卢超 《实验室研究与探索》2010,29(9)
研究了现有的脉搏信号处理方法及其测量技术,设计了一种脉搏检测实验装置。该装置由一个通道将时钟、脉搏测量和异常报警及效率定时报警结合起来,实现测定控制;另一个通道将处理后的信号通过USB接口送给上位机实现波形还原、脉搏波检测与控制。 相似文献
10.
为搭建实验系统,将3片线偏振片安装在FW102C型电动可旋转滤光轮上,通过计算机控制滤光轮转动分时采集3个不同偏振角度下的图像,再通过后续计算从而获得所观察场景的线偏振度图像和偏振角图像。针对系统误差校正,首先以马吕斯定律为基础,通过拟合方法完成偏振片偏振角度定标;然后通过手动选择配准点并借助Matlab图像处理工具箱完成视场非一致性校正。实验结果表明,所设计的偏振成像系统能够反映场景中不同目标的偏振特性。该系统结构简单、操作简便,可以满足教学实验的要求。 相似文献
11.
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
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13.
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
14.
《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
15.
YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 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
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献
19.
The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies. 相似文献
20.
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