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Datasets of high spatial resolution scans of the airborne ultrasound field at the front, back and left side of an ultrasonic welding machine

<p>This dataset contains measuring data which are the result of investigations of the&nbsp;airborne ultrasound field of an ultrasonic welding machine. These investigations have been conducted within the scope of the EMPIR project 15HLT03: &ldquo;Ears II - Metrology for modern hearing assessment and protecting public health from emerging noise sources&rdquo;. In the context of &ldquo;Ears II&rdquo;, they served gaining knowledge for occupational safety and health. Here, the aim was to investigate the structure of&nbsp;the airborne ultrasound field at ultrasound related workplaces. Therefore, a reference workstation was set up in the laboratory of the Physikalisch-Technische Bundesanstalt (PTB). The airborne ultrasound field of a typical industrial source of airborne ultrasound (an ultrasonic welding machine) was measured with a scanning microphone system with a high spatial resolution.</p> <p>The dataset contains data of 6 measurements:</p> <ul> <li>At the back of the ultrasonic welding machine at a vertical surface with dimensions 168 cm x 150 cm (width x height)</li> <li>At the left side of the ultrasonic welding machine at a vertical surface with dimensions&nbsp;168 cm x 150 cm (width x height)</li> <li>At the front of the ultrasonic welding machine at a&nbsp;horizontal surface with dimensions&nbsp;168 cm x 75&nbsp;cm (width x depth)</li> <li>At the front of the ultrasonic welding machine at a vertical surface with dimensions&nbsp;168 cm x 150 cm (width x height) with a distance of 24 cm to the sonotrode</li> <li>At the front of the ultrasonic welding machine at a vertical surface with dimensions&nbsp;168 cm x 150 cm (width x height) with a distance of 99 cm to the sonotrode</li> <li>At the front of the ultrasonic welding machine in a volume with dimensions 58 cm x 33&nbsp;cm x 50&nbsp;cm&nbsp;(width x depth x height)&nbsp;</li> </ul> <p>The measuring data is the square of the absolute value of the discrete Fourier transform of the signal voltage re 1 V²&nbsp;represented in the frequency domain, converted by fast Fourier transform, in the frequency range 0 &ndash; 100 kHz with a frequency resolution&nbsp;of 15.625 Hz. The data can be converted to sound pressure levels (SPL) using the&nbsp;calibration values published as a supplementary dataset.</p>