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Formation of Scattering Characteristics for Acoustical Ray Tracing Simulation

Bojičić S., Šumarac-Pavlović D., Mijić M.

Archives of Acoustics

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2018

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Vol. 43, No. 4

657--667

EN

Ray tracing simulation of sound field in rooms is a common tool in room acoustic design for predicting impulse response. There are numerous commercial engineering tools utilising ray tracing simulation. A specific problem in the simulation is the modelling of diffuse reflections when contribution of individual surface is prevailing. The paper introduces modelling of scattering which is interesting when the whole impulse response of a room is not a goal but contribution of certain surface. The main goal of the Project is to shape directivity characteristics of scattered reflection. Also, an innovative approach is suggested for converting the energy histogram information obtained by ray tracing into an “equivalent impulse response”. The proposed algorithm is tested by comparing the results with measurements in a real sound field, realised in a scaled model where a diffusing surface is hardware-implemented.

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Własności optyczne cienkich warstw poliazometyny

Jaglarz J., Szopa P., Cisowski J., Domański M., Burian A.

Prace Naukowe Instytutu Technologii Organicznej i Tworzyw Sztucznych Politechniki Wrocławskiej. Konferencje

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2003

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Vol. 52, nr 25

342-345

PL

Wykonano pomiary odbicia zwierciadlanego i dyfuzyjnego od cienkich warstw poliazometyny naniesionych na podłoża szklane i krzemowe. Warstwy były nanoszone metodą polikondensacji składników wyjściowych. Pomiary odbicia widmowego w zakresie długości fal 350 nm - 860 nm. przeprowadzono za pomocą światłowodowej sondy odbiciowej i sfery całkującej połączonych ze spektrofotometrem PC 2000. Stwierdzono występowanie dużych niejednorodności po grubości w warstwach poliazometynowych otrzymywanych przez naparowanie na podłoża oraz obok silnej absorpcji w zakresie widmowym 350 nm - 500 nm rozpraszanie Rayleigh'a dla fal dłuższych od 600 nm.

EN

Specular and diffusion reflection measurements for thin of polyazomethines on glass and Si substrate have been performed. Measurements of reflection spectra for wavelength in range 350 nm - 860 nm have been made by optical fibre reflection probe and integration sphere. The results obtained in our study have shown differences of thickness for thin films polyazomethines and strong absorption for wave range from 350 nm to 500 nm. Strong Rayleigh diffusion for wavelength longer than 600 nm has been noticed.

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Comparison of diffuse interreflection effect in deterministic and stochastic modified ray-tracing methods

Kurp F., Kmiecik M.

Journal of Applied Computer Science

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1999

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Vol. 7, nr 2

93-107

EN

A method to simulate the diffuse indirect reflection used in most known applications is called radiosity. However radiosity methods sometimes do not give good results when all types of light-matter interaction (scattering, reflecting and refracting) take place at the same time. In the last decade many methods based on the ray-tracing were proposed, to eliminate these errors. The most powerful ones (irradiance caching, path tracing) represent two different approaches: deterministic and stochastic. This paper compares these two methods. The results are analyzed for the time cost and errors produced. We also try to show the way of eliminating these errors with the new semi-stochastic semi-deterministic method.