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Flexible skin sensors have the ability to be applied smoothly on soft, asymmetrical surfaces like the skin of a person or textile materials.
This is advantageous for applications that depend on conformability, such as soft robotics, smart tattoos, and artificial skin. As a result, research continues to focus on the development of new flexible sensor materials and structures as well as how to incorporate them into systems.
The paper describes the state of flexible sensor technologies at the moment and the effects of material advancements in this area. Strain, temperature, chemical, light, and electron potential sensors are given particular focus, along with the corresponding applications.
FLEXIBLE SKIN SENSOR MARKET SIZE AND FORECAST
The Global Flexible Skin Sensor market accounted for $XX Billion in 2023 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
A flexible sensor system prototype was developed and experimentally tested to offer a range of wireless wearable sensing capabilities, including temperature, voice, chewing/swallowing, breathing, pulse wave, and knee movement.
Real-time sensed data from these functions are shown on a smartphone. Although surfaces may have different topologies and geometries, flexible e-skin materials offer valuable deformability and conformability.
The resistance of a lot of contemporary e-skin devices made of flexible films or fabrics exhibits “piezoresistive” properties, meaning that it changes depending on static pressures outside the device.
It is possible to detect vocal cord movement or heart rate using another type of e-skin technology that is mostly used for energy harvesting applications.
This technology exhibits a “piezoelectric” feature when electrical charges are triggered in response to dynamic external pressures.
The triple e-skin function can be operated in P, Q, or T modes due to the ROIC’s reconfigurable construction.
In other words, the P mode provides the piezoresistive operation with a readout interface for the piezoresistive readout that can cover a range of static pressures, the Q mode for the piezoelectric function detects instantaneous device charges in response to external dynamic pressures, and the T mode detects temperature-induced resistance change.
The ROIC also incorporates data converters, such as the analog-to-digital converter (ADC).
A flexible multi-functional e-skin module is made and tested to provide six e-skin sensor operations on pulse wave, voice, swallowing, breathing, knee movements, and temperature while their real-time measured signals are wirelessly displayed on a screen. This is done to verify the viability of the proposed triple-mode e-skin sensor interface.
