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Initial evaluation of a portable ultrasound exposimeter for occupational health monitoring

For many years, exposure to airborne ultrasonic noise has been associated with negative consequences for one's well-being. With the increasing number of industrial processes utilizing ultrasonic equipment it has become necessary - and sometimes required by national law - to monitor workers' ultrasound exposure at their workplace. These requirements highlighted the limitations of methodology and equipment employed for industrial ultrasound measurements. In this article, the prototype of a high-frequency audible and ultrasound personal exposimeter is presented. The device was designed to conform to the international standards regulating the high-frequency and ultrasonic noise measurements for occupational health monitoring. Portability of the device, which may be required to be worn throughout an entire work day (e.g. 8 hours), was also considered at the design stage. The prototype is currently tested in a laboratory environment in order to assess its sound level detection capabilities in both audible high-frequency as well as ultrasonic spectrum. Each experimental scenario is initially surveyed with an ultrasound level meter, and then with the new prototype. Results obtained in this manner are then compared. Initial evaluation shows a reasonable agreement between sound measurement capabilities of the two devices.