利用实验测得的粒子图像实现立体PIV的自标定

2018/12/04   下载量： 4 次

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应用领域 其他
检测样本 其他
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这是立体PIV测量中标定方法的一种图突破和创新。标定过程不再需要进行危险，费时，低效的将片状光源和标定板严格对准的过程。大大提高了标定效率和精度，并且能够拓展立体PIV测量的适用范围。像封闭环境，微小对象，标定板无法放置于内部的场合，也可以进行测量了。

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A stereo-PIV (stereo particle image velocimetry)
calibration procedure has been developed based on
fitting a camera pinhole model to the two cameras using
single or multiple views of a 3D calibration plate. A
disparity vector map is computed on the real particle
images by cross-correlation of the images from cameras 1
and 2 to determine if the calibration plate coincides with
the light sheet. From the disparity vectors, the true position
of the light sheet in space is fitted and the mapping
functions are corrected accordingly. It is shown that it is
possible to derive accurate mapping functions, even if the
calibration plate is quite far away from the light sheet,
making the calibration procedure much easier. A modified
3-media camera pinhole model has been implemented
to account for index-of-refraction changes along
the optical path. It is then possible to calibrate outside
closed flow cells and self-calibrate onto the recordings.
This method allows stereo-PIV measurements to be taken
inside closed measurement volumes, which was not
previously possible. From the computed correlation
maps, the position and thickness of the two laser light
sheets can be derived to determine the thickness, degree
of overlap and the flatness of the two sheets.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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