• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Optics Letters >Lock-in spectroscopy employing a high-speed camera and a micro-scanner for volumetric investigations of unsteady flows
【24h】

Lock-in spectroscopy employing a high-speed camera and a micro-scanner for volumetric investigations of unsteady flows

机译：锁定光谱仪，采用高速相机和微型扫描仪对不稳定流进行体积研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Spectroscopic methods are established tools for nonintrusive measurements of flow velocity. However, those methods are either restricted by measuring pointwise or with low measurement rates of several hertz. To investigate fast unsteady phenomena, e.g., in sprays, volumetric (3D) measurement techniques with kHz rate are required. For this purpose, a spectroscopic technique is realized with a power amplified, frequency modulated laser and an Mfps high-speed camera. This allows fast continuous planar measurements of the velocity. Volumetric data is finally obtained by slewing the laser light sheet in depth with an oscillating microelectromechanical systems (MEMS) scanner. As a result, volumetric velocity measurements are obtained for 256 × 128 × 25 voxels over 14.4 mm × 7.2 mm × 6.5 mm with a repetition rate of 1 kHz, which allows the investigation of unsteady phenomena in sprays such as transients and local velocity oscillations. The respective measurement capabilities are demonstrated by experiments. Hence, a significant progress regarding the data rate was achieved in spectroscopy by using the Mfps high-speed camera, which enables new application fields such as the analysis of fast unsteady phenomena.
机译：光谱法是用于非侵入式测量流速的工具。但是，这些方法要么受到逐点测量的限制，要么受到几赫兹的低测量速率的限制。为了研究快速的不稳定现象，例如在喷雾中，需要使用kHz速率的体积（3D）测量技术。为此，利用功率放大的调频激光器和Mfps高速相机实现了光谱技术。这样可以快速连续进行速度平面测量。最终，通过使用振荡微机电系统（MEMS）扫描仪将激光片深切，可以获得体积数据。结果，在14.4 mm×7.2 mm×6.5 mm范围内以256×128×25体素获得了体积速度测量值，重复频率为1 kHz，这使得可以研究喷雾中的不稳定现象，例如瞬态和局部速度振荡。通过实验证明了各自的测量能力。因此，通过使用Mfps高速相机在光谱学上在数据速率方面取得了重大进展，这使新的应用领域成为可能，例如快速不稳定现象的分析。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号