Transcription of Temperature Measurement Theory and Practical Techniques
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Temperature Measurement Theory and Practical Techniques
AN-892 APPLICATION NOTE One Technology Way P. O . Box 9106 Norwood, MA 02062-9106, Te l : Fax: Temperature Measurement Theory and Practical Techniques By Donal McNamara Rev. 0 | Page 1 of 8 WARM AIRRISESCOOLER AIR DROPSAND REPLACES THEWARMER AIRHEATER06506-002 HEAT TRANSFER Theory The transfer of heat is normally from a high Temperature object to a lower Temperature object. Heat transfer from a cold region to a hot region can be done by forcing the system (refrigerators, for example) to perform the energy transfer. Heat transfer is accomplished by three basic methods. Conduction Convection Radiation Figure 2. Convection Conduction Radiation Conduction is the most common means of heat transfer in a solid. On a microscopic scale, conduction occurs as hot, rapidly moving or vibrating atoms and molecules interacting with neighboring atoms and molecules, transferring some of their energy (heat) to these neighboring atoms. Radiation is the only form of heat transfer that can occur in the absence of any form of medium and as such, is the only means of heat transfer through a vacuum.
AN-892 Rev. 0 | Page 3 of 8 A H T 06506-004 Fact: Conduction is the Most Prevalent Heat Transfer Method in PCBs If one end of a PCB is at a higher temperature, energy is
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