TAILIEUCHUNG - Đo nhiệt độ P10

Practical Applications of Pyrometers When describing different types of pyrometers in Chapters 9 and 10 it was assumed that they operate in ideal conditions . Pyrometer readings, which are measurements of the true target temperature, Tt , are strongly influenced by real, practical, industrial operating conditions as shown in a simplified way in Figure 11 .1 . These measurements, which must account for target emissivity, E (Tt) or E,L (T), in the environment of the surrounding walls of temperature, Tom with emissivity, cw(TW), or, sxw(TW ), are taken in the presence of polluted atmosphere of temperature, Ta , having the equivalent. | 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 11 Practical Applications of Pyrometers Introduction When describing different types of pyrometers in Chapters 9 and 10 it was assumed that they operate in ideal conditions. Pyrometer readings which are measurements of the true target temperature Tt are strongly influenced by real practical industrial operating conditions as shown in a simplified way in Figure . These measurements which must account for target emissivity E Tt or E Tt in the environment of the surrounding walls of temperature Tw with emissivity i Tw or e IT are taken in the presence of polluted atmosphere of temperature Ta having the equivalent emissivity a Ta or a 7a and an absorption coefficient aa Ta . Referring to Figure the pyrometer readings depend on following factors radiation emitted by the target whose temperature is to be measured - 1 influence of target emissivity radiation emitted by the body and reflected from surrounding walls - 2 influence of surrounding walls radiation emitted by the walls - 3 influence of surrounding walls radiation absorption by the atmosphere radiation absorption by the sighting window proper emission by the polluted atmosphere presence of solid bodies B in the sighting field of the pyrometer influence of solid obstacles. The pyrometer readings are also influenced by temporarily covering of the target or its movement dispersed radiation from outside of the viewing cone of the pyrometer. 210 PRACTICAL APPLICATIONS OF PYROMETERS Figure Pyrometric temperature measurement in real operating conditions In practice the main components of the total measurement errors are errors ATE depending on the emissivity of the target to be measured errors ATS depending on the influence of surrounding walls errors ATa due to absorption or proper emission by gaseous media errors ATt of the

TỪ KHÓA LIÊN QUAN
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.