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11:11
Construction and Characterization of a Novel Vocal Fold Bioreactor
Published on: August 1, 2014
Vocal fold vibration measurements using laser Doppler vibrometry
Alfred Chan1, Luc Mongeau, Karen Kost
1Department of Mechanical Engineering, McGill University, Montreal, Quebec H3A 2K6, Canada. alfred.chan@mail.mcgill.ca
The Journal of the Acoustical Society of America
|March 8, 2013
Summary
This study measured human vocal fold vibration velocity using laser Doppler vibrometry (LDV). Significant vibration energy was found up to 3 kHz, with distinct waveforms identified.
Area of Science:
- Biomechanics
- Acoustic analysis
- Vocal fold dynamics
Background:
- Understanding vocal fold vibration is crucial for voice production.
- Previous methods lacked precision in measuring surface velocity.
- Laser Doppler Vibrometry (LDV) offers a non-contact method for precise measurements.
Purpose of the Study:
- To measure the superior surface velocity of human vocal folds during phonation.
- To characterize vocal fold vibrational waveforms and energy distribution.
- To investigate relationships between velocity, displacement, frequency, and sound pressure level.
Main Methods:
- Developed a custom endoscopic laser beam deflection unit for in vivo measurements.
- Simultaneously collected LDV velocity, videolaryngoscopy, electroglottograph, and sound level meter data.
- Captured velocity in the inferior-superior direction, synchronous with other physiological data.
Main Results:
- Vocal fold vibration energy was significant up to 3 kHz.
- Identified three characteristic vibrational waveforms potentially indicating mucosal wave bifurcations.
- No direct relationship found between velocity amplitude and phonation frequency or sound pressure level.
- A correlation was observed between peak-to-peak displacement amplitude and phonation frequency.
- A sparse velocity amplitude map of the vocal fold surface was generated.
Conclusions:
- LDV provides valuable data on vocal fold surface dynamics.
- Distinct vibrational modes may exist in the mucosal wave.
- Further research can correlate these findings with voice disorders and treatment outcomes.
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