Abstract
Sound waves were detected in a low-pressure gas ionized by a pulsed microwave field. The detection was made by means of a condenser microphone with a damped probe located in the 1 cm glass tube containing the plasma and about 60 cm away from it. The microphone output was monitored on a frequency counter and on a wave or frequency analyser, for frequency and amplitude analysis. The sound wave frequency was equal to the pulsation rate, and its pressure amplitude was dependent on the type, mean pressure and flow condition of the ionized gas, as well as on the incident microwave power. For example, in argon at static condition and at a mean pressure of 27 mm Hg, a sound pressure amplitude of 124 dB was measured. Results of other quantitative measurements in nitrogen and argon are reported.
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