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南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

卷:

05卷

期数:

2005年03期

页码:

012-15

栏目:

出版日期:

2005-09-30

文章信息/Info

Title:

On the Noise Silencing in the Channel of Electronic Measuring Apparatus

作者:

朱延海

江苏警官学院公安科技系 江苏南京210012

Author(s):

ZHU Yanhai

Department of Forensic Science, Jiangsu Police Officer College, Jiangsu Nanjing 210012, China

关键词:

测量仪器;  随机过程;  噪声;  信道

Keywords:

m easuring apparatus;  stochastic process;  no ise;  channe l

分类号:

TM930

摘要:

在现代电子测量技术中,通过传感器可以将各种物理量转换为电信号进行分析处理.电信号进入电子测量仪器信道进行放大、处理,这一过程不可避免地会受到各种噪声的干扰,这些噪声叠加在有用信号上,必然会降低测量结果的准确度和可信度.在这些噪声中,加性噪声具有普遍性和不可避免性,加性噪声的3种主要存在形式:热噪声、散弹噪声和宇宙噪声,这3种噪声都是高斯噪声,在相当宽的频率范围内具有平坦的功率谱密度,据此可以利用噪声自身在信道中进行消除,在信号放大通路中,利用回程期间存储噪声信号,正程时进行噪声消除,在工程实际电路的实现中,电路的形式和元器件的选择对性能的影响,要进行调试,对其中应注意的问题提出了解决方法,最后给出了实际应用中的结论性结果.

Abstract:

In them odern techno logy o f electronm easurem en t, all kinds of phy sica l quan tities can be ana lyzed through transduce r by converting them into s igna ls. The process o f amp lify ing and trea ting signa ls in the channe l o f e lec tron m easurem ent w ill be unavo idab ly d isturbed by various no ises wh ich, once added up on usefu l signals, are certa in to lowe r the accuracy and va lidity of the resu lts m easured. Among these no ises, a popular and inevitab le no ise, add itive no ise, is analyzed in the paper through its three form s: therm a l no ise, sho t no ise and cosm ic no ise. Based on this, the paper then puts forw ard the theory of no ise silenc ing in the channe l and proves its feas ibility and rea liza tion in the real e lectric c ircuits. By g iv ing some so lutions to problem s, the pape r ends w ith a conclus ive result in the rea l practice.

备注/Memo

备注/Memo:

作者简介: 朱延海( 1970-) , 讲师, 主要从事电子与计算机应用等方面的教学与研究. E-m ail: zhuyanhai@ jpi.gov. cn

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更新日期/Last Update: 2013-04-29