Analysis of Linearity and Frequency Response of a Novel Piezoelectric Flextensional Actuator Using a Homodyne Interferometer and the J1-J4 Method. - Luiz Antônio Perezi Marçal; José Vital Ferraz Leão; Gilder Nader; Ricardo Tokio Higuti; Cláudio Kitano; Emílio Carlos Nelli Silva (IEEE Trans. Instrum. Meas., 2007)