Thermal masking for electronics. Free Technical Library News

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Thermal masking for electronics

11.04.2012

A group of French scientists have proposed a new approach to creating invisibility in the infrared range. Thermal cloaking works on the same principles as optical cloaking, and in the future will allow the development of new methods of heat removal in electronics, opening up new possibilities in the design of spacecraft and military equipment.

The latest advances in optical invisibility are based on metamaterials that bend light and make objects invisible. Scientists from Aix-Marseille University and the CRNS National Center have proven that the same approach can be applied to thermal camouflage. Although the new technology uses the basic theories applied to optical invisibility, it has one key difference. So far, cloaking research has only focused on wave trajectory manipulation. These include electromagnetic (light), sound, seismic and hydrodynamic waves. In turn, French scientists use thermal diffusion for thermal masking (transfer of components of gas mixtures or solutions under the influence of a temperature gradient).

Heat is not a wave, and it cannot travel long distances. In a two-dimensional model, the scientists directed heat flows from the hot zone of the object to the cool zone through the region between isotherms (concentric diffusion rings). The researchers then changed the geometry of the isotherms and forced the heat flow to bypass the circular area to the right of the heat source. Thus, it is possible to protect the object from heating or vice versa to concentrate a large amount of heat in a small volume. The ability to protect a specific area from heat is very attractive to electronics manufacturers. With the new technology, it is possible to prevent overheating of nanoelectronic and microelectronic devices, which are very difficult to cool with conventional methods.

Currently, French scientists are working on the creation of prototypes of thermal masking for microelectronics, the first samples will be ready within the next few months.

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