TAILIEUCHUNG - Đo nhiệt độ P7

Pyrometers Classification and Radiation Laws Classification of Pyrometers The simplest and oldest non-contact way of estimating the temperature of a radiating body is by observing its colour. Table 8 .1 summarises the relationship between temperature and colour . Using this method, experienced practitioners can estimate temperatures over about 700 °C, with a precision sufficient for simpler heat-treatment processes . This is shown in a witty way in Figure , which is taken from Forsythe's paper (Forsythe, 1941) . It was presented at the historical Symposium on Temperature in November 1939, a symposium that was a milestone in further development of thermometry. | Temperature Measurement Second Edition L. Michalski K. Eckersdorf J. Kucharski J. McGhee Copyright 2001 John Wiley Sons Ltd ISBNs 0-471-86779-9 Hardback 0-470-84613-5 Electronic 8 Pyrometers Classification and Radiation Laws Classification of Pyrometers The simplest and oldest non-contact way of estimating the temperature of a radiating body is by observing its colour. Table summarises the relationship between temperature and colour. Using this method experienced practitioners can estimate temperatures over about 700 C with a precision sufficient for simpler heat-treatment processes. This is shown in a witty way in Figure which is taken from Forsythe s paper Forsythe 1941 . It was presented at the historical Symposium on Temperature in November 1939 a symposium that was a milestone in further development of thermometry. Table Temperature correlation with colours of radiating bodies Temperature C Colour Temperature C Colour 550-580 Black purple 830-880 Dark orange 580-650 Brown purple 880-1050 Orange 650-750 Purple 1050-1150 Yellow orange 750-780 Dark carmine 1150-1250 Yellow 780-800 Carmine 1250-1320 White yellow 800-830 Orange carmine Figure First pyrometric temperature measurement 152 PYROMETERS CLASSIFICATION AND RADIATION LAWS Pyrometers also known as infrared thermometers or radiation thermometers are noncontact thermometers which measure the temperature of a body based upon its emitted thermal radiation thus extending the ability of the human eye to sense hotness. No disturbance of the existing temperature field occurs in this non-contact method. In pyrometry the most important radiation wavelengths which are situated between from to 20 pm belong to the visible and infrared IR radiation hands. In addition to the methods outlined in Chapter 1 it is also possible to classify pyrometers according to their spectral response and operating method as shown in Figure and described in more detail later. Manually operated or hand operated .

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