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Sound intensity

About: Sound intensity is a research topic. Over the lifetime, 4735 publications have been published within this topic receiving 54163 citations. The topic is also known as: sound energy flux density & sound power density.


Papers
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Book
01 Jan 1981
TL;DR: In this article, the basic properties of acoustic wave properties are discussed, including linearization, uniformity, and Fourier analysis of wave properties, as well as the relationship between wave properties.
Abstract: CHAPTER TWO Basic Properties of Acoustic Waves 2.1 Ideal Fluids 2.2 Linearization 2.3 Uniform Fluids 2.4 One-Dimensional Plane Waves Speed of Sound in a Perfect Gas Speed of Sound in Other Fluids Relationships between Acoustic Quantities 2.5 Monochromatic Waves Plane, One-Dimensional Monochromatic Waves Plane, Monochromatic Waves in Three Dimensions Relation between Variables in a Monochromatic Wave Time Averages 2.6 Fourier Analysis Periodic Waveforms —Fourier Series Nonperiodic Functions—Fourier Transform 2.7 Acoustic Energy Energy Density Acoustic Intensity Reference Levels

287 citations

Patent
15 Oct 1987
TL;DR: In this paper, the times of flight of sound waves were used to determine temperature in a gas contained in a long tube which confines sound waves, and corrections for thermal expansion of the tube were easily made.
Abstract: Measurements of the times of flight of sound waves can be used to determine temperature in a gas contained in a long tube which confines sound waves Sound pulses are transmitted and received by a suitable loud speaker attached to one end of the long tube A number of stubs or other discontinuities produce the sound reflections whose times of arrival are measured The time intervals yield average sound speeds in each interval between any two stubs from which temperatures are calculated Corrections for thermal expansion of the tube are easily made

272 citations

Journal ArticleDOI
TL;DR: It is shown that a combination of measurements and modeling is necessary to enable accurate characterization of HIFU fields and underrepresentation was attributed mainly to the limited hydrophone bandwidth of 100 MHz.
Abstract: Acoustic characterization of high intensity focused ultrasound (HIFU) fields is important both for the accurate prediction of ultrasound induced bioeffects in tissues and for the development of regulatory standards for clinical HIFU devices. In this paper, a method to determine HIFU field parameters at and around the focus is proposed. Nonlinear pressure waveforms were measured and modeled in water and in a tissue-mimicking gel phantom for a 2 MHz transducer with an aperture and focal length of 4.4 cm. Measurements were performed with a fiber optic probe hydrophone at intensity levels up to 24,000 W/cm(2). The inputs to a Khokhlov-Zabolotskaya-Kuznetsov-type numerical model were determined based on experimental low amplitude beam plots. Strongly asymmetric waveforms with peak positive pressures up to 80 MPa and peak negative pressures up to 15 MPa were obtained both numerically and experimentally. Numerical simulations and experimental measurements agreed well; however, when steep shocks were present in the waveform at focal intensity levels higher than 6000 W/cm(2), lower values of the peak positive pressure were observed in the measured waveforms. This underrepresentation was attributed mainly to the limited hydrophone bandwidth of 100 MHz. It is shown that a combination of measurements and modeling is necessary to enable accurate characterization of HIFU fields.

268 citations

Proceedings ArticleDOI
13 May 2002
TL;DR: Spherical harmonics analysis is used to establish theory and design of a higher order recording system, which comprises an array of small microphones arranged in a spherical configuration and associated signal processing, which has implications to the advancement of future sound field reconstruction systems.
Abstract: A major problem in sound field reconstruction systems is how to record the higher order (> 1) harmonic components of a given sound field. Spherical harmonics analysis is used to establish theory and design of a higher order recording system, which comprises an array of small microphones arranged in a spherical configuration and associated signal processing. This result has implications to the advancement of future sound field reconstruction systems. An example of a third order system for operation over a 10∶1 frequency range of 340 Hz to 3.4 kHz is given.

252 citations

Journal ArticleDOI
TL;DR: In this article, listeners heard equivalent approaching and receding sounds and indicated perceived starting and stopping points of the auditory motion, indicating that the source is closer than it actually is, providing a better opportunity for the listener to prepare for the source's arrival.
Abstract: Rising acoustic intensity can indicate movement of a sound source toward a listener. Perceptual overestimation of intensity change could provide a selective advantage by indicating that the source is closer than it actually is, providing a better opportunity for the listener to prepare for the source's arrival. In Experiment 1, listeners heard equivalent rising and falling level sounds and indicated whether one demonstrated a greater change in loudness than the other. In 2 subsequent experiments listeners heard equivalent approaching and receding sounds and indicated perceived starting and stopping points of the auditory motion. Results indicate that rising intensity changed in loudness more than equivalent falling intensity, and approaching sounds were perceived as starting and stopping closer than equidistant receding sounds. Both effects were greater for tones than for noise. Evidence is presented that suggests that an asymmetry in the neural coding of egocentric auditory motion is an adaptation that p...

251 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202331
202258
202178
2020102
2019121
2018135