电子温度测量Electrical Temperature Measurement

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M. Nau, "Electrical Temperature Measurement" 电子温度测量
2002 | pages: 163 | ISBN: 393574207X | PDF | 4,3 mb

For decades, temperature has been one of themost important process variables in the automation, consumer goods andproduction industries. Electrical measurement of temperature, by usingresistance thermometers and thermocouples, is in fact more than 100 years old,but the development of sensors and thermometers is by no means over. The continuousoptimization of processes leads to ever higher demands on the thermometers, tomeasure temperature faster, more accurately, and with better repeatability overa longer time.Since there is, regrettably, no single thermometer that iscapable of handling all possible measurement tasks with sufficient accuracy, itis vitally important, especially for the user, to be first familiar with thefundamentals of electrical temperature measurement and then to understand thecharacteristics and sources of error involved. A precision thermometer byitself is no guarantee that the temperature will be properly measured. Thetemperature that is indicated is only the temperature of the sensor. The usermust take steps to ensure that the temperature of the sensor is indeed the sameas that of the medium being measured.This book has been a favorite guide forinterested users for many years. This version has been revised and updated totake account of altered standards and new developments. In particular, the newchapter "Measurement uncertainty" presents the basic concepts of theinternationally recognized ISO guideline "Guide to the expression ofuncertainty in measurement" (abbreviated to GUM) and illustrates methodsof determining the measurement uncertainty of a temperature measurement systemand the factors that affect it.

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