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| Resonance Suppression on Nanoscale Viscoelasticity Measurement |
| DU Yi-hao1,XIE Ping1,ZHANG Lei1,ZOU Qing-ze2 |
1. School of Electrical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China;
2. Department of Mechanical and Aerospace Engineering, the State University of New Jersey, New Brunswick, NJ 08854, USA |
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Abstract Aiming at the cantilever resonance leads to large measurement data errors in indentation measuring soft material, a method to suppress the cantilever resonance on the broadband viscoelasticity measurement is proposed. A notch filter type prefilter based on z-axis dynamics is designed, and used to filter the input drive voltage; An adaptive filter based on the least mean square (LMS) is designed, and referring to the Hertz contact model to filter the complex compliance of soft materials, furtherly eliminate the residual cantilever resonance effects in input link and output link. The validity of the cantilever resonance suppression method is verified by implementing the polydimethylsiloxane (PDMS) sample viscoelasticity measurement.
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2015, Vol. 36 
