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143. Simultaneous and Time Series Measurements of Two-Dimensional Velocity and Temperature Fields Using an Image Processing Technique

Author

KEIO UNIV TOKYO (JAPAN), Sakakibara, Jun, Hishida, Koichi, Maeda, Masanobu, KEIO UNIV TOKYO (JAPAN), Sakakibara, Jun, Hishida, Koichi, and Maeda, Masanobu

Abstract

The spatial and simultaneous qualification of velocity and temperature field of flow has been made using image processing for understanding large scale structures of thermal mixing and a time dependent movement of vorticies. The velocity vectors were obtained by the cross-correlation technique which estimates a displacements of particle groups in two pictures of the flow field taken a short interval time, and the velocity vecters are calculated from the displacements dividing the interval time. The temperature measurement was performed by the laser induced fluorescence technique. The radiation of a excited fluorescence is varied with the dye temperature effectively. The temperature is estimated from a relation between the radiation intensity and temperature. The intensity in the thermal field can be measured by a CCD camera without a special optics or image intensifier. The system, with these two techniques, are applied to the natural convection, and presented the spatial and time dependent motion of the voltices. The efficiency of this technique was well confirmed. (Author), This article is from 'International Symposium on Applications of Laser Techniques to Fluid Mechanics and Workshop on Computers in Flow Measurements (6th) Held in Lisbon, Portugal on July 20-23, 1992, AD-A258 510

Published
1992

144. Multi-Purpose High Speed Signal Processor for LDA/PDA Using DSP Array

Author

KEIO UNIV TOKYO (JAPAN), Kobashi, Kazuhiro, Hishida, Koichi, Maeda, Masanobu, KEIO UNIV TOKYO (JAPAN), Kobashi, Kazuhiro, Hishida, Koichi, and Maeda, Masanobu

Abstract

The present paper introduces a modified high-speed digital signal processing system using stand-alone digital signal processor boards. A remarkable acceleration of the operation which is based on the FFT burst analyzer technique has been enabled by the parallel mode calculation. Time series measurements, transient measurement, and local particle size and mass flux measurements are permitted with acceptable accuracy for signals with a lower signal to noise ratio. Thereby, so-called multi-purpose high speed signal processor was developed for LDA/PDA, and confirmed a high performance of real time measurement for 1600 particles per second by six DSPs. (Author), This article is from 'International Symposium on Applications of Laser Techniques to Fluid Mechanics and Workshop on Computers in Flow Measurements (6th) Held in Lisbon, Portugal on July 20-23, 1992', AD-A258 510, p21.6.1-21.6.6.

Published
1992

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