一、问题的提出在生产过程中所用的常规工业自动化仪表,是为了检测、控制生产过程的参数。长期以来都是采用静态测量的办法(即忽略了在测量过程中时间因素对被测参数的影响)而达到测量的目的,确实也能满足一般生产对测量的要求。这种把随时都在变化的被测量近似地看成不变量来进行测量,当被测量变化比较缓慢,或对测量精度要求不高的情况下,是能够满足生产需要的。这种测量,从测量原理来分析,也都是利用简单的相关分析,甚至把被测量参 First, the question put forward in the production process used in conventional industrial automation instruments, is to detect and control the parameters of the production process. For a long time, the method of static measurement (ie ignoring the influence of the time factor on the measured parameter during the measurement process) can achieve the purpose of measurement and can indeed meet the measurement requirements of general production. This kind of measurement that changes at any time is regarded as invariable to measure approximately, when the measured change is relatively slow, or the measurement accuracy is not high, it is able to meet production needs. This measurement, from the measurement principle to analyze, are also using a simple correlation analysis, and even the measured parameters