UNSPECIFIED (1997) A real-time video encoded particle imaging tracking technique for velocity measurement. OPTICS AND LASERS IN ENGINEERING, 27 (6). pp. 621-636. ISSN 0143-8166

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Abstract

A real-time video encoded particle imaging tracking technique (VPIT) for velocity measurement has been developed. It can currently capture images of a seeded particle flow field at up to a video rate of 25 pictures per second. The method as shown in this paper is suitable for measuring a slow sparsely seeded flow. A VPIT image presents a triplet image pattern. The image has been encoded into a single video frame with the time history of three events. This is achieved by synchronising the video (CCIR) signal from a CCD (charge coupled device) camera, operating in frame integration mode with a suitable light source. The principle of VPIT demonstrates how the direction and the magnitude of the velocity can be recorded for a sequence or track of particles. The VPIT triplet images resolve several common difficulties associated with the application of PIV Firstly, the rime history of the laser pulse can be 'labeled' on an individual particle image. Secondly, there is no velocity direction ambiguity in the VPIT image. Thirdly, it is possible to extract the acceleration of the particle from a single VPIT frame. Finally, for a sequence of captured frames, the problems of particle path tracking are simplified, because each VPIT image has a video encoded time sequence 'labelled' on it. (C) 1997 Elsevier Science Ltd.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	OPTICS AND LASERS IN ENGINEERING
Publisher:	ELSEVIER SCI LTD
ISSN:	0143-8166
Date:	August 1997
Volume:	27
Number:	6
Number of Pages:	16
Page Range:	pp. 621-636
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/17575

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