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Two-dimensional distributed strain sensing with an Archimedean spiral arrangement in optical frequency domain reflectometry 认领 引用 被引量：2
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作者 Yamei Guo Zhenyang Ding +3 位作者 Kun Liu Junfeng Jiang Chenhuan Wang Tiegen Liu 《Nanotechnology and Precision Engineering》 EI CAS CSCD 2018年第3期187-190,共4页
We demonstrate a distributed two-dimensional(2D)strain-sensing system in optical frequency domain reflectometry(OFDR)with an Archimedean spiral arrangement of the sensing fiber.The Archimedean spiral describes a simpl... We demonstrate a distributed two-dimensional(2D)strain-sensing system in optical frequency domain reflectometry(OFDR)with an Archimedean spiral arrangement of the sensing fiber.The Archimedean spiral describes a simple relationship between the radial radius and polar angle,such that each circle(the polar angle from0 to 2π)can sense the 2D strain in all directions.The strain between two adjacent circles can also be easily obtained because an Archimedean spiral facilitates sensing of every angle covering the full 2D range.Based on the mathematical relation of Archimedean spirals,we deduce the relationship between the one-dimensional position of the sensing fiber and 2D distribution in polar coordinates.The results of the experiment show that an Archimedean spiral arrangement system can achieve 2D strain sensing with different strain load angles. 展开更多
关键词 Optical frequency domain reflectometry (OFDR) Archimedean spiral Distributed optical fiber sensing
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Chirality-induced spin selectivity of graphene chiral superstructures and their true/false chirality of electron motion 认领 引用
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作者 Xueying Qin Yi Sun +6 位作者 Yamei Guo Xiaopeng Li Ji Liu Zhuwei Zhang Xiangyun Ma Qifeng Li Yongtao Shen 《Nano Research》 SCIE EI CSCD 2025年第10期5-9,共5页
“Chiral-induced spin selectivity(CISS)”and its device applications are predominantly at the experimental stage,with mechanisms not fully understood.There is a need for new chiral materials with simple structures and... “Chiral-induced spin selectivity(CISS)”and its device applications are predominantly at the experimental stage,with mechanisms not fully understood.There is a need for new chiral materials with simple structures and high room-temperature electron spin polarization rates,crucial for theoretical studies and low-power spin optoelectronic devices.This study examines the CISS effect in carbon nanotubes,graphene chiral rolls,and graphene chiral stacks.While all three exhibit chirality,only the one-side follow curved surface of the graphene rolls demonstrates the CISS effect.Using true and false chirality analysis from Professor Barron,we found that only the charge motion(current)on the chiral surface is true chiral,leading to spin polarization.Thus,the CISS phenomenon occurs when charge motion on the chiral surface is chiral.Both chiral surface structures and chiral charge motion are necessary for electron spin polarization.Further theoretical validation of these conditions will enhance CISS theory. 展开更多
关键词 graphene chiral superstructure chiral-induced spin selectivity ture/false chirality
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