Towards inclusive wearable sensors: Polarized light boosts accuracy of wearable health sensors for all skin tones
Peer-Reviewed Publication
Updates every hour. Last Updated: 10-Dec-2025 17:11 ET (10-Dec-2025 22:11 GMT/UTC)
Researchers at Brown University have developed a wearable sensor that uses polarized light to improve the accuracy of photoplethysmography (PPG) signals across different skin tones. Conventional pulse oximeters often underperform on darker skin due to light absorption and scattering by melanin. The new device combines two wavelengths with cross-polarized detection to reduce superficial scattering and enhance deeper vascular signals. In tests with volunteers of light, medium, and brown skin tones, cross-polarization significantly increased perfusion index—a measure of signal strength—compared to co-polarized detection. This approach could help make wearable health technologies more equitable and reliable.
A research paper by scientists at Shanghai Jiao Tong University presented a novel integrated piezoelectric module (IPEM) based on a piezoelectric ceramic element designed specifically for bio-membrane puncture and insertion applications.
The research paper, published on Oct. 21, 2025 in the journal Cyborg and Bionic Systems.
Researchers from the Universitat Autònoma de Barcelona (UAB) and the University of the Witwatersrand, South Africa, consolidate their longstanding collaboration by presenting in Nature Photonics a comprehensive collection of the latest advances in quantum structured light, an emerging field that allows increasing the amount of information that light can transport. This technology has potential applications in more secure communications, faster quantum computing, and high-sensitivity detection systems.
A 2024 Gartner survey found 48% of R&D organizations have a formal technology scouting process.
Scouts bridge gaps between external startups and in-house teams to spark innovation. They source new ideas and knowledge from the outside world, helping companies create new and better products and make processes more efficient.
But new research from Francisco Polidoro Jr., professor of management at Texas McCombs, finds a hidden tension among knowledge scouts. A key part of their role — working with multiple divisions to foster collaboration — can actually make them less effective, not more.