Abstract
We present a new method for generating a 4 to 25 ms high power acoustic harmonic bursts, reaching more than 110 dB Sound Pressure Level (SPL), from the spherical Helmholtz resonators. The method uses Q-switched Nd:YAG laser pulses (wavelength = 1064 nm, pulse width = 6 ns, and energy = 450 mJ) to induce plasma shocks inside an AISI 316L stainless steel cavity. The confined plasma shock produces an acoustic burst of temporal standing waves which are characterized by a wide harmonic bandwidth. The frequency response of the system depends on the geometry of the used Helmholtz resonator as well as the laser wavelength (with constant laser pulse duration and fluence). The experiments reveal the dependence of the odd/even harmonic on laser wavelength. This method is a prospective alternative for the dodecahedron loudspeakers, other sources in ISO and standard audio tests.
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Ayoub, H.S., El-Sherif, A.F., Ibrahim, D. et al. Generation of custom acoustic harmonic bursts from spherical helmholtz resonators using Q-switched Nd:YAG laser induced plasma. Opt Quant Electron 53, 525 (2021). https://doi.org/10.1007/s11082-021-03187-1
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DOI: https://doi.org/10.1007/s11082-021-03187-1