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- W4240225614 endingPage "1972" @default.
- W4240225614 startingPage "1972" @default.
- W4240225614 abstract "The directivity pattern and source level of a large, cylindrical transducer were computed by using Kirchhoff's formula with a simple approximation for the normal pressure gradient. The integration was performed numerically over a finite cylinder. Near-field pressure amplitude and phase measurements were made over the surface of integration by rotating the transducer and measuring the output of a line hydrophone less than 1 wavelength from the active face. The measurements were made on the leading edge of the received pulses—before steady-state conditions were reached. This was done to simulate this transducer operating in a tank of diameter only about twice that of the transducer. Under such conditions, interference due to tank-wall reflections would begin when the amplitude of the pulse envelope was as much as 2–3 dB below the steady-state level. Computed directivity patterns agreed well with equivalent measured ones, but, naturally, computed source levels were 2–3 dB low. A correction term was derived from the first portion of the pulse risetime curves, and was applied to the source-level values to give good agreement with measured ones. The present results indicate that accurate transducer calibration can be obtained in reflective tanks considerably smaller than those used in previous work." @default.
- W4240225614 created "2022-05-12" @default.
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- W4240225614 date "1962-12-01" @default.
- W4240225614 modified "2023-09-26" @default.
- W4240225614 title "Computation of Far‐Field Characteristics of a Transducer from Near‐Field Measurements Made in a Reflective Tank" @default.
- W4240225614 doi "https://doi.org/10.1121/1.1936959" @default.
- W4240225614 hasPublicationYear "1962" @default.
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