Abstract
Mechanoreceptors in a fingertip convert external tactile stimulations into electrical signals, which are transmitted by the nervous system through synaptic transmitters and then perceived by the brain with high accuracy and reliability. Inspired by the human synapse system, this paper reports a robust tactile sensing system consisting of a remote touch tip and a magnetic synapse. External pressure on the remote touch tip is transferred in the form of air pressure to the magnetic synapse, where its variation is converted into electrical signals. The developed system has high sensitivity and a wide dynamic range. The remote sensing system demonstrated tactile capabilities over wide pressure range with a minimum detectable pressure of 6 Pa. In addition, it could measure tactile stimulation up to 1,000 Hz without distortion and hysteresis, owing to the separation of the touching and sensing parts. The excellent performance of the system in terms of surface texture discrimination, heartbeat measurement from the human wrist, and satisfactory detection quality in water indicates that it has considerable potential for various mechanosensory applications in different environments.
Highlights
Tactile sensation recognizing from surrounding environment through the direct contact of force, vibration and temperature, is regarded as a next-generation technology for applications in information gathering and transfer as well as artificial intelligence[1,2,3,4]
Inspired by human tactile sensing and synaptic transmission, this paper proposes a remote tactile sensing system integrated with a magnetic synapse to overcome the above-mentioned issues of flexible tactile sensors
The magnetic field intensity changes as the thin elastomer membrane is deflected by air pressure, which varies under external stress from the remote touch tip and is transmitted through the air tube
Summary
Sunjong Oh1, Youngdo Jung[1], Seonggi Kim[1], SungJoon Kim[2], Xinghao Hu2, Hyuneui Lim1 & CheolGi Kim[2]. The magnetic synapse is composed of a thin elastomer membrane with an embedded permanent magnet above a magnetoresistive (MR) sensing element It exhibits the most fascinating characteristics of remote tactile sensing from the viewpoints of both high sensitivity (30 mg) and a wide dynamic range (6 Pa ~400 kPa). The developed remote tactile sensing system has high sensitivity and excellent durability over a wide dynamic pressure range without any hysteresis It can successfully detect surface texture differences, sense the heart rate from the human wrist, and is operable even in water. The Ecoflex membrane has an embedded permanent magnet whose position changes as the Ecoflex membrane is deflected by air pressure variations generated in the remote touch tip by external stimulations These movements induce variations in the magnetic field strength of the MR sensing element, which generates electrical output signals . The remote tactile sensing system with the robot hand successfully monitored the heart rate and relative blood pressure in situ with heart physiology information, as the output signal patterns showed that the heart rate and relative blood pressure increased after exercise
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