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基于空间微螺线管电感的微米级磨粒检测研究 被引量:8
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作者 张洪朋 张银东 +3 位作者 张春花 沈岩 潘新祥 李冬青 《机床与液压》 北大核心 2012年第21期48-50,共3页
基于液压油污染检测颗粒计数法中的电感检测法,利用含有磨粒的液压油流经空间微螺线管时引起的磁通量的变化,进而检测电感的变化量测得磨粒,并根据电感的增大或减小判断磨粒的性质。实验中铁颗粒引起电感增大,铜颗粒引起电感减小。通过... 基于液压油污染检测颗粒计数法中的电感检测法,利用含有磨粒的液压油流经空间微螺线管时引起的磁通量的变化,进而检测电感的变化量测得磨粒,并根据电感的增大或减小判断磨粒的性质。实验中铁颗粒引起电感增大,铜颗粒引起电感减小。通过改变漆包线的匝数和直径观察电感变化量和变化率,总结和分析其变化规律。结果表明:该微螺线管能检测到的铁磁颗粒尺寸最小可达50μm。该检测方法测量准确度高,具有良好的实际应用价值与广阔的发展前景。 展开更多
关键词 金属磨粒 电感检测法 微螺线管 检测极限
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Automatic detection of respiratory rate from electrocardiogram,respiration induced plethysmography and 3D acceleration signals 被引量:3
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作者 刘官正 吴丹 +2 位作者 梅占勇 朱青松 王磊 《Journal of Central South University》 SCIE EI CAS 2013年第9期2423-2431,共9页
Respiratory monitoring is increasingly used in clinical and healthcare practices to diagnose chronic cardio-pulmonary functional diseases during various routine activities.Wearable medical devices have realized the po... Respiratory monitoring is increasingly used in clinical and healthcare practices to diagnose chronic cardio-pulmonary functional diseases during various routine activities.Wearable medical devices have realized the possibilities of ubiquitous respiratory monitoring,however,relatively little attention is paid to accuracy and reliability.In previous study,a wearable respiration biofeedback system was designed.In this work,three kinds of signals were mixed to extract respiratory rate,i.e.,respiration inductive plethysmography(RIP),3D-acceleration and ECG.In-situ experiments with twelve subjects indicate that the method significantly improves the accuracy and reliability over a dynamic range of respiration rate.It is possible to derive respiration rate from three signals within mean absolute percentage error 4.37%of a reference gold standard.Similarly studies derive respiratory rate from single-lead ECG within mean absolute percentage error 17%of a reference gold standard. 展开更多
关键词 respiration inductive plethysmography respiratory rate ELECTROCARDIOGRAM 3D acceleration activity
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