The present application relates to the field of
sound field measurement of medical ultrasonic
diagnostic equipment, and particularly relates to a sound
mask for limiting square area
sound power measurement and a preparation method thereof. The sound
mask comprises: a first absorbing layer, a reflecting layer, an intermediate layer and a second absorbing layer which are sequentially stacked from top to bottom; the reflecting layer is located at the
central region of the first absorbing layer, the intermediate layer and the second absorbing layer, and a square sound transmission hole penetrating through the thickness of the reflecting layer is formed on the reflecting layer; the first absorbing layer, the reflecting layer, the intermediate layer and the second absorbing layer are tightly adhered through a pouring process to form an integral plate structure. The present application reasonably arranges the
mask structure of the sound mask by establishing a theoretical model of
sound wave vertical incidence multi-layer medium, so that the sound beam can be constrained, and the performance of the sound mask can strictly meet the technical requirements of the
industry standard YY / T1084-2015.