Directly Visualizing Tactile Perception and Ultrasensitive Tactile Sensors by Utilizing Body‐Enhanced Induction of Ambient Electromagnetic Waves

Abstract

Tactile recognition is a critical technology for many applications. Here, it is found that the ambient electromagnetic signal, which is usually regarded as electromagnetic noise, can be a good triggering source to realize tactile detection. A circuit consisting of two light emitting diodes (LEDs) is designed as sensor unit and human contact can amplify the electrostatic signal induced by electromagnetic wave in this circuit, which enhances the brightness of the LEDs. Hence, visualizing tactile perception can be achieved based on this strategy. Accordingly, a stretchable and semi-transparent sensor matrix is established for mapping detailed contact positions, on which the contact force can be smaller than 0.001 N. The detection and the visualization of sliding trajectory and pressure change are also demonstrated by using this sensory method, indicating its good applicability for different purposes. Electromagnetic wave universally exists in the working places and tactile sensors based on this strategy can be possibly applied to many fields such as factory automation, intelligent robotics, human-machine interaction, etc.

Dripping Channel Based Liquid Triboelectric Nanogenerators for Energy Harvesting and Sensing

“…This could be attributed to the electromagnetic waves in the space, which can cause fluctuations of electrical potential between metal electrodes, and charge a capacitor via rectification. 36 When droplets were applied, a voltage of 5.39 V could be achieved in 600 s (Figure 5f). The liquid level in the funnel was between 400 and 500 mL in the experiment, and the droplet size was about 99 μL.…”

“…The capacitor can be charged to 2.98 V in 600 s without water droplets (Figure f). This could be attributed to the electromagnetic waves in the space, which can cause fluctuations of electrical potential between metal electrodes, and charge a capacitor via rectification . When droplets were applied, a voltage of 5.39 V could be achieved in 600 s (Figure f).…”

Progress inTENGtechnology—A journey from energy harvesting to nanoenergy and nanosystem

“…Copyright 2018, Nature 134 tactile sensory matrix formed by the integration of multisensors can achieve real-time stimulus mapping for various human-machine interactions. [135][136][137][138][139][140] As shown in Figure 3B, a self-powered triboelectric tactile sensory matrix was developed to realize high-resolution tactile mapping by pressure-sensitive pixels. 130 When an object contacts or moves on the top polydimethylsiloxane (PDMS) surface, electrical signals are generated on the corresponding pixels according to the charge transfer between the sensing electrodes and the ground.…”

“…Thus, the developed self‐powered pressure sensor demonstrates promising potentials in human health monitoring toward higher convenience and self‐sustainability. On the other hand, the tactile sensory matrix formed by the integration of multi‐sensors can achieve real‐time stimulus mapping for various human‐machine interactions 135‐140 . As shown in Figure 3B, a self‐powered triboelectric tactile sensory matrix was developed to realize high‐resolution tactile mapping by pressure‐sensitive pixels 130 .…”

A Motion Vector Sensor via Direct‐Current Triboelectric Nanogenerator

“…Most importantly, based on its unique working mechanism, the electromagnetic signal interference from environment and electrostatic disturbance from electrostatic induction can be greatly eliminated. [36][37][38] With these capabilities, a triboelectric sensor based on DC-TENG may provide a simple solution to realize a self-powered motion sensing technology with tiny size and high sensitivity. However, there is no report about sensing application of DC-TENG to our best knowledge.…”