Kaczmarek Kurt A, Nammi Krishnakant, Agarwal Abhishek K, Tyler Mitchell E, Haase Steven J, Beebe David J
Department of Orthopedics and Rehabilitation Medicine, University of Wisconsin, Madison, WI 53706, USA.
IEEE Trans Biomed Eng. 2006 Oct;53(10):2047-54. doi: 10.1109/TBME.2006.881804.
Electrovibration is the tactile sensation of an alternating potential between the human body and a smooth conducing surface when the skin slides over the surface and where the current is too small to stimulate sensory nerves directly. It has been proposed as a high-density tactile display method, for example to display pictographic information to persons who are blind. Previous models for the electrovibration transduction mechanism are based on a parallel-plate capacitor in which the electrostatic force is insensitive to polarity. We present experimental data showing that electrovibratory perceptual sensitivity to positive pulses is less than that for negative or biphasic pulses and propose that this disparity may be due to the asymmetric electrical properties of human skin. We furthermore propose using negative pulses for insulated tactile displays based on electrovibration because their sensory thresholds were found to be more stable than for waveforms incorporating positive pulses.
当皮肤在光滑导电表面滑动且电流小到无法直接刺激感觉神经时，人体与该表面之间的交变电势会产生电振动触觉。它已被提议作为一种高密度触觉显示方法，例如向盲人展示象形信息。先前关于电振动转导机制的模型基于平行板电容器，其中静电力对极性不敏感。我们给出的实验数据表明，电振动对正脉冲的感知灵敏度低于对负脉冲或双相脉冲的感知灵敏度，并提出这种差异可能是由于人体皮肤的不对称电学特性所致。我们还提议基于电振动将负脉冲用于绝缘触觉显示，因为发现它们的感觉阈值比包含正脉冲的波形更稳定。
