Reliable detection technology of gas and vapor filled bubbles in fluid media is of paramount importance for many medical and industrial processes. In this work we present an acoustic bubble detection technique. A single element transducer device simultaneously performing as projector and receiver capable of generating well-controlled low frequency standing pressure waves in a resonant acoustic glass chamber. The electrical properties of the transducer reflect changes in the elastic properties of the fluid media due to the presence of bubbles that perturb the resonant state of the acoustic chamber, providing the bubble detection mechanism. This allows the usage of electrical resonance of the transducer as a proxy measurement for determining the mechanical resonance of the chamber. Our results show reproducible detection of a 7.5 mm long and 5.2 mm wide Taylor bubble in the form of a current drop across the transducer. Positive results were also obtained with bubbles of 2 and 0.6 mm in diameter. The device proved to work effectively at low power (<1 Watt) making it highly stable over long operation times. Additionally, by taking advantage of the transducer’s electrical properties as a proxy for the resonant state of the enclosed volume, the operation is non-invasive and adaptable to other geometries.

对于许多医疗和工业过程而言，可靠的检测流体介质中充满气体和蒸气的气泡的技术至关重要。在这项工作中，我们提出了一种声学气泡检测技术。同时用作投影仪和接收器的单元件换能器设备，能够在共振声玻璃腔室中产生受控良好的低频驻压波。换能器的电特性反映了由于气泡的存在而引起的流体介质弹性特性的变化，这些气泡干扰了声腔的共振状态，从而提供了气泡检测机制。这允许将换能器的电谐振用作确定室的机械谐振的替代测量。我们的结果表明，可重复检测到7.5毫米长和5毫米。2 mm宽的泰勒气泡，其形式为通过换能器的电流降。用直径2和0.6毫米的气泡也获得了积极的结果。事实证明，该设备在低功率（<1瓦）下仍能有效工作，从而使其在长时间运行时具有很高的稳定性。另外，通过利用换能器的电学特性来代替封闭体积的共振状态，该操作是非侵入性的，并且适用于其他几何形状。