A new optical bulk current sensor is presented with Bi(12)SiO(20) as a sensing crystal. Through the use of a mirror in the setup and the reciprocity of the optical activity of Bi(12)SiO(20), the sensor becomes insensitive to intrinsic linear birefringence and birefringence that is due to the enclosure of the crystal. Therefore the sensor is also insensitive to temperature, which affects the total linear birefringence. By making a computer model of the Bi(12)SiO(20) sensor, it was proved that the output signal of the sensor, which has a sinusoidal response, has a maximum relative error of 0.05%, apart from the variation of the Verdet constant, for a temperature change of approximately 100 °C.
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http://dx.doi.org/10.1364/AO.32.004869 | DOI Listing |
ACS Sens
January 2025
Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, United States.
Wearable sensors are increasingly being used as biosensors for health monitoring. Current wearable devices are large, heavy, invasive, skin irritants, or not continuous. Miniaturization was chosen to address these issues, using a femtosecond laser-conversion technique to fabricate miniaturized laser-induced graphene (LIG) sensor arrays on and encapsulated within a polyimide substrate.
View Article and Find Full Text PDFACS Appl Mater Interfaces
January 2025
Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Ophthalmology & Visual Sciences Key Lab, Beijing 100730, China.
Multiple ocular surface disorders are associated with the mechanical properties of the interface between the eyelid and cornea. Determining eyelid pressure is vital for diagnosing and preventing these disorders. However, current measurements rely on flat piezoresistive pressure sensor arrays that lack eye-motion sensing capabilities, resulting in discomfort and measurement inaccuracies.
View Article and Find Full Text PDFAdv Mater
January 2025
Department of Robotics and Mechatronics, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 42988, South Korea.
Triboelectric nanogenerators (TENGs) have gained significant attention for ability to convert mechanical energy into electrical energy. As the applications of TENG devices expand, their safety and reliability becomes priority, particularly where there is risk of fire or spontaneous combustion. Flame-retardant materials can be employed to address these safety concerns without compromising the performance and efficiency of TENGs.
View Article and Find Full Text PDFSmall Methods
January 2025
School of Materials Science and Engineering, China University of Petroleum, Qingdao, Shandong, 266580, China.
Optoelectronic synapse devices (OESDs) inspired by human visual systems enable to integration of light sensing, memory, and computing functions, greatly promoting the development of in-sensor computing techniques. Herein, dual-mode integration of bipolar response photodetectors (PDs) and artificial optoelectronic synapses based on ZnO/SnSe heterojunctions are presented. The function of the fabricated device can be converted between the PDs and OESDs by modulating the light intensity.
View Article and Find Full Text PDFAdv Mater
January 2025
College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.
New types of metal-organic framework (MOF) materials have great potential in solving the current global dilemma on energy, environment, and medical care. Herein, based on two kinds of biomolecule-MOFs (Bio-MOFs) with favorable biocompatibility and degradation-reconstruction characteristics, we have established a self-powered muti-functional device to achieve an efficient and broad-spectrum environmental energy collection and biomedical applications. Combining Zn(II) and carnosine-based Zn-Car_MOF possessing a high piezoelectric response (d = 11.
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