An Analytical Model for Bandwidth Enhancement of Air-Coupled Unsealed Helmholtz Structural CMUTs

<table class="fixed-width table-group" id="tab6"><tr><td><table class="table"><colgroup><col style="width:4.19em"/><col style="width:6.13em"/><col style="width:6.77em"/><col style="width:4.91em"/></colgroup><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left"> </td><td class="align_center">Double case</td><td class="align_center">Standard case</td><td class="align_center">Half case</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left"><i>h</i>/2<i><i>σ</i></i><sub><i>visc</i></sub></td><td class="align_center">3.94</td><td class="align_center">2.79</td><td class="align_center">1.97</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Ratio of cavity height to 2<i><i>σ</i></i><sub><i>visc</i></sub>, taking <i>f</i> as <i>f</i><sub><i>p</i></sub> in (<a href="https://static.hindawi.com/articles/js/volume-2019/3896965/figures/#EEq6" target="_blank">6</a>).</div>

Journal of Sensors

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Table 6

Table 6: An Analytical Model for Bandwidth Enhancement of Air-Coupled Unsealed Helmholtz Structural CMUTs 