Abstract
The use of ultrasonic energy has created versatile possibilities of their
applications in many areas of life, especially in hydro location and
underwater telecommunications, industry and medicine. The consequence of a
widespread use of high intensity ultrasonics in technology is the
increased number of people who are exposed to such ultrasonic noise.
Therefore it is important to determine the types of machines and other
devices that are responsible for the emission of ultrasonic noise (10-40
kHz of central frequencies of one-third octave bands) as harmful and
annoying hazard in the work environment. This paper presents ultrasonic
noise sources frequently used in industry and preventive measures reducing
the exposure to ultrasonic noise. Two types of ultrasonic noise sources
have been distinguished: machines and other devices used to carry out or
improve production processes, the so-called technological sources and
sources in which ultrasonic noise exists as a non-intentional result of
operation of many machines and systems, the so-called non-technological
sources of ultrasonic noise. The emission of SPL has been determined for
each groups of devices based on own measurement results.
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