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Single camera three component planar velocity measurements using two-frequency planar Doppler velocimetry (2ν-PDV)

机译:使用两频平面多普勒测速仪(2ν-PDV)进行单摄像机三分量平面速度测量

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摘要

Two-frequency planar Doppler velocimetry (2ν-PDV) is used in conjunction with imaging fibre bundles to make time-averaged three component velocity measurements using a single CCD camera and iodine cell. In this scheme the flow is sequentially illuminated with two different frequencies of laser light, which are separated by approximately 700 MHz to 1 GHz. Images are captured for each illumination frequency on a CCD camera viewing through an iodine absorption filter. These images are then used to produce a normalized transmission image that can be processed as in normal PDV. Three component measurements are made possible by porting separate views to a single CCD camera using the imaging fibre bundles. Results are presented here for a 2ν-PDV system demonstrated making time-averaged velocity measurements on a rotating disc and a seeded air jet.
机译:两频平面多普勒测速仪(2ν-PDV)与成像纤维束结合使用,可以使用单个CCD摄像机和碘池对时间进行平均三分量速度测量。在该方案中,用两个不同频率的激光依次照射流,这两个激光频率之间的间隔约为700 MHz至1 GHz。通过碘吸收滤光片在CCD摄像机上捕获每个照明频率的图像。这些图像然后用于产生可以像在普通PDV中一样处理的归一化透射图像。通过使用成像光纤束将单独的视图移植到单个CCD摄像机,可以进行三个分量的测量。此处显示的是2ν-PDV系统的结果,该系统演示了在转盘和播种空气喷嘴上进行时均速度测量的结果。

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