On the accuracy of framing-rate measurements in ultra-high speed rotating mirror cameras.
On the accuracy of framing-rate measurements in ultra-high speed rotating mirror cameras.
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DOI：
10.1364/oe.19.016432
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发表时间：
2011-08
期刊：
影响因子：
3.8
通讯作者：
M. Conneely;H. Rolfsnes;C. Main;D. Mcgloin;P. Campbell
中科院分区：
文献类型：
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作者：
M. Conneely;H. Rolfsnes;C. Main;D. Mcgloin;P. Campbell
基于米勒原理的旋转镜系统是每秒1-25万帧范围内的超高速成像的主要方式。重要的是，这种相机记录的观测的真实时间精度对系统与每个单独数据采集直接相关的帧速率很敏感。本研究的目的是通过独立测量触发瞬间的帧率来检验这种系统报告帧率在广泛使用的商业系统（Cordin 550-62模型）中的有效性。在这里，我们发现这些测量之间有一个小而显著的差异：平均差异（在使用的帧速率的整个频谱上）被发现为0.66±0.48%，最大差异为2.33%。这种差异的主要原因可以追溯到系统协议中镜像旋转速率的未优化采样。因此，本文有三个目的：(i)我们强调了一种简单的诊断方法，以促进对旋转镜系统完整性的审查；（ii）我们提高了对先前通过该特定系统和模型获得的数据相关的固有误差的认识；（iii）我们建议未来的控制程序通过在触发瞬间实施实时测量来解决采样问题。
Rotating mirror systems based on the Miller Principle are a mainstay modality for ultra-high speed imaging within the range 1-25 million frames per second. Importantly, the true temporal accuracy of observations recorded in such cameras is sensitive to the framing rate that the system directly associates with each individual data acquisition. The purpose for the present investigation was to examine the validity of such system-reported frame rates in a widely used commercial system (a Cordin 550-62 model) by independently measuring the framing rate at the instant of triggering. Here, we found a small but significant difference between such measurements: the average discrepancy (over the entire spectrum of frame rates used) was found to be 0.66 ± 0.48%, with a maximum difference of 2.33%. The principal reason for this discrepancy was traced to non-optimized sampling of the mirror rotation rate within the system protocol. This paper thus serves three purposes: (i) we highlight a straightforward diagnostic approach to facilitate scrutiny of rotating-mirror system integrity; (ii) we raise awareness of the intrinsic errors associated with data previously acquired with this particular system and model; and (iii), we recommend that future control routines address the sampling issue by implementing real-time measurement at the instant of triggering.