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The commercially available Siemens pressure sensor KPY 12 in silicon planar technology measures differential pressures up to 2 bar in the temperature range from 243 K to 398 K. However, at temperatures down to 4 K the specified linearity is also preserved, and the sensitivity increases by about 100 %. The sensor has been successfully employed at low temperatures in a test rig rotating at 3000 rpm

Hands, arms and legs immersed in a water bath can be imaged by the complementary methods of re flection and transmission mode. The two system con figurations and their related image processing are described.The reflection system collects B-scans from many directions and generates geometrical cross sections as well as spatial distributions of physical parameters in the insonified tissue by applying computer tomographic principles. Regions of interest can be investigated interactively with reduced resolution. Planes perpendicular to the cross section are imaged by the transmission sy stem.

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