3D synthetic aperture PIV measurements from articial vibrating vocal folds
Year: 2011
Type: preprint
Abstract: During speech, air from the lungs is forced past the vocal foldswhich vibrate, producing sound. A pulsatile jet of air is formed down-stream of the vibrating folds which interacts with the various structuresin the airway. Currently, it is postulated that the way this jet inter-acts with the downstream structures in the airway directly a ects thequality of human speech. In order to better understand this jet, itis desirable to visualize the jet in three dimensions. We present theresults of a method that reconstructs the three dimensional velocity eld using Synthetic aperture PIV (SAPIV) [1].SAPIV uses an array of high-speed cameras to arti cially createa single camera with a variable focal length. This is accomplishedby overlapping the images from the array to create a \focal stack.As the images are increasingly overlapped, more distant image planescome into focus. 3D PIV is then performed on the \refocused focalstack to reconstruct the ow eld in three dimensions. SAPIV has theability to track very high particle densities.Arti cial self oscillating vocal folds made of silicone were drivenwith compressed air infused with small glass microspheres. As thevocal folds vibrated, the entrained microspheres were illuminated by alaser volume. Eight high-speed cameras were used to capture imagesof the particles for SAPIV postprocessing.SAPIV was able to successfully perform the rst whole- eld re-construction of the pulsatile jet emerging from the vocal folds. Theability to visualize this jet will help researchers and clinicians better
Source: arXiv (Cornell University)
Language: English
Subfield: Computational Mechanics
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1621985809