其他null检测 | 采用高速CMOS成像系统进行FLEET测速的精度分析-北京欧兰科技发展有限公司

方案摘要

方案下载

应用领域	能源/新能源
检测样本	其他
检测项目
参考标准	暂无

利用LaVision公司的科研型CMOS相机sCMOS和Photron公司高速相机Phontron FASTCAM SA-X2加装LaVision公司的高速图像增强器IRO进行了飞秒激光电子激发标志-Femtosecond laser electronic excitation tagging (FLEET)测速实验，并进行了性能和结果对比分析。

方案下载

配置单

Imager sCMOS PIV相机
型号：Imager sCMOS

面议
咨询

方案详情

Femtosecond laser electronic excitation tagging (FLEET) is an optical measurement
technique that permits quantitative velocimetry of unseeded air or nitrogen using a single
laser and a single camera. In this paper, we seek to determine the fundamental precision of
the FLEET technique using high-speed complementary metal-oxide semiconductor (CMOS)
cameras. Also, we compare the performance of several different high-speed CMOS camera
systems for acquiring FLEET velocimetry data in air and nitrogen free-jet flows. The
precision was defined as the standard deviation of a set of several hundred single-shot
velocity measurements. Methods of enhancing the precision of the measurement were
explored such as digital binning (similar in concept to on-sensor binning, but done in postprocessing),
row-wise digital binning of the signal in adjacent pixels and increasing the time
delay between successive exposures. These techniques generally improved precision;
however, binning provided the greatest improvement to the un-intensified camera systems
which had low signal-to-noise ratio. When binning row-wise by 8 pixels (about the thickness
of the tagged region) and using an inter-frame delay of 65 μs, precisions of 0.5 m/s in air and
0.2 m/s in nitrogen were achieved. The camera comparison included a pco.dimax HD, a
LaVision Imager scientific CMOS (sCMOS) and a Photron FASTCAM SA-X2, along with a
two-stage LaVision HighSpeed IRO intensifier. Excluding the LaVision Imager sCMOS, the
cameras were tested with and without intensification and with both short and long interframe
delays. Use of intensification and longer inter-frame delay generally improved
precision. Overall, the Photron FASTCAM SA-X2 exhibited the best performance in terms
of greatest precision and highest signal-to-noise ratio primarily because it had the largest
pixels.
Nomenclature

上一篇在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位

下一篇串联气泡诱导喷射流动导致的细胞膜形变和生物效应

文献贡献者

北京欧兰科技发展有限公司

金牌会员丨第17年

查看全部资料