Avl List Gmbh

Piezocryst Advanced Sensorics Gmbh

Ferdinand Krispel

Peter W Krempl

Alexander Schricker

Alexander Friedl

Herbert Thanner

Michael Hirschler

Dietmar Kröger

Wolfgang Michelitsch

Wolfgang Walln&ouml;fer

A piezoelectric sensor, preferably a pressure sensor, comprising at least two piezoelectric measuring elements placed in a housing, which are clamped between a membrane on the pressured side of the housing and a pick-up electrode electrically insulated against the housing. The piezoelectric measuring elements are fixedly attached to the pick-up electrode by thermo-compression or soldering and together with said pick-up electrode form a compact measuring element stack, which will significantly simplify assembly of the piezoelectric sensor.

Piezoelectric sensor

To obtain large, high-quality crystals of a metal orthophosphate, in particular GaPO or AlPO , from a nutrient solution with the use of seeds, a seed crystal is used having at least two rod- or wafer-shaped legs which form an angle with each other and define a main growth region, and which are positioned eccentrically in the single crystal grown. Contagious faces of two seed legs, which have been chosen for crystal growing, enclose an angle <180&deg;. In this way the yield of the high-quality crystal region will be increased.

Method for the growing of single crystals

Growing community of inventors

Wundschuh, Austria

Ferdinand Krispel