Three‐dimensional whole‐field measurements of pulsatile glottal jets using synthetic aperture particle image velocimetry.

Abstract

The use of synthetic aperture particle image velocimetry (SAPIV) to measure the three‐dimensional (3‐D) jet velocity field generated by the human vocal folds during speech is described. SAPIV uses an array of cameras to acquire 3D flow velocity data throughout a volume of interest. In the present application, eight high‐speed cameras are synchronized with a volume‐illuminating pulsed laser to image the supraglottal jet exiting from self‐oscillating synthetic vocal fold models. The images from the eight cameras are transformed and reconstructed to generate different image planes within the flow field, to which traditional particle image velocimetry (PIV) techniques are applied to calculate 3‐D velocity vectors throughout the flow field. Two‐dimensional PIV using thin laser sheets has been previously used to study the supraglottal jet, but 3‐D measurements have been typically limited to either (1) quasisteady measurements as the laser sheet traverses the glottal jet volume, or (2) 3‐D measurements over a na...