Publications in Scientific Journals:
M. Kucera, F. Hofbauer, E Wistrela, T. Manzaneque, V Ruiz-Díez, J.L. Sànchez-Rojas, A. Bittner, U. Schmid:
"Lock‑in amplifier powered analogue Q‑control circuit for self‑actuated self‑sensing piezoelectric MEMS resonators";
Microsystem Technologies - Micro- and Nanosystems - Information Storage and Processing Systems,
20
(2014),
615
- 625.
English abstract:
This paper presents a novel analogue Q-control circuit. a self-actuated and self-sensing piezoelectric microstructure in combination with a lock-in amplifier is used to provide a feedback signal with a substantially reduced noise level. This Dc-value being proportional to the piezoelectric current is multiplied with a carrier sinusoidal signal on a custom-designed analogue printed circuit board applying an analogue amplifier Ic. With this generated analogue feedback signal a complete analogue Q-control circuit is realized enabling faster response and as a consequence measurement cycles are less time consuming. Using this proposed Q-control technique, the Q-factor is increased from 397 to about 8,537 in air without pushing the feedback loop circuitry to stability limits. We believe that these promising results will stimulate further activities for a reliable on-line monitoring of even highly viscous liquids in the near future.
German abstract:
This paper presents a novel analogue Q-control circuit. a self-actuated and self-sensing piezoelectric microstructure in combination with a lock-in amplifier is used to provide a feedback signal with a substantially reduced noise level. This Dc-value being proportional to the piezoelectric current is multiplied with a carrier sinusoidal signal on a custom-designed analogue printed circuit board applying an analogue amplifier Ic. With this generated analogue feedback signal a complete analogue Q-control circuit is realized enabling faster response and as a consequence measurement cycles are less time consuming. Using this proposed Q-control technique, the Q-factor is increased from 397 to about 8,537 in air without pushing the feedback loop circuitry to stability limits. We believe that these promising results will stimulate further activities for a reliable on-line monitoring of even highly viscous liquids in the near future.
"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1007/s00542-013-1997-3
Related Projects:
Project Head Ulrich Schmid:
Mikrosystemtechnik Projektkonto Schmid
Created from the Publication Database of the Vienna University of Technology.