Department of Mechanical Engineering, McGill University, Montreal, Quebec H3A 2K6, Canada.
J Acoust Soc Am. 2013 Mar;133(3):1667-76. doi: 10.1121/1.4789937.
The objective of this study was to measure the velocity of the superior surface of human vocal folds during phonation using laser Doppler vibrometry (LDV). A custom-made endoscopic laser beam deflection unit was designed and fabricated. An in vivo clinical experimental procedure was developed to simultaneously collect LDV velocity and video from videolaryngoscopy. The velocity along the direction of the laser beam, i.e., the inferior-superior direction, was captured. The velocity was synchronous with electroglottograph and sound level meter data. The vibration energy of the vocal folds was determined to be significant up to a frequency of 3 kHz. Three characteristic vibrational waveforms were identified which may indicate bifurcations between vibrational modes of the mucosal wave. No relationship was found between the velocity amplitude and phonation frequency or sound pressure level. A correlation was found between the peak-to-peak displacement amplitude and phonation frequency. A sparse map of the velocity amplitudes on the vocal fold surface was obtained.
本研究旨在使用激光多普勒振动计（LDV）测量人声带的上表面在发声时的速度。设计并制造了一个定制的内窥镜激光束偏转单元。开发了一种体内临床实验程序，以同时从视频喉镜收集 LDV 速度和视频。捕获了沿激光束方向（即上下方向）的速度。速度与声门图和声级计数据同步。确定声带的振动能量在 3 kHz 频率以下具有显著意义。确定了三种特征振动波形，这可能表明黏膜波振动模式之间的分叉。速度幅度与发音频率或声压级之间没有关系。在峰峰值位移幅度和发音频率之间发现了相关性。获得了声带表面上速度幅度的稀疏图。
