Abstract
ABSTRACT A new double-diferential method based on holographic interferometry in real time with references fringes for the determination of gas parameters in cylindrical tubesis presented. By studying the interferograms one gets a graphical recording of the radial distribution of the refraction index of the gas in any region of the tube at a given time, as well as their axial distribution. 2. INTRODUCTION In holographic interferometry the phase object is compared with a holographicimage, or two holographic images are compared to each other [1+4]. The result is a number of interferograms. By studying these interferograms it is possible to determine the distribution of the refraction index of phase objects [58]. In the case of phase objects with cylindrical symmetry different methods are used for solving the Abel integral [9+11]. In this paper is presented a method for the determination of gas refraction index distribution in cylindrical tubes by means of the holographic interferometry inreal time with reference fringes. This method is based on measurement of fringesposition. The method was used for the determination of parameters in cylindric gasdischarge tubes [12].Determining interference fringes new position finally results in determining the
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