Abstract
A modified Michelson interferometer operating in the infinite-fringe mode and using a Helium-Neon laser light source has been used to measure transient density in the unburnt gas region of a spherical combustion bomb during laminar flame propagation. With careful calibration it yields results with an experimental error less than 1%. The method has been successfully used to check the validity of the assumption of adiabatic behaviour of the unburnt gas. It may also be applied to other systems requiring fast response density and temperature measurement, the latter necessitating a simultaneous record of transient pressure.
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