Modeling of a corona discharge microphone

Philippe Béquin 1 Vincent Joly 1 Philippe Herzog 2
2 Sons
LMA - Laboratoire de Mécanique et d'Acoustique [Marseille]
Abstract : The acoustic pressure sensor described in this paper uses a small volume of ionized gas (plasma) as sensing element to receive energy from surrounding gas (air) set into oscillations by an acoustic disturbance. The generation of the ionized gas is performed by negative point-to-plane corona discharges. The passage of a pressure disturbance through this gas disturbs the flow of the charged particles between the electrodes, and provokes a current variation of the electrical system. This current variation is directly related to the acoustic pressure. An electroacoustic model of this plasma microphone is proposed. From the current-voltage relation associated with corona discharges, this model is based on the variations of the threshold voltage and the mobility of ions with pressure and temperature of the surrounding gas. An experimental setup is developed, it simultaneously allows one to compare the acoustic pressure deduced from the corona discharge sensor with that resulting from the two-microphone method in a standing wave tube. This paper also proposes a parametric study to quantify the influence of the electrical and geometrical parameters of the discharge on the sensitivity of the plasma microphone.
Type de document :
Article dans une revue
Journal of Physics D: Applied Physics, IOP Publishing, 2013, 46 (17), pp.175204. <10.1088/0022-3727/46/17/175204>
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Contributeur : Philippe Herzog <>
Soumis le : vendredi 8 novembre 2013 - 17:47:33
Dernière modification le : lundi 13 octobre 2014 - 15:43:25



Philippe Béquin, Vincent Joly, Philippe Herzog. Modeling of a corona discharge microphone. Journal of Physics D: Applied Physics, IOP Publishing, 2013, 46 (17), pp.175204. <10.1088/0022-3727/46/17/175204>. <hal-00881701>



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