Measurement of Surface Reflection Properties
Markus Müller-Trapet
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Markus Müller-Trapet, Measurement of Surface Reflection Properties (2015), Logos Verlag, Berlin, ISBN: 9783832594565
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Beschreibung / Abstract
In this thesis, acoustic measurement techniques related to the absorbing as well as the scattering properties of architectural surfaces are investigated.
The research is divided into two parts: the first part consists of determining the most relevant causes of uncertainty for the standardized measurement methods of random-incidence absorption and scattering coefficients. A method is developed to determine the necessary minimum number of source-receiver combinations in the reverberation chamber to ensure a specified precision of the absorption or scattering coefficient.
The second part of the thesis focuses on a hemispherical microphone array and signal processing steps related to the measurement of angle-dependent reflection properties. Measurements show that the array setup can be used to obtain the angle-dependent absorbing properties of samples with few source positions. With the help of array signal processing methods, the setup can also be used to determine the directional diffusion and scattering coefficient of small samples, yielding the same result as established far-field methods.
The research is divided into two parts: the first part consists of determining the most relevant causes of uncertainty for the standardized measurement methods of random-incidence absorption and scattering coefficients. A method is developed to determine the necessary minimum number of source-receiver combinations in the reverberation chamber to ensure a specified precision of the absorption or scattering coefficient.
The second part of the thesis focuses on a hemispherical microphone array and signal processing steps related to the measurement of angle-dependent reflection properties. Measurements show that the array setup can be used to obtain the angle-dependent absorbing properties of samples with few source positions. With the help of array signal processing methods, the setup can also be used to determine the directional diffusion and scattering coefficient of small samples, yielding the same result as established far-field methods.
Inhaltsverzeichnis
- BEGINN
- 1 Introduction
- 1.1 Uncertainty Analysis of Reverberation Chamber Measurements
- 1.2 Measurement of Angle-Dependent Reflection Properties
- 2 Fundamentals
- 2.1 Sound Propagation in Free Space
- 2.2 Spherical Wave Spectrum
- 2.3 Sound Reflection at an Extended Planar Surface
- 2.4 Sound Scattering
- 2.5 Room Acoustics
- 2.6 Standardized Measurement Methods
- 2.7 Uncertainty Analysis
- 3 Uncertainty Analysis of Reverberation Chamber Measurements
- 3.1 Average Room Absorption Coefficient
- 3.2 Sample Absorption Coefficient (ISO 354)
- 3.3 Sample Scattering Coefficient (ISO 17497-1)
- 3.4 Preliminary Conclusions
- 4 Measurement of Angle-Dependent Reflection properties
- 4.1 Measurement Setup
- 4.2 Separation of Incident and Reflected Sound
- 4.3 Analysis of Reflected Sound: Reflection Factor
- 4.4 Analysis of Reflected Sound: Spatial Response
- 5 Conclusion and Outlook
- 5.1 Uncertainty Analysis of Reverberation Chamber Measurements
- 5.2 Measurement of Angle-Dependent Reflection Properties
- Acknowledgments
- Bibliography