Capacitive eye tracker made of fractured carbon nanotube-paper composites for wearable applications
Capacitive eye tracker made of fractured carbon nanotube-paper composites for wearable applications
复制标题
由断裂碳纳米管纸复合材料制成的电容式眼动仪，用于可穿戴应用
DOI：
10.1016/j.sna.2022.113739
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Chung, Jae-Hyun
中科院分区：
文献类型：
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作者：
Sakthivelpathi, Vigneshwar;Qian, Zhongjie;Li, Tianyi;Ahn, Sanggyeun;Dichiara, Anthony B.;Soetedjo, Robijanto;Chung, Jae-Hyun
眼睛、面部几何形状和注视方向的独特性使得眼动跟踪成为一项非常具有挑战性的技术追求。虽然基于相机的眼睛跟踪系统很流行，但其笨重设备的突兀性沿着其高计算成本和功耗被认为是可穿戴应用的问题。已经尝试了使用电容感测技术的非接触注视监测，但是由于低灵敏度和寄生电容而失败。在这里，我们研究了一种新型的电容传感器和眼动可穿戴眼动跟踪之间的相互作用。电容传感器由一对非对称电极制成;一个电极包括碳纳米管-纸复合纤维（CPC），另一个电极是矩形金属电极。数值分析了非对称传感器与仿眼球球形物体之间的相互作用。使用面部模拟器，单和差分电容测量的特征在于相对于接近度，几何形状和人体电荷。使用原型眼动仪，多个传感器的位置进行了研究，以确定最佳配置。的电容响应垂直和水平的视线方向进行了分析比较，商业眼动跟踪系统。性能证明敏感的眼动跟踪，闭眼监测，人机界面。这项研究对电容式可穿戴眼动仪的开发具有重要意义，可以促进人机界面，认知监测，神经科学研究和康复等领域。
The uniqueness of eyes, facial geometry, and gaze direction makes eye tracking a very challenging technological pursuit. Although camera-based eye-tracking systems are popular, the obtrusiveness of their bulky equipment along with their high computational cost and power consumption is considered problematic for wearable applications. Noncontact gaze monitoring using capacitive sensing technique has been attempted but failed due to low sensitivity and parasitic capacitance. Here, we study the interaction between a novel capacitive sensor and eye movement for wearable eye-tracking. The capacitive sensors are made of a pair of asymmetric electrodes; one comprising carbon nanotube-paper composite fibers (CPC) and the other being a rectangular metal electrode. The interaction between the asymmetric sensor and a spherical object mimicking an eyeball is analyzed numerically. Using a face simulator, both single- and differential capacitive measurements are characterized with respect to proximity, geometry, and human body charge. Using a prototype eye tracker, multiple sensor locations are studied to determine the optimal configurations. The capacitive responses to vertical and horizontal gaze directions are analyzed in comparison to those of a commercial eye tracking system. The performance is demonstrated for sensitive eye-movement tracking, closed-eye monitoring, and human-machine interface. This research has important implications for the development of capacitive, wearable eye trackers, which can facilitate fields of human-machine interface, cognitive monitoring, neuroscience research, and rehabilitation.