The Use of Infrared Absorption to Determine Density of Liquid Hydrogen
Infrared absorption has found applications in both qualitative and quantitative analyses of chemical mixtures and solutions. The dependence of the infrared absorption of liquids and gases upon the density of the fluid has been recognized from the beginning of spectroscopic work. The simpler direct methods of determining density in most applications, however, have delayed the development of a densitometer based on infrared absorption. The special problem of determining the density of flowing liquid hydrogen during a rocket flight suggested that the feasibility of using infrared absorption for this application should be investigated.
KeywordsInfrared Absorption Rotational Transition Liquid Hydrogen Readout Circuit Pressure Buildup
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- 6.H. D. Unland, M.S. Thesis, University of Colorado, Boulder, Colorado (1966).Google Scholar