Acoustical and Geometrical Properties of Custom Earplugs Obtained with an Automated Fitting System. Bacon, C., Delnavaz, A., Voix, J., & Jérémie Voix In NHCA Spectrum, 2012.
Acoustical and Geometrical Properties of Custom Earplugs Obtained with an Automated Fitting System [pdf]_pdf_0  Acoustical and Geometrical Properties of Custom Earplugs Obtained with an Automated Fitting System [link]_mendeley  abstract   bibtex   
This presentation will detail the results of some recent studies conducted on a new type of custom earplug instantly fitted to the user's earcanal. This "Sonomax V4" earplug is made of a core body of generic shape, surrounded by a thin expandable silicone envelope. An headset-mounted pump injects a two-part medical silicone compound within the core and the envelope of the earplug so that the earplug expands and fits properly the user's earcanal A precise regulation mechanism within the pump has been developed to ensure that the proper amount of silicone required for the specific user's earcanal shape and dimension is injected each time. The acoustical properties of the obtained earplug will be presented together with the results of a geometrical analysis conducted to assess the consistency and adequacy of the obtained earplug shape.

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