Compressible gas density measurement by means of Fourier analysis of interferograms

Janusz Telega; Ryszard Szwaba; Małgorzata Śmiałek-Telega

doi:10.1016/j.measurement.2021.110458

Compressible gas density measurement by means of Fourier analysis of interferograms

Abstract

This paper describes a method for nonintrusive compressible gas density measurement by means of automated analysis of interferograms using FFT (Fast Fourier Transform), and its implementation using DFT (Discrete Fourier Transform), that does make this measurement technique a fairly valuable and accessible experimental method. The presented approach makes it possible to use the finite fringe setting of the interferometer, thus reducing adjustment time. In the process of analysis, the errors originating from the imperfections of optical elements are reduced, and a digital image of a virtual infinite setting of the instrument is generated. As described here, the method is extremely beneficial, but not limited to, flows with shock wave – boundary layer interactions. A result of density measured for a flow with shock wave is presented.

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Articles

Type:

artykuły w czasopismach

Published in:

MEASUREMENT no. 189,
ISSN: 0263-2241

Language:

English

Publication year:

2022

Bibliographic description:

Telega J., Szwaba R., Śmiałek-Telega M.: Compressible gas density measurement by means of Fourier analysis of interferograms// MEASUREMENT -Vol. 189, (2022), s.110458-

DOI: