摘要
脉冲信号具有传输距离远、抗干扰能力强的优点。所以,许多模拟量传感器设计了脉冲形式的输出信号,输出脉冲的频率随模拟量的大小而变化。本文讨论了这种反应模拟量大小的脉冲信号的计算机测量方法。文中提出了两种测量方法,一是定时计数法,在设定时间内测量输入脉冲的个数;另一个是周期计时法,捕捉输入脉冲的一个周期,测量周期的时间。作者通过波形分析给出了这两种测量方法的原理,通过数学描述详细分析了这两种方法的测量精度。分别列出了影响两种方法的测量精度的各种因素,给出了改善测量精度的方向。其中一个测量方法在煤矿井下环境参数的测量系统中得到了很好的应用。
The pulse signal has a lot of advantages, many analog sensors are designed to output in the form of pulse signals, the value of the frequency of the pulse signals varies with the value of the analog signals. This article discussed two methods to measure the frequency of the pulse signal by using computer. One method is called the counting numbers in a given time, which means to count the numbers of the pulse signals in a setting time ; another is called the measuring time value in a cycle, which means to catch a circle of pulse signal and measures the time value of the circle. The paper analyzed the principles of these two kinds of measuring methods through the analysis of the signal wave, and gives the measurement precision of these two methods in detail through the mathematics description, and listed various kinds of factors that influence the precision of the two measurements respectively, and suggested some directions to improve the precisions. At last it gave that one of the measuring methods has been applied very well in the environmental parameter measurement systems under the coal mining well.
出处
《电子测量与仪器学报》
CSCD
2006年第2期86-88,105,共4页
Journal of Electronic Measurement and Instrumentation
关键词
脉冲频率
模拟量
煤矿环境
测量精度
pulse frequency, analogue value, mineral environment, measurement precision.
