Computer-controlled ultra-high-speed video camera system

1995 ◽  
Author(s):  
Boleslaw Stasicki ◽  
G. E. A. Meier
Keyword(s):  
High Speed ◽  
Video Camera ◽  
Camera System ◽  
High Speed Video ◽  
Ultra High Speed ◽  
High Speed Video Camera ◽  
Computer Controlled ◽  
Video Camera System

Vibration Characteristics of Magnetic Fluid Droplet Adsorbed to Magnetized Needlepoint in Alternating Magnetic Field

2012 ◽  
Vol 721 ◽  
pp. 108-113
Author(s):  
Sota Inomata ◽  
Seiichi Sudo ◽  
Hidemasa Takana ◽  
Hideya Nishiyama
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetic Fluid ◽  
High Speed ◽  
Video Camera ◽  
Alternating Magnetic Field ◽  
Camera System ◽  
High Speed Video ◽  
High Speed Video Camera ◽  
Video Camera System

The dynamic behavior of a magnetic fluid droplet adsorbed to magnetized needlepoint in alternating magnetic field was studied with a high speed video camera system. The directions of alternating magnetic field were parallel and opposite to static magnetic field of magnetized needlepoint. It was found that the surface of magnetic fluid droplet responds to the external magnetic field in elongation and contraction. The frequency of magnetic fluid droplet oscillation was exactly same of the external magnetic field. The shape and instability oscillations of the magnetic fluid droplet were revealed experimentally.

Measurement of Spraying Particle Behaviors by Three-Intensified-Sensor Color High Speed Video Camera System

1998 ◽  
Author(s):  
M. Yamakawa ◽  
S. Oki ◽  
S. Gohda
Keyword(s):  
High Speed ◽  
Optical Filter ◽  
Video Camera ◽  
Image Sensors ◽  
Camera System ◽  
Spray Coatings ◽  
High Speed Video ◽  
Simultaneous Measurements ◽  
High Speed Video Camera ◽  
Video Camera System

Abstract Three-intensified-sensor color high speed video camera system with a cubic three-way beam-split prism and three optical filter holders has been developed. One of three image sensors can be assigned for the measurement of velocity and the others for that of temperature. Simultaneous measurements of temperature and velocity of sprayed particles are tried with this camera for understanding of the formation mechanism of spray coatings. The possibility of measuring the velocity of individual particle in plasma spraying is discussed for behavior analysis of sprayed particles with three-intensified- sensor color high speed video camera system. Furthermore the possibility for simultaneous measurements of temperature and velocity of individual sprayed particles is examined.

Measurement of RBC Velocities in the Rat Pial Arteries with an Image-Intensified High-Speed Video Camera System

1998 ◽  
Vol 56 (3) ◽  
pp. 166-172 ◽  
Author(s):  
Mami Ishikawa ◽  
Eiichi Sekizuka ◽  
Katsuyoshi Shimizu ◽  
Noriyuki Yamaguchi ◽  
Takeshi Kawase
Keyword(s):  
High Speed ◽  
Video Camera ◽  
Pial Arteries ◽  
Camera System ◽  
High Speed Video ◽  
High Speed Video Camera ◽  
Video Camera System

Newly Developed Two-Tip Optical-Fiber Probe for Accurate Measurement of High-Speed Micro-Droplets: Simultaneous Measurement of Their Velocities and Diameters

2009 ◽  
Author(s):  
Keisuke Matsuda ◽  
Yusuke Ozawa ◽  
Takayuki Saito
Keyword(s):  
Optical Fiber ◽  
High Velocity ◽  
High Speed ◽  
Video Camera ◽  
Medium Size ◽  
Fiber Probe ◽  
Optical Fiber Probe ◽  
High Speed Video ◽  
Ultra High Speed ◽  
High Speed Video Camera

Optical fiber probing is very useful and reliable for bubbles/droplets measurement particularly in the gas-liquid two-phase flows that have dense dispersed phase and are impossible to be measured via usual visualization techniques. For the practical purpose of small- or medium-size bubbles/droplets measurement, one of the authors successfully developed a Four-Tip Optical-fiber Probe (F-TOP) and reported their excellent performance in industrial uses. Recently, particular demands for measuring properties of micro bubbles/droplets have increased in researches on multi-phase flows. However, no one succeeded in simultaneously measuring diameters and velocities of high-speed micro-droplets (velocity > 50 m/s; 50 μm < diameter < 500 μm). We made a challenge of measuring such tiny droplets via newly developed optical fiber probe equipped with two tips (Two-Tip Optical-fiber Probe: T-TOP). We have succeeded in this difficult measurement with it. Each optical fiber probe composing the T-TOP is made of a silica optical fiber (125 μm in external diameter, 50 μm in core diameter, 37.5 μm in clad thickness). The optical fiber was fine-drawn using a micro pipette puller, and this yielded a sub-μm-scale tip. The interval of the fiber axes and the gap of the tips were arranged depending on the droplets diameter range. In this paper, we demonstrate the performance of the T-TOP. First, we confirm its practicality in industrial use. The strength of the T-TOP is confirmed by exposure test of high-velocity and high-temperature steam flows. Second, we consider the influence of the flow on the measurement of T-TOP; the optical noise due to probe vibration by the high-velocity gas flow around the T-TOP is considered. Next, we confirm its performance using an orifice-type nozzle (300 μm < droplets diameter < 500 μm; droplets velocities < 40 m/s). We confirm the performance of the T-TOP; the results of T-TOP are compared with those of the visualization of the droplets by using an ultra-high-speed video camera. At the same time, we consider the process of droplet contact with the T-TOP via visualization of ultra-high-speed video camera.

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