MICROWAVE MEASUREMENTS ON SHOCK WAVES IN AIR.
HEBREW UNIV JERUSALEM (ISRAEL) DEPT OF PHYSICS
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The microwave attenuation by shock waves in air was investigated in the Mach No. range of 8 - 12 and at pressures 1-5 mm Hg. It is shown that an analysis of the time dependence of the attenuation yields important information regarding a the maximum electron-density b the build-up of the electron density and the beginning of the shock, c the electron density near the contact surface, and d the length of the heated slug section. An investigation was made of the effect of transitions from a larger diameter shock tube to a smaller tube on the maximum microwave attention, on its time dependence, and on the Mach No. In particular, a study was made of the effect of shorter and larger taper sections as well as abrupt transitions for various Mach Numbers and initial pressures. Author