Abstract
It is well known that hearing loss can occur from exposure to high intensities of sounds >80 dBA; however there is less information about hearing loss from ultrasonic frequencies. There are many commercial and industrial devices that produce ultrasonic acoustic energy ranging from humidifiers, pest and pet repellent devices, and crowd control devices. Even though there are fewer regulations with regard to ultrasound, there have been documented cases of effects including temporary or permanent threshold shifts from exposure to ultrasonic energy. However, there is not a readily available open source solution for quantifying exposure. In this work, a TYMPAN open source hearing aid development platform is used to develop and test a prototype ultrasonic dosimeter. This dosimeter works like a SPL meter, with the inclusion of the ultrasonic 1/3 octave bands, with an audible alarm emitted when the user happens to be in the presence of ultrasonic energy. From the full data recording of a test covering various environments, several key features of the exposure are highlighted. The presentation will cover the development of the algorithms, testing of the device, and post test analysis. Code will be made available via the open source libraries for future users to build upon.
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