Acoustic attenuation is a reduction of a propagating sound signal beyond that attributed to the specified geometric spreading. Absorption converts acoustic energy to other forms, while scattering redirects it away from the receiving path. The inferred attenuation therefore depends on what the detector collects and how the spreading reference is defined.
For a plane wave with pressure amplitude , the corresponding sound intensity decays as in a fixed medium. An attenuation coefficient defined from intensity has twice the numerical value of this amplitude coefficient. Measuring the signal at several separations can estimate the slope, provided the source response, reflections and geometric corrections are controlled.
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Acoustic attenuation refers to the reduction in the intensity of sound waves as they propagate through a medium. This attenuation can occur due to various factors, including: 1. **Absorption**: When sound waves pass through a material, some of their energy is converted to heat, reducing the sound's intensity. Different materials absorb sound differently, with some exhibiting high attenuation (e.g., soft fabrics) and others exhibiting low attenuation (e.g., concrete).