Hearing protector fit-testing: spectrum uncertainty budgets
AbstractHearing protection devices (HPD) are widely used to protect workers exposed to dangerous levels of noise. Their effective attenuation can nowadays be routinely assessed using Field Attenuation Estimation Systems (FAES), colloquially referred to as fit-test systems. FAES typically rely on the Personal Attenuation Rating (PARx%), a single number factoring in the attenuation obtained at the seven octave band frequencies from 125 to 8000 Hz, and accounting for the spectrum uncertainty component resulting from the different attenuation profiles of HPDs across these frequencies. In the current study, this spectrum uncertainty has been computed, for many types of HPDs, from various published laboratory datasets, including the NIOSH Hearing Protector Device Compendium. The study includes a detailed spectrum uncertainty budget for the various categories of earplugs (roll-down foam, premolded, formable, push-to-fit, custom molded, etc.), semi-inserts and earmuffs. These values have been expressed at the 95th percentile for a direct use in the upcoming ANSI S12.71 standard on FAES.
How to Cite
Copyright on articles is held by the author(s). The corresponding author has the right to grant on behalf of all authors and does grant on behalf of all authors, a worldwide exclusive licence (or non-exclusive license for government employees) to the Publishers and its licensees in perpetuity, in all forms, formats and media (whether known now or created in the future)
i) to publish, reproduce, distribute, display and store the Contribution;
ii) to translate the Contribution into other languages, create adaptations, reprints, include within collections and create summaries, extracts and/or, abstracts of the Contribution;
iii) to exploit all subsidiary rights in the Contribution,
iv) to provide the inclusion of electronic links from the Contribution to third party material where-ever it may be located;
v) to licence any third party to do any or all of the above.