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Instrumentation Reference Book, 4th Edition by Walt Boyes

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21.6. Measurement Techniques: Radiation Thermometers

21.6.1. Introduction

As mentioned in Section 21.1 , thermal energy may be transferred from one body to another by radiation as well as by conduction. The amount of thermal energy or heat leaving a body by radiation and the wavelength of that radiation are functions of the temperature of the body.
This dependence on temperature of the characteristics of radiation is used as the basis of temperature measurement by radiation thermometers. Radiation thermometers are also known as radiation pyrometers.

21.6.1.1. Blackbody Radiation

An ideal blackbody is one that, at all temperatures, will absorb all radiation falling on it without reflecting any whatever in the direction of incidence. The absorptive ...

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