TOMOGRAPHIC HIGH-SPEED DIGITAL HOLOGRAPHIC-INTERFEROMETRY

A dual-reference beam, plane-wave illumination, holographic interferom etry set-up has been developed which can operate in a rapid double-pul se mode and which provides multiple simultaneous views of a compressib le flow field. it is intended for the quantitative study of the instan taneous density distribution in a 3D (turbulent) flow field, as well a s for the study of density changes that take place in a compressible t urbulent flow in very short time intervals (1-800 mu s). Preliminary r esults were obtained for a compressible free jet flow and for an oscil lating Row from a pipe-collar nozzle.