By Leibniz Gottfried Wilhelm
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Extra info for A Unitary Principle of Optics, Catoptrics, and Dioptrics
A discussion of solutions to this type of problem is included in Chapter 3. 3 Transmitting medium The transmission characteristics of the medium in the measurement path between the target and the instrument need to be considered in making noncontact thermal measurements. No loss of energy is encountered when measuring through a vacuum. Furthermore, for short path lengths (a few feet, for example), most gases, including the atmosphere, absorb very little energy and can be ignored (except where measurements of precision temperature values are required).
The newest and perhaps most versatile of the detectors shown is the QWIP array. QWIP detectors are made from gallium arsenide (GaAs) material. These detectors are narrow-band, high-speed, high-sensitivity detectors that can be designed to operate in selected narrow bands from the MWIR (2–5 µm) to the LWIR (8–14 µm). The versatility of this detector, as well as others, will be illustrated in the applications chapters in Part II of this text. 5 Pyroelectric vidicon thermal imagers These instruments have also been superceded by instruments using two-dimensional IR focal plane staring arrays, although there are some pyrovidicon imagers still in use.
1, located at the end of this chapter, is a conversion table to allow the rapid conversion of temperature between Fahrenheit and Celsius values. The table includes instructions for its use. 3 Three modes of heat transfer There are three modes of heat transfer: conduction, convection, and radiation. All heat transfer processes occur by one or more of these three modes. Infrared thermography is based on the measurement of radiative heat flow and is therefore most closely related to the radiation mode of heat transfer.