Attempted Microwave Measurement of Temperature of a Shock‐Heated Plasma

Microwave noise radiation offers a simple probeless way of measuring the electron temperature of a hot plasma. The main difficulty usually lies in giving a true value to the emissivity. The temperature of the equilibrium region behind shocks in argon has been determined from the measurement of the m...

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Bibliographic Details
Published in:The Physics of fluids (1958) 1967-07, Vol.10 (7), p.1468-1476
Main Authors: Aro, T. O., Walsh, D.
Format: Article
Language:English
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Summary:Microwave noise radiation offers a simple probeless way of measuring the electron temperature of a hot plasma. The main difficulty usually lies in giving a true value to the emissivity. The temperature of the equilibrium region behind shocks in argon has been determined from the measurement of the microwave noise emitted by the shock‐ionized argon in a shock tube and the absorption coefficient of the ionized gas measured at the same frequency, 9.05 GHz. The range of Mach numbers, 6.8 to 10.5, of shock in argon at an initial pressure of 4 mm Hg have been investigated experimentally and theoretically, and the smaller range of Mach numbers, 7.3 to 8.2, in which the measurements agree with theory is indicated. The measured temperatures in the latter range were between 4700 and 6000 °K. Difficulties in interpreting some features of the results are discussed.
ISSN:0031-9171
2163-4998
DOI:10.1063/1.1762307