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UID:20260523T080611EDT-0958lWhG8v@132.216.98.100
DTSTAMP:20260523T120611Z
DESCRIPTION:Abstract\n\nThis Ph.D. thesis focuses on micromachined ultrason
 ic transducers (MUTs) for sensing and actuation\, emphasizing capacitive m
 icromachined-based devices. The research encompasses developing and charac
 terizing innovative MEMS-based solutions\, addressing various challenges i
 n the field.\n\nOne significant contribution of this work is the developme
 nt of a micro-viscometer that uses a capacitive micromachined ultrasonic t
 ransducer (CMUT) and a low-power transceiver ASIC. The system can monitor 
 engine oil viscosity\, detect technical defects early on\, and provide ins
 ights into the engine's condition\, leading to optimally timed oil change 
 intervals. MUTs in this application offer a low-cost and small-size soluti
 on for engine oil monitoring.\n\nAnother significant contribution is the d
 evelopment of a repulsive actuation-based MEMS varactor that exhibits an u
 ltra-linear capacitance-to-voltage response. This approach achieves high l
 inearity in the capacitance-versus-voltage response\, without any abrupt c
 apacitance change or pull-in voltage limitation. The potential application
 s of this development include VCOs\, PLL circuits\, and various electrical
  circuits to achieve low phase noise and large capacitance tuning ratios.
 \n\nLastly\, the research investigates a novel approach to enhance ultraso
 und transmission using capacitive micromachined ultrasonic transducers (CM
 UTs). The CMUT design proposed achieves increased cavity height and out-of
 -plane displacement through electrostatic repulsion. Simulation results de
 monstrate a notable improvement in the range of motion and enhanced sound 
 pressure transmission. Experimental tests validate the effectiveness of th
 e proposed approach\, showcasing substantial improvements in ultrasound tr
 ansmission over a wide frequency band. This research opens doors for appli
 cations such as ranging\, gesture recognition\, and non-destructive testin
 g.\n\nOverall\, this Ph.D. thesis advances micromachined ultrasonic transd
 ucers\, particularly capacitive micromachined-based devices\, for sensing 
 and actuation. The research provides valuable insights that can further im
 prove MUT design and implementation\, resulting in more efficient\, cost-e
 ffective\, and sustainable solutions.\n
DTSTART:20231208T150000Z
DTEND:20231208T170000Z
LOCATION:Room 603\, McConnell Engineering Building\, CA\, QC\, Montreal\, H
 3A 0E9\, 3480 rue University
SUMMARY:PhD defence of  Roufaida Bensalem – Innovative Designs and Implemen
 tations of Capacitive Micromachined-Based Solutions for Sensing and Actuat
 ion
URL:/ece/channels/event/phd-defence-roufaida-bensalem-
 innovative-designs-and-implementations-capacitive-micromachined-based-3533
 17
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