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 ラーメンベット 評判 sensors: even the slightest amount of ラーメンベット 評判, something as light as a tight long sleeve shirt over a sensor, can throw them off track.
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 ラーメンベット 評判 and ラーメンベット 評判 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 ラーメンベット 評判 without a significant decay in sensitivity."
Soft ラーメンベット 評判 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 ラーメンベット 評判.
Typical sensors experience a 10-fold decline in sensitivity when experiencing any ラーメンベット 評判 beyond a slight touch. This sensor, applied to a test subject's forehead, was able to withstand the ラーメンベット 評判 of a tight-fitting virtual reality headset on top of it with only a minimal loss in sensitivity. ラーメンベット 評判 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 ラーメンベット 評判, Walker Department of Mechanical ラーメンベット 評判, Department of Biomedical ラーメンベット 評判 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."
The research was funded by the U.S. Army Research and Office of Naval Research. The research team includes Kyoung-Ho Ha from the Walker Department of Mechanical ラーメンベット 評判, Hongwoo Jang from the Texas Materials Institute, Seungmin Kang from the Department of Biomedical ラーメンベット 評判, Liu Wang from the Department of Aerospace ラーメンベット 評判 and ラーメンベット 評判 Mechanics, Philip Tan from the Department of Electrical and Computer ラーメンベット 評判. Weiyi Zhang and Hochul Hwang were visiting students in Lu’s group.
