MODIS Leaf Area Index (LAI) And Fraction Of Photosynthetically Active Radiation Absorbed By Vegetation (FPAR) Product
MODIS Leaf Area Index (LAI) And Fraction Of Photosynthetically Active Radiation Absorbed By Vegetation (FPAR) Product
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DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
Y. Knyazikhin;J. Glassy;J. Privette;Yourong Tian;A. Lotsch;Yao Zhang;Yong Wang;J. Morisette;
中科院分区：
文献类型：
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作者：
Y. Knyazikhin;J. Glassy;J. Privette;Yourong Tian;A. Lotsch;Yao Zhang;Yong Wang;J. Morisette;
在用于检测流体流的装置中，细长体（例如线）被支撑，使得当其长度的大部分暴露于流动流体且所述部分的纵向轴线布置成基本上横向于流体流时，可以通过涡旋脱落引起所述部分振动；机电换能器耦合到主体以响应于振动而产生电信号；并且检测电信号的存在，以作为安全开关操作，或者检测振动频率，以测量流体流量、流体速度等。
In a device for detecting fluid flow, an elongated body, such as a wire, is supported so that when a substantial portion of its length is exposed to a flowing fluid with the longitudinal axis of said portion arranged substantially transverse to the fluid flow, said portion can be caused to vibrate by vortex shedding; an electromechanical transducer is coupled to the body so as to produce an electrical signal in response to the vibration; and either the presence of the electrical signal is detected, for operation as a safety switch, or the frequency of the vibrations is detected, for measurement of fluid flow rate, fluid velocity etc.