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Title: $Multipass holographic interferometry for low-density gas flow analysis
Abstract: Holographic interferometry is a well known method currently used for supersonic gas flow analysis. However, its sensitivity is not high enough to measure low density gas flow, such as those existing in the hypersonic domain. In order to increase the sensitivity, a versatile multipass set-up has been built. Three different methods for selecting a given light pass number, through the wind tunnel test section, have been investigated thanks to a few modifications of the optical set-up. The proposed paper will describe the holographic set-up and the three techniques for passage number selection of the test beam through the studied phenomenon. The results obtained both in laboratory and in a low pressure wind tunnel will be presented.