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For the visualization of gas motion based on local refractive index variations Background Oriented Schlieren (BOS, also known as Synthetic Schlieren) is a simple and cost-effective alternative to laser imaging methods, because it doesn’t need any complex illumination device like a laser needed for laser imaging, and it works without seeding the flow.
BOS is a line-of-sight imaging technique and measures locally the density gradient as an integrated value over the line-of-sight. In practice, only a random dot pattern in the background of the flow is imaged with a high resolution camera before and during the test. By comparing the two pictures (or more precisely correlating the two patterns similar to the image correlation in PIV) the local displacement of the background pattern can be used to provide lateral information on path-integrated refractive index variations.
simple flow visualization technique without laser and flow seeding
advanced image correlation technique applied on background target
BOS software module in DaVis for quantitative density (temperature)
imaging in 2D and axisymmetric flows
LaVision’s Tomo-BOS imaging systems measure quantitatively density or temperature fields in 3D using multiple camera BOS projections. This 3D imaging technique requires an accurate geometrical calibration of the multi-camera system and an iterative tomographic reconstruction algorithm.
instantaneous 3D temperature (density) fields
flexible multi-camera setups
high-speed tomographic BOS imaging for time-resolved measurements
保修期: 1年
是否可延长保修期: 是
现场技术咨询: 有
免费培训: 一人次
免费仪器保养: 质保期内一次
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报修承诺: 一周内到达用户现场开始维修
LaVision GmbH纹影仪FluidMaster-BOS的工作原理介绍
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