Flexible tactile sensing is a persistent bottleneck for robots, wearables, and bedside monitoring systems—especially when devices must remain reliable on curved skin-like surfaces while operating safely in humid, hot, or highly deforming environments. A new review from the North University of China spotlights a promising approach: flexible electromagnetic induction-type tactile sensors, known as FTS-EMI. Rather than relying on externally supplied bias voltages, these sensors generate signals using the physics of electromagnetic induction driven by touch.
The core idea is simple but powerful. When a surface is pressed or moved, there is relative motion between a permanent magnet and a coil. This motion alters magnetic flux and induces an electrical output. Because the output arises directly from contact-induced dynamics, FTS-EMI can support dynamic touch sensing while reducing power demands—an advantage for compact wearable electronics and robotic systems operating in complex mechanical conditions.
A key message of the review is that performance is not determined by any single component. The authors argue FTS-EMI should be treated as an integrated sensing system, where the magnet design, flexible coil geometry, mechanical structure, and backend signal-processing pipeline must be engineered together. In practice, the same touch event can produce different signal signatures depending on how the magnet and coil move under deformation, so system-level coordination is essential.
To organize progress in the field, the review proposes a three-layer framework spanning fabrication process, structural design, and backend processing. It maps how permanent magnets, flexible coils, magnetic soft composites, bionic mechanical layouts, microcolumn arrays, circuits, and algorithms collectively shape sensitivity, resolution, and robustness.
The authors also emphasize pathways for moving from lab prototypes toward real products. They call for application-oriented design, standardized performance evaluation, and multimodal integration with other tactile modalities such as piezoelectric, capacitive, or resistive mechanisms. Such combinations could improve decoupling of multi-directional forces and enhance the reliability of sensing in real-world conditions.
In terms of applications, the review surveys uses ranging from fingertip-like tactile sensing to multidimensional force decoupling and health monitoring, as well as human–machine interaction and intelligent robotics. By leveraging electromagnetic induction’s ability to produce electrical outputs directly from touch-induced motion, FTS-EMI may offer a route to low-power tactile interfaces that remain stable under environmental stressors.
Subject of Research:
Flexible electromagnetic induction-type tactile sensors (FTS-EMI)
Article Title:
Flexible electromagnetic induction-type tactile sensors: Progress and prospects
News Publication Date:
2026
Web References:
https://doi.org/10.1016/J.WEES.2026.03.003
References:
Literature review (review article) — DOI: 10.1016/J.WEES.2026.03.003
Image Credits:
Xiaojuan Hou, Xin Zhang, Shaowei Quan, Fen Li, Huipeng Zhao, Shuo Qian, Wenping Geng, Jian He And Xiujian Chou / North University of China
Keywords:
Wearable electronics; tactile sensing; flexible sensors; electromagnetic induction; robotics; health monitoring
