title: Transducer for mechanical impedance testing over a wide frequency range through active feedback.
abstract: We describe a feedback-controlled active mechanical probe which can achieve a very low mechanical impedance, uniformly over a wide frequency range. The feedback produces a state of quasi-resonance which transforms the probe into a source of force used to excite an unknown load, resulting in a precise measurement of the real and imaginary components of the load impedance at any frequency. The instrument is applied to the determination of the mechanical impedance of a fingertip.
authors.affiliation: CEA LIST, Sensory and Ambient Interfaces Laboratory, Fontenay-Aux-Roses, France. michael.wiertlewski@cea.fr
authors.forename: Michael
authors.initials: M
authors.lastname: Wiertlewski
authors.forename: Vincent
authors.initials: V
authors.lastname: Hayward