Abstract
Vertical movements of the vocal folds during phonation were analyzed using a laser doppler vibrometer (LDV) . Four excised canine larynges were used for the study. A laser beam reflected on the upper surface of the vocal fold was fed into a LDV to measure verticalvelocity and displacement of the mucosal wave. Signals from the LDV during vibration were recorded under two conditions : with and without vocal fold elongation. Vertical velocity and displacement increased as mean airflow rate was increased. Displacement decreased when the vocal fold was elongated. On the other hand, the vertical velocity did not always increase when the vocal fold was elongated.
