摘要
设计了一套便携式电阻噪声实验教学系统。对电阻的1/f噪声和热噪声进行了理论分析,提出了利用惠斯通电桥构成电阻噪声测量电路,并论证了电桥测量电阻噪声的可行性。介绍了系统的组成框架,电路输出的电阻噪声经过低噪声差动放大器放大,再由USB数据采集卡采集并传输给上位机;上位机采用Labview软件实现对噪声数据的读取和分析,对数据进行FFT变换和功率谱计算,从而观察到了电阻噪声的特性。为了观察和记录实验过程,利用Labview提供的IMAQ Vision视觉模块,结合USB摄像头实现了视频显示和录制。经测试,该系统能快速检测出电阻噪声信号,并观测到电阻1/f噪声和热噪声的特性,可满足实验教学要求。
In order to easily observe the resistor noise during teaching and experimental process,a portable resistor noise observation system is designed in this paper.The theory of 1/f noise and thermal noise is anlyzed,a circuit constituted by Wheatstone bridge is proposed to measure resistor noise.A brief introduction to the framework of the system is given：the signal outputted from circuit is amplified by a low-noise differential amplifier,then is collected by USB data acquisition card and transmited to PC; Labview software is used to read the sampling data,analyze the characteristics of the thermal noise and 1/f noise through the FFT transform and power spectrum computing,and observe the characteristics of noise.In order to observe and record the experiment process,we use Labview IMAQ Vision visual module and USB camera to achieve the video display and recording.Tests show that the system can quickly detect resistor noise and reflect noise characteristics and meets the experimental and teaching requirements.
出处
《实验室研究与探索》
CAS
北大核心
2014年第1期89-93,109,共6页
Research and Exploration In Laboratory
基金
上海交通大学985三期建设项目
