Development of high-speed video cameras for Dynamic PIV

Abstract

The most promising next generation Image Velocimtry (IV) is the high-speed Dynamic PIV.It requires the development of innovative high-speed video camera sensors. We started by specifying Ole required performance of these new sensors, for measurements in air and water flows. These criteria founded on the most recent developments in PIV algorithms and incorporat e results from a large questionnaire survey of users of high-speed video cameras in Japan. The results suggest that the followings are required: (I ) frame rate of 1,000,000 fps, (2) pixel count of 1,000,000 pixels, (3) frame storage capacity of 100 -200 frames for tracing a single eve nt and 10,000 frames for turbulent measurements, (4) gray levels of 4 -8 bits for PTV; 12 bits for observation. Finally, we reviewed Ole state of the art of high-speed video-image sensors. Currently the standard parallel-readout sensors can operate at I Kfps with a pixel count of approximately I Kpixels. The In-situ Storage Image Sensor (ISIS) developed by the authors has recently achieved frame rates of 1 Mfps.

Optical imaging techniques for hypersonic impulse facilities

“…Images courtesy of H. Olivier, Shock Wave Laboratory, RWTH Aachen. x 10 6 1/m, h 0 = 4⋅8MJ/kg); four frames of a sequence of 100 frames obtained at 500,000fps with the high-speed video camera described in (19,20) ; time interval between shown frames: 20µs (15) .…”

“…speed photography apparatuses. Recent systems (19,20) , however, can record a sequence of one hundred images at framing rates of up to one million frames per second in full-frame mode. The obtained video images are marked by high resolution and outstanding quality (20) .…”

Evaluating fluid forces on bluff bodies using partial velocity data

“…Coupled together, these improvements allow high-density accurate 2-D velocity field projections to be extracted rapidly in 2-D planes (Upatnieks et al, 2002). Augmented with multiplane or laser sheet scanning techniques (Scarano et al, 2002;Heineck et al, 2002;Etoh et al, 2002) and stereoscopic systems (e.g., Meyer et al, 2002), such experimental techniques can provide a substantial velocity field map over a domain of interest.…”

Dynamic PIV measurement of a high-speed flow issuing from vent-holes of a curtain-type airbag

“…Recently, a dynamic PIV velocity field measurement technique was introduced with the advances of high-speed imaging devices and high-repetition pulse lasers. It is now possible for the dynamic PIV system to get instantaneous velocity field data at a very high time resolution (Etoh et al, 2002). Therefore, the dynamic PIV system is very useful for investigating temporal evolution of turbulent flows, especially the unsteady transient high-speed flows (Hwang et al, 2005).…”