Heating and cooling deviceThe measuring system consists of various heating and cooling devices (see Appendix 3). These facilities include plates with square section (300 mm x 300 mm), rather than a circular contrary to the preliminary draft budget in the initial application. This design was chosen because of the more favorable sample preparation and is through the exchange of experience with other scientists confirmed §. To use the advantage of circular plates with a homogeneous temperature field in the radial direction (no corners effect, see continuation application), the Middle plate ("Metering Plate") is circular designed and manufactured. She is responsible for the generation of the one-dimensional heat flow through the sample. The preparatory studies for the production ofInhomogeneities showed heating plate, which consists of two thin metal plates and a heating element embedded in between, in the distribution of the solder as well as in the field of temperature. This is due to the differences of thermo mechanical stresses between the electric on the one hand and on the other hand, the two plates. As improved variant, the heating unit consists of only a plate into a Groove is milled, which, in turn, can completely absorb the heating cable. The resulting gaps between the heating element and metal plate were filled by solder. The plates were finally honed to the plane parallelism and flatnessSurfaces to ensure. This design represents an optimal solution for the application in the measuring equipment.
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