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Temperature Measurement of Moving Bodies The method of measuring the temperature of moving bodies depends upon the character of the movement. For instance, in the flight of rockets, meteorological probes or satellites the only possible way is by wireless signal transmission. Another group of techniques, covering the temperature measurement of bodies in oscillatory or rotational movement will be discussed in detail in this chapter. As the simplest method of temperature measurement of rotating bodies uses pyrometric techniques this possibility should be the starting point ofall analytical considerations | 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 19 Temperature Measurement of Moving Bodies Introduction The method of measuring the temperature of moving bodies depends upon the character of the movement. For instance in the flight of rockets meteorological probes or satellites the only possible way is by wireless signal transmission. Another group of techniques covering the temperature measurement of bodies in oscillatory or rotational movement will be discussed in detail in this chapter. As the simplest method of temperature measurement of rotating bodies uses pyrometric techniques this possibility should be the starting point of all analytical considerations. Pyrometric methods irrespective of all the limitations resulting from the shape and state of the investigated surfaces are best applied to surfaces which are clearly visible from outside with no obstruction in the line of sight of the pyrometer. Measuring the temperature at any particular point of a rotating body which is not visible in this way requires the fastening of a temperature sensor to the moving body. Its output signal is then transmitted to a stationary external measuring instrument. The majority of problems to be discussed in this chapter concern the temperature measurement of machine parts motors and other moving objects in a range from 20 to several hundred degrees Celsius. In this temperature range temperature indicators already described in Section are also very useful. Pyrometric Contactless Methods Pyrometric measurement principles are described in detail in Chapters 9 and 10. In the temperature range mentioned above low-temperature total radiation pyrometers and spectral and band photoelectric pyrometers may be used. It is also advisable to use two-wavelength or multi-wavelength pyrometers especially for metallic surfaces. One of the main .

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