Abstract
A methodology to obtain phase locked planar unsteady flow of the near field of supraglottal flow in an excised larynx using particle image velocimetry (PIV) is presented. Different steps involved in obtaining 2D flow field at different instances of the EGG or microphone signal and the structural motion of the vocal fold are discussed. Real time signal processing of the sensor signal coupled with the synchronization of the PIV flow field and high speed imaging of the vocal fold is used to evaluate the relationship between acoustics‐structure and flow. Issues that can affect the accuracy of the flow field measurements and the reconstruction of the flow patterns at different instances during the EGG/microphone cycle were identified and suitable measures taken to resolve them are discussed. Some of these include simulating a symmetric vocal fold motion, maintaining a constant phonation frequency over the entire experimental run, preventing any spurious vectors that could arise due to reflection from the moist tissue surface or poor spatial or temporal resolution. Examples are also shown where the effect of these factors impact both the raw seeded image and correlation PIV algorithm used to extract the flow field vectors.
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