Ultrasonic noise measurements in the work environment.

In many countries, ultrasonic noise is included in the list of factors harmful to health in the work environment. For the frequency range above 20 kHz, there is no clear and complete information on the factors influencing the result of a measurement of sound pressure level. Moreover, there are no current international standards for performing measurements of ultrasonic noise at work stations. This article presents a possibility for the adaptation of the existing measurement methods [e.g., ISO 9612:2009 (2009)] to the ultrasonic range. In particular, it discusses the requirements for measuring instruments, procedures to be followed while performing measurements, the application of a correction to measurement results, and the determination of measurement uncertainty. The development of a consistent method of ultrasonic noise measurement is of utmost importance in carrying out an assessment and reducing the risk of exposure to this physical factor in the work environment.