Feedforward correction of nonlinearities in piezoelectric scanner constructions and its experimental verification.
Piezoelectrical actuators widely used in scanning devices for highly resolved displacement generation exhibit a number of known nonlinear effects as hysteresis and creep. This article describes an attempt to minimize those nonlinearities by recognizing the relation between scan range and voltage magnitude in a scanner specific function. In addition, by utilizing a strain gauge sensor system, a forward displacement correction is realized. The mathematical procedure behind the hysteresis correction is described in detail. The dependence of the higher order correction factors on parameters such as scan speed, scan range, or center position is studied carefully to extract their influence on the result. Finally, integral nonlinearities of about 1% are proven in experiments with an atomic force microscope.
Graffel
B
B
Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany. benjamin.graffel@s1999.tu-chemnitz.de
Müller
F
F
Müller
A-D
AD
Hietschold
M
M
D000465:Algorithms; D016477:Artifacts; D004581:Electronics / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005246:Feedback; D009038:Motion; D017711:Nonlinear Dynamics; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013048:Specimen Handling / Q000295:instrumentation* / Q000379:methods; D014159:Transducers