FORCE-MEASURING DEVICE Russian patent published in 1999 - IPC

FIELD: measurement of mechanical efforts in various branches of industry. SUBSTANCE: two piezoelements connected acoustically with the aid of coupling element are positioned in parallel and are fitted with four external and two internal covers. Each of two generators of electric oscillations is connected to external cover of only one piezoelement. Coupling elements have identical termination pads for contact with piezoelements. Force-transfer elements are manufactured in the form of cones with same contact area with piezoelements. Each external cover of piezoelement is connected to one of two inputs of detector of synchronous mode whose output is linked to control unit. One output of control unit is connected to input controlling excitation amplitude of second generator of electric oscillations. Inputs of count inhibition and clearing of unit of counters are coupled to two outputs of control unit. Third input of unit of counters is connected to first generator. Unit of registers is connected with input permitting recording to third output of control unit and with other inputs - to outputs of unit of counters and is connected with output to input measurement instrument. EFFECT: increased measurement precision due to reduction of dynamic error caused by relaxation mechanism of change of area of acoustic contact of piezoelements. 2 dwg