A detailed theoretical analysis of the operation of thermocouple probes used to determine absolute sound levels or acoustic absorption coefficients is presented. The probe consists of a thermocouple imbedded in a sound absorbing medium which closely matches in density and sound velocity the medium in which the sound level is to be determined. In use the transducer which generates the acoustic f...

It is a deceptively simple question to ask how acoustic disturbances propagate in a non–homogeneous flowing fluid. If the fluid is barotropic and inviscid, and the flow is irrotational (though it may have an arbitrary time dependence), then the equation of motion for the velocity potential describing a sound wave can be put in the (3+ 1)–dimensional form ∆ψ ≡ ∂μ ( √−g g ∂νψ) / √−g = 0. The acou...

The comparative analysis of own experimental researches of accuracy and mechanisms of orientation in acoustic space of the Black Sea bottlenose dolphins, north fur seals and dogs were accomplished depending on parameters and environment of sound distribution. From all of the probed representatives of marine mammals dolphins differ the most exact indexes of sound source localization (1.5-2o). Fu...

Acoustic travel-time tomography of the atmosphere is a nonlinear inverse problem which attempts to reconstruct temperature and wind velocity fields in the atmospheric surface layer using the dependence of sound speed on temperature and wind velocity fields along the propagation path. This paper presents a statistical-based acoustic travel-time tomography algorithm based on dual state-parameter ...

An intelligent audio system for sound design using artificial intelligence techniques is reported. The system is used to analyse acoustic recordings, extract salient sound features and to process them to generate parameters for sound synthesis, in a manner that mimics human audio experts. Preliminary tests show that the use of the system reduces design time and yet the quality of the resulting ...

The advantage of using the normal component of the particle velocity rather than the sound pressure in the hologram plane as the input of conventional spatial Fourier transform based near field acoustic holography (NAH) and also as the input of the statistically optimized variant of NAH has recently been demonstrated. This paper examines whether there might be a similar advantage in using the p...

Compared to other medical breast imaging techniques, ultrasonic imaging is more attractive due to its relatively low cost and wide clinical use. This study is concerned with clinical amplitude/velocity reconstruction imaging (CARI) ultrasonography for accurately detecting breast cancer using two acoustic properties: the sound speed and the attenuation. Bioacoustic modeling is used to describe u...

the dependence of some thermodynamic properties of spin-polarized liquid 3he such as velocity of sound, adiabatic index, isentropic compressibility and temperature on the spin polarization has been investigated along different isentropic paths. the lennard-jones potential has been used in our calculations. it has been found that for higher values of entropy, the spin polarization has greater ef...

So far, Brillouin scattering based sensors have been studied as promising technology for a distributed temperature or strain measurement in structural health monitoring [1-10]. Intrinsically, Brillouin scattering is an effect caused by acoustic vibrations in the medium when laser light travels in a medium such as an optical fiber. Since the sound wave is traveling, light is also subjected to a ...