Measurements of density in flowing air by means of the double-slit interferometer

Abstract

The present report begins with a description of the double-slit interferometer and a derivation of the interferometer formula, Following that the application of the interferometer to measurements of density in flows is discussed and the formula is modified forth is particular purpose, A calibration of the interferometer is essential. The possible sources of error are particularly stressed. The formulae given in this report are applicable to all interferometers. In conclusion measurements of density in a Laval nozzle are discussed. These measurements permit an insight into the accuracy of the measuring method.Peer reviewed: NoNRC publication: Ye