An image sensor which captures 100 consecutive frames at 1 000 000 frames/s

Etoh, Takeharu; Poggemann, D.; Kreider, G.; Mutoh, Hideki; Theuwissen, Albert; Ruckelshausen, Arno; Kondo, Yasushi; Maruno, Hiromasa; Takubo, Kenji; Soya, Hideki; Takehara, Kohsei; Okinaka, Tomoo; Takano, Yasuhide

doi:10.1109/ted.2002.806474

Cited by 148 publications

(78 citation statements)

References 6 publications

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“…1. The spray and liquid motions were observed with an ultrahigh-speed video camera ͑Shimadzu Hypervision͒ at frame rates up to 1 ϫ 10 6 frames/ s, 35 with diffuse backlighting from a 350 W metal halide lamp ͑Sumita LS-M350͒. With the above microscope, the maximum pixel resolution becomes 1.45 m.…”

Section: Experimental Methodsmentioning

confidence: 99%

Spray and microjets produced by focusing a laser pulse into a hemispherical drop

et al. 2009

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Articles you may be interested inJet atomization and cavitation induced by interactions between focused ultrasound and a water surfacea) Phys. Fluids 26, 097105 (2014) We use high-speed video imaging to study laser disruption of the free surface of a hemispheric drop. The drop sits on a glass surface and the Nd:YAG ͑yttrium aluminum garnet͒ laser pulse propagates through the drop and is focused near the free surface from below. We focus on the evolution of the cylindrical liquid sheet and spray which emerges out of the drop and resembles typical impact crowns. The tip of the sheet emerges at velocities over 1 km/s. The tip of the crown breaks up into fine spray some of which is sucked back into the growing cavity at about 100 m/s. We measure the size of the typical spray droplets to be about 3 m. We also show the formation of fine microjets, which are produced when the laser is focused inside the drop and the shock front hits small bubbles sitting under the free surface. For water these microjets are 5 -50 m in diameter and exit at 100-250 m/s. For higher viscosity drops, these jets can emerge at over 500 m/s.

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Section: Experimental Methodsmentioning

confidence: 99%

Spray and microjets produced by focusing a laser pulse into a hemispherical drop

et al. 2009

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“…The impact velocity U is varied by changing the release heights up to 1.6 m. The Reynolds and Weber numbers of the impact are Re = UD ϳ 100 -2000, We = DU 2 ϳ 80 -2400, where the and are the dynamic viscosity and density of the liquid and is the surface tension. These parameter values were selected based on our earlier work with Ootsuka et al 8 To capture the details of the rapid entrapment motions, we use an ultra-high-speed video camera ͑Shimadzu Hypervision, Etoh et al 9 ͒, capable of frame-rates up to 1 ϫ 10 6 fps, while each video sequence consists of 102 frames, containing 260ϫ 312 pixels, irrespective of the frame rate used. The time counter in the accompanying video clips is in microseconds.…”

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Bubble entrapment through topological change

2010

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When a viscous drop impacts onto a solid surface, it entraps a myriad of microbubbles at the interface between liquid and solid. We present direct high-speed video observations of this entrapment. For viscous drops, the tip of the spreading lamella is separated from the surface and levitated on a cushion of air. We show that the primary mechanism for the bubble entrapment is contact between this precursor sheet of liquid with the solid and not air pulled directly through cusps in the contact line. The sheet makes contact with the solid surface, forming a wetted patch, which grows in size, but only entraps a bubble when it meets the advancing contact line. The leading front of this wet patch can also lead to the localized thinning and puncturing of the liquid film producing strong splashing of droplets.

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“…An imaging sensor using the in situ storage image sensor (ISIS) technology that can capture 100 consecutive frames at 1 Mfps with 312 × 260 pixels has been reported. 13 Memory elements were attached to every pixel and image signals were stored in the in situ storage without being read out of the sensor. However, the fill factor was only 13%, and the effective pixel size, too large at 66.3 × 66.3 μm, was not suitable for microscopic observations (pixels too large for required spatial resolution).…”

Section: Introductionmentioning

confidence: 99%

Ultra-fast bright field and fluorescence imaging of the dynamics of micrometer-sized objects

Chen

Wang

Versluis

et al. 2013

Review of Scientific Instruments

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High speed imaging has application in a wide area of industry and scientific research. In medical research, high speed imaging has the potential to reveal insight into mechanisms of action of various therapeutic interventions. Examples include ultrasound assisted thrombolysis, drug delivery, and gene therapy. Visual observation of the ultrasound, microbubble, and biological cell interaction may help the understanding of the dynamic behavior of microbubbles and may eventually lead to better design of such delivery systems. We present the development of a high speed bright field and fluorescence imaging system that incorporates external mechanical waves such as ultrasound. Through collaborative design and contract manufacturing, a high speed imaging system has been successfully developed at the University of Pittsburgh Medical Center. We named the system "UPMC Cam," to refer to the integrated imaging system that includes the multi-frame camera and its unique software control, the customized modular microscope, the customized laser delivery system, its auxiliary ultrasound generator, and the combined ultrasound and optical imaging chamber for in vitro and in vivo observations. This system is capable of imaging microscopic bright field and fluorescence movies at 25 × 10 6 frames per second for 128 frames, with a frame size of 920 × 616 pixels. Example images of microbubble under ultrasound are shown to demonstrate the potential application of the system.

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An image sensor which captures 100 consecutive frames at 1 000 000 frames/s

Cited by 148 publications

References 6 publications

Spray and microjets produced by focusing a laser pulse into a hemispherical drop

Spray and microjets produced by focusing a laser pulse into a hemispherical drop

Bubble entrapment through topological change

Ultra-fast bright field and fluorescence imaging of the dynamics of micrometer-sized objects

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