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仪器网/ 行业应用/ 解决方案/ 约束流体3C-2D 速度场的数字高速全息测量

约束流体3C-2D 速度场的数字高速全息测量

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In the last years, several techniques have been developed and improved in such a way that it is
possible to measure the three velocity components in a flow. Some techniques as Stereoscopic PIV or
holographic PIV are well known. Others, like tomographic PIV started to develop more recently.
Stereoscopic Particle Image Velocimetry (SPIV) or Tomographic PIV need a complex set-up, involving flow
visualization with several cameras, and present important restrictions when applied to confined liquid flows.
Others like Holographic PIV cannot be applied in flows with a high particle density. Here a new technique,
called High Speed Digital Image Plane Holography has been developed for the measurement of the three
velocity components in a complex geometry brain aneurysm model using a configuration similar to regular
PIV. This was done by using a two cavity high speed laser, one double frame high speed camera and normal
visualization. The two in-plane velocity components were obtained from the holograms reconstructed
intensity distribution using a PIV analysis. The out-of plane component was obtained from the reconstructed
phase differences using an interferometric method. Due to the laser short coherence length, a portable and
compact system has been built in order to be able to the measure larger fluid areas. 时间分辨粒子成像测速系统(TR-PIV) HighSpeedStar PIV相机 用于粒子成像测速(PIV)的荧光示踪粒子
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