An assessment of high-power light-emitting diodes for high frame rate schlieren imaging

被引:0
|
作者
Christian E. Willert
Daniel M. Mitchell
Julio Soria
机构
[1] German Aerospace Center,DLR Institute of Propulsion Technology
[2] Monash University,Laboratory for Turbulence Research in Aerospace and Combustion (LTRAC), Department of Mechanical and Aerospace Engineering
[3] King Abdulaziz University,Department of Aeronautical Engineering
来源
Experiments in Fluids | 2012年 / 53卷
关键词
Particle Image Velocimetry; Acoustic Field; Mach Disk; Schlieren Imaging; Nozzle Pressure Ratio;
D O I
暂无
中图分类号
学科分类号
摘要
The feasibility of using high-power light-emitting diodes (LED) as a light source for high frame rate schlieren imaging is investigated. Continuous sequences of high-intensity light pulses are achieved by overdriving the LED with current pulses up to a factor of ten beyond its specifications. In comparison to commonly used pulsed light sources such as gas discharge lamps and pulsed lasers, the pulsed LED has several attractive advantages: the pulse-to-pulse intensity variation is on the same order of magnitude as the detector (camera) noise permitting quantitative intensity measurements. The LED’s narrow emission bandwidth reduces chromatic abberations, yet it is spectrally wide enough to prevent the appearance of speckle and diffraction effects in the images. Most importantly, the essentially lag-free light emission within tens of nanoseconds of the applied current pulse allows the LED to be operated at varying frequencies (i.e., asynchronously), which generally is not possible with neither lasers nor discharge lamps. The pulsed LED source, driven by a simple driver circuit, is demonstrated on two schlieren imaging setups. The first configuration visualizes the temporal evolution of shock structures and sound waves of an under-expanded jet that is impinging on a rigid surface at frame rates of 500 kHz to 1 MHz. In a second application, long sequences of several thousand high-resolution images are acquired on a free jet at a frame rate of 1 kHz. The low-intensity fluctuation and large sample number allow a reliable computation of two-point correlation data from the image sequences.
引用
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页码:413 / 421
页数:8
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