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- W4238206824 abstract "A siren has been constructed which has a useful frequency range from 3 to 33 kilocycles. Preliminary measurements indicate a relatively uniform power output of 125 watts and an efficiency of approximately 30 percent. It consists essentially of a small chamber from which air escapes through 100 orifices, shaped as conical horns, and equally spaced on a six-inch circle. The air flow (60 cu ft./min.) is interrupted by a rotor with 100 teeth driven by a 12 hp high speed motor integral with the siren. The unit is small (712 in. diameter, 1112 in. high) and easily portable. In operation it acts as a ring source with a directivity pattern closely duplicating that expected theoretically. The maximum over-all intensity in the central lobe, 8 cm from the siren, exceeds 160 db relative to .0002 dyne/cm2. The parasitic audible noise is at least 40 db below the signal intensity. Interesting phenomena associated with the intense sound field will be described." @default.
- W4238206824 created "2022-05-12" @default.
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- W4238206824 date "1947-07-01" @default.
- W4238206824 modified "2023-09-23" @default.
- W4238206824 title "High Frequency Siren" @default.
- W4238206824 doi "https://doi.org/10.1121/1.1916594" @default.
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