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The Piezo Task adds to the standard Hysteresis Task automatic measurement of the output of a displacement meter to detect the motion at the surface of a Piezoelectric sample as it is stimulated by tester. The displacement meter output is connected to the SENSOR input at the rear of the Precision tester . Radiant has combined the original PiezoTask with specialized math filters to create this more advanced acquisition task that will accurately measure extremely small displacement butterfly loops. When the displacements being measured are so small, less than 300 nanometers, ambient environmental effects from vibration to air currents to thermal expansion of test fixtures will distort the results. Averaging alone will not do. Averaging alone simply reduces the effects of the environmental distortions on the final measurement. Instead, each loop must be zero'd and de-trended individually before averaging and smoothing. The Advanced Piezo Task performs these actions as it collects the displacement data. Since the Precision Testers will accept displacement data from any displacement sensor, including interferometers and AFMs, Advanced Piezo makes it possible to directly measure the piston motion of thin ferroelectric films. Bulk Ceramics & MEM's can also be measured with the same software.
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