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Soft pressure sensor breakthrough solves field's most challenging bottleneck
Science News from research organizations 1 . 2 . Soft pressure sensor breakthrough solves field's most challenging bottleneck . Date: September 28, 2021 Source: University of Texas at Austin Summary: Researchers solved one of the biggest problems with existing wearable pressure sensors: even the slightest amount of pressure, something as light as a tight long sleeve shirt over a sensor, can throw them off track -- and they did it by innovating a first-ever hybrid sensing approach that allows the device to possess properties of the two predominant types of sensors in use today. Share: FULL STORY Medical sensing technology has taken great strides in recent years, with the development of wearable devices that can track pulse, brain function, biomarkers in sweat and more. However, there is one big problem with existing wearable pressure sensors: even the slightest amount of pressure, something as light as a tight long sleeve shirt over a sensor, can throw them off track. advertisement Texas Engineers have solved this problem, which has been vexing the field for years now. And they did it by innovating a first-ever hybrid sensing approach that allows the device to possess properties of the two predominant types of sensors in use today. "The field of flexible pressure sensors is extremely crowded, and after two decades we hit a bottleneck because no one could solve the tradeoff between pressure and sensitivity," said Nanshu Lu, an associate professor in the Department of Aerospace Engineering and Engineering Mechanics and the corresponding author of the new research published today in Advanced Materials . "This is the first sensor able to leverage a new hybrid mode to withstand pressure without a significant decay in sensitivity." Soft pressure sensors today are generally made of three layers -- a deformable sensing layer sandwiched in between a pair of electrodes. These sensors generally fall into one of two categories -- piezo-capacitive and piezo-resistive. Lu's team utilized an electrically conductive and highly porous nanocomposite as the sensing layer and added an extra insulating layer to the sensor, which gave it capabilities of both types of sensors. This new hybrid sensing is what allows it to better withstand pressure. Typical sensors experience a 10-fold decline in sensitivity when experiencing any pressure beyond a slight touch. This sensor, applied to a test subject's forehead, was able to withstand the pressure of a tight-fitting virtual reality headset on top of it with only a minimal loss in sensitivity. Pressure can not only cause a loss of accuracy in many sensors, but it can blunt the ability to deliver a reading at all. "As we apply external pressure, the sensitivity drops, but is still on par with other sensors at zero pressure," said Lu, who also has appointments in the Department of Electrical and Computer Engineering, Walker Department of Mechanical Engineering, Department of Biomedical Engineering and UT Austin's Texas Materials Institute. Lu has long been a pioneer in this sensing field, primarily through her electronic tattoo technology -- a series of devices that are so lightweight and stretchable that they can be placed over the heart, the brain, or the muscle for extended periods with little or no discomfort. But, Lu has even grander visions for these sensors and e-tattoos. She is working on ways to allow the sensor material to be wrapped around almost any object and give it the sensitivity of human skin. The most obvious application is wrapping it around robotic hands and fingers to give them the ability to recognize objects by touching them. But there are many other things it could do. "The applications could be unlimited," Lu said. "Stretchable, e-skin could be wrapped around almost any object." Video of Soft Pressure Sensor Breakthrough: https://www.youtube.com/watch?v=AXcGxeOYLkY make a difference: sponsored opportunity Story Source: Materials provided by University of Texas at Austin . Note: Content may be edited for style and length. Journal Reference : KyoungHo Ha, Weiyi Zhang, Hongwoo Jang, Seungmin Kang, Liu Wang, Philip Tan, Hochul Hwang, Nanshu Lu. Highly Sensitive Capacitive Pressure Sensors over a Wide Pressure Range Enabled by the Hybrid Responses of a Highly Porous Nanocomposite . Advanced Materials , 2021; 2103320 DOI: 10.1002/adma.202103320 . Cite This Page : MLA . APA . Chicago . University of Texas at Austin. "Soft pressure sensor breakthrough solves field's most challenging bottleneck." ScienceDaily. ScienceDaily, 28 September 2021. . University of Texas at Austin. (2021, September 28). Soft pressure sensor breakthrough solves field's most challenging bottleneck. ScienceDaily . Retrieved September 29, 2021 from www.sciencedaily.com/releases/2021/09/210928171917.htm University of Texas at Austin. "Soft pressure sensor breakthrough solves field's most challenging bottleneck." ScienceDaily. www.sciencedaily.com/releases/2021/09/210928171917.htm (accessed September 29, 2021). RELATED TOPICS Matter & Energy Wearable Technology . Detectors . Civil Engineering . Thermodynamics . Computers & Math Neural Interfaces . Artificial Intelligence . Robotics . Mobile Computing . advertisement RELATED TERMS Boiling . Altitude . Speed of sound . Altimeter . Pressure . Particle accelerator . Hydrogen-like atom . Fracking . 1 . 2 . 3 . 4 . 5 . RELATED STORIES Lean and Mean: Building a Multifunctional Pressure Sensor With 3D Printing Technology . July 14, 2021 ? Pressure sensors are important tools for accurate sensing of applied forces. However, they can mostly sense forces along only a single direction. In a new study, scientists take things to the next ... Having an Eye for Colors: Printable Light Sensors . Feb. 24, 2020 ? Cameras, light barriers, and movement sensors have one thing in common: they work with light sensors that are already found in many applications. In future, these sensors might also play an important ... A Self-Healing Sweat Sensor . Dec. 18, 2019 ? Wearable sensors that track heart rate or steps are popular fitness products. But in the future, working up a good sweat could provide useful information about a person's health. Now, researchers ... Feeling the Pressure With Universal Tactile Imaging . Nov. 15, 2018 ? Researchers developed a universal tactile imaging technology for pressure distribution measurement using a coupled conductor pair. An image processing approach based on tomography was then used to ... 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