Patent ID: 8886491
Filing Date: 2014-11-11
Classification: G01L

Abstract:
1. A method for automatic calibration of a piezoelectric force transducer wherein the force transducer contains at least a pair of piezoelectric elements disposed to measure forces in a common axial direction, comprising: applying a first input signal having a voltage component to a first piezoelectric element to generate a first force applied to said second piezoelectric element in said pair, and receiving a first output signal having an associated voltage component and an associated phase from said second piezoelectric element in said pair, said first output signal representative of a response by said second piezoelectric element to said first generated force; applying a second input signal to said second piezoelectric element in said pair to generate a second force applied to said first piezoelectric element in said pair, and receiving a second output signal having a second associated voltage component and a second associated phase from said first piezoelectric element in said pair, said second output signal representative of a response by said first piezoelectric element said second generated force; wherein said first and second output signals define a set of output signals; and evaluating said set of output signals to establish compensation values for calibrating subsequent output signals from said first and second piezoelectric elements.