Urethane potting of acoustic transducers for acoustic travel-time current meters
Urethane potting of acoustic transducers for acoustic travel-time current meters
复制标题
用于声学走时电流计的声学换能器的聚氨酯灌封
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
F. Thwaites
中科院分区：
文献类型：
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作者：
A. Williams;F. Thwaites
压电陶瓷声换能器被电激励以引起尺寸变化，该尺寸变化可以产生压力/位移波。这就是传输功能。压电陶瓷换能器中的应变变化产生电压，并且这种应变变化是换能器上的声压/位移应力的结果，使其成为接收器。为了在发射和接收中工作，换能器的电极需要电绝缘，但压力暴露。浸入绝缘流体如油（通常使用蓖麻油）中可以绝缘，但将换能器暴露于压力，但仍然需要油和水之间的窗口（假设换能器浸没在水中工作）。将换能器浸入绝缘固体中解决了窗口问题。有两种常见的材料可以提供这种绝缘固体：环氧树脂和聚氨酯。本文将列举这些作者的经验，这两种塑料，特别是聚氨酯。
Piezo-ceramic acoustic transducers are electrically excited to cause dimensional changes that can generate a pressure/displacement wave. This is the transmit function. Changes in strain in the piezo-ceramic transducer generate a voltage and such changes in strain are the result of acoustic pressure/displacement stress on the transducer making it a receiver. To work in transmit and receive the electrodes of the transducer need to be electrically insulated yet pressure exposed. Immersion in an insulating fluid such as oil (castor oil is often used) can insulate yet expose the transducer to pressure but a window between the oil and the water (assuming the transducer is to work submerged in water) is still needed. Immersion of the transducer in an insulating solid solves the window problem. And there are two common materials that provide this insulating solid: epoxy and polyurethane. This paper will enumerate the experiences these authors have had with these two plastics but especially urethane.