Figure 6
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Sound Pressure Level measured with a microplasma microphone (d = 100 μm) and a reference microphone for two voltages VL applied to the loudspeakers. Magnitude in dB SPL: 20 log(Pmic/Pref) with Pref = 20 × 10−6 Pa. Operating point of the discharge: Ud ≃ 680 V, I ≃ 70 μA. Fitted sensitivities: Sp2V ≃ 0.46 × 10−9 A/Pa and Sp3V ≃ 0.5 10−6 A/Pa.
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