FOROB II

BAVARIAN JOINT RESEARCH PROGRAM FOR SURFACE TECHNOLOGY

II.5 Doped layer systems: optical sensoring of electrical field strength and temperature

Field of work:

Optical sensoring of field strength and temperature is to be conducted on layer systems by microscopic sounds (eg F-centers, metal ions, dye molecules). Either the layers are deposited in addition or they already accomplish a certain function (eg insulation, heat diversion, protection against wear or corrosion). Thereby polymers, silicons or hard material layers (eg a-Al2O3, AlN, CVD diamond and diamond-like layers) shall be used particularly on the surface rep. in the inside of metallised ceramic substarte discs of power electronics. For measurement of electrical field strength and temperature spectral lines as well as spectral holes which are burnt by laser into the absorption spectrums are used. For optical temperature measurement fluorescence thermograph methods with memory functions are at disposal, too, which enable the hindsight determination of the temperature present during the thermal burdening. These methods are based in particular on thermolysis of dye-doper oxides rep. on dissociation of dye aggregates.