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- W2091941394 abstract "An experimental investigation of the parametric array in air was conducted using a squirter transducer for the sound source. Separate elements of the transducer, excited at frequencies of 18.6 and 23.6 kHz, produced 16.2° and 16.6° primary beams, respectively. Since the source levels were not strong (typically 95–105 dB re 0.0002 μbar), the 5-kHz difference frequency signal generated by the parametric array was relatively weak. Preliminary measurements indicated the presence of spurious difference frequency signals as a result of intermodulation distortion in the receiving system. After the spurious signals were suppressed, by judicious choice of electronic components and by the addition of an acoustic filter in front of the microphone, the classic parametric array properties were observed. The 5-kHz beam was narrow (≃15°) and had no sidelobes; the beam narrowed slightly with increasing range. The propagation curve first increased, reached a broad maximum, and then gradually decreased. Because of space limitations, all measurements were taken in the nearfield of the parametric array. Beam patterns and propagation curves were also measured for the sum frequency and second harmonic signals. Comparison of the measured results with theory conclusively demonstrated the existence of the parametric array in air. [This work was sponsored by AFOSR and by ONR.]" @default.
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- W2091941394 date "1973-07-01" @default.
- W2091941394 modified "2023-09-24" @default.
- W2091941394 title "Experimental Verification of the Parametric Array in Air" @default.
- W2091941394 doi "https://doi.org/10.1121/1.1978119" @default.
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