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本文简要地叙述相关技术的基本原理,阐述了怎样使用互相关技术辨识范围广泛的电信系统的动态特性、结构和处理系统。文本主要强调互相关流量计,它已发展成为一种能够满意地解决工业和环境测量问题的仪器,从管道中高度污染的液体的流量到火山喷发出的气体的流量均可进行测量。互相关流量计是以测量两个轴向分隔的传感器之间的流量特征信号(如粒子的湍流度和块的组合等)的传输时间为基础的。这个传输时间由互相关仪测量。本文将详细讨论各种不同的子系统的设计,以及用于特殊用途的各种传感技术。由于用于相关仪的大规模集成电路和微处理机成本的下降,互相关流量计已成为一个现实的课题。本文叙述互相关仪的许多不同设计以及它们的特点。
This article briefly describes the basic principles of the related technologies and explains how to use cross-correlation techniques to identify the dynamic characteristics, structures and processing systems of a wide range of telecommunications systems. The text focuses primarily on cross-correlation flowmeters and has evolved into an instrument that satisfactorily addresses industrial and environmental measurement issues, from the flow of highly contaminated fluids in pipelines to the flow of gas emanating from volcanoes. Cross-correlation flowmeters are based on measuring the transmission time of flow characteristic signals (eg turbulence of particles and combinations of blocks, etc.) between two axially-spaced sensors. This transfer time is measured by the cross-correlation meter. This article discusses in detail the design of various subsystems and the various sensing technologies used for specific applications. Due to the cost reduction of LCRs and microprocessors used in correlators, cross-correlation flowmeters have become a real issue. This article describes many different designs of cross-correlation meters and their characteristics.