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Temperature Measurement of Solid Bodies by Contact Method One of the most frequently encountered problems in temperature measurement is measuring the temperature of solid bodies on their surfaces in contact with a surrounding gas or liquid . This may be solved by either contact or non-contact methods. Semi-contact or quasi-contact methods may also be used. Roeser and Mueller (1930) have previously discussed the problem . The non-contact, or pyrometric, methods are described in detail in Chapters 8 to 11 . For a rough estimation of surface temperatures, temperature indicators, described in Section are also used. The problem of measuring the. | 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 16 Temperature Measurement of Solid Bodies by Contact Method Introduction One of the most frequently encountered problems in temperature measurement is measuring the temperature of solid bodies on their surfaces in contact with a surrounding gas or liquid. This may be solved by either contact or non-contact methods. Semi-contact or quasi-contact methods may also be used. Roeser and Mueller 1930 have previously discussed the problem. The non-contact or pyrometric methods are described in detail in Chapters 8 to 11. For a rough estimation of surface temperatures temperature indicators described in Section are also used. The problem of measuring the internal temperatures of solid bodies considered in Section is also similar to surface temperature measurement. Theory of the Contact Method It is assumed that a solid body in contact with a surrounding gaseous medium as shown in Figure remains in a thermal steady-state. A surfacial heat source is placed inside the solid body whose true surface temperature t t is higher than the ambient gas temperature t a. The surface temperature t t is to be measured by a contact sensor which is a bare thermocouple having a flat-cut measuring junction in contact with the surface. Figure a illustrates the original isotherms of the undisturbed thermal field. When the contact sensor is introduced the thermal field is deformed as shown in Figure b . Assume that the heat transfer between the investigated surface and the surrounding gaseous medium takes place through convection and conduction and that the isotherms in the gas are deformed in the vicinity of the sensor. The corresponding temperature distribution in the direction normal to the surface is shown in Figures c and d . While making contact with the investigated surface .

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