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3. Pyroelectric and ferroelectric sensors
Some materials naturally possess a spontaneous polarization that varies with temperature and can be reversed by the application of an electric field. These materials are called pyroelectric, and their properties can be explained by their crystalline structure, which is such that dipoles naturally exist due to the non-coincidence of the centers of gravity of positive and negative charges. Spontaneous polarization P s thus appears, and varies with temperature, as a result of the changes that temperature brings about in the crystalline structure and, in particular, in the size of the crystal lattice. The temperature behavior of the spontaneous polarization is shown on 5 .
Pyroelectric materials can therefore be used to...
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Pyroelectric and ferroelectric sensors
Thermoelectric sensors
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We need to distinguish between the small number of developers of uncooled infrared detection technologies and the large number of manufacturers of systems or cameras based on these detectors. This box gives an overview of the players involved in the development of uncooled detection technologies. These players supply the market with detectors or modules (detector + implementation electronics) for infrared systems.
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To supplement this information with technical and economic data, we refer to market studies such as Maxtech International's "The world market for commercial & dual-use infrared imaging and infrared thermometry equipment" (volume IRW-C) ....
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