发明名称 |
LOW FREQUENCY BROAD BAND ULTRASONIC TRANSDUCERS |
摘要 |
<p>Low frequency pulse-echo ultrasonic transducers are provided especially suited for use in downhole cement bond evaluation, but usable for various applications. One frequency pulse-echo ultrasonic transducer comprises a transducer stack having alternating layers of a piezoceramic element and an ultrasonic attenuating element that is preferably acoustic impedance matched to the piezoceraniic elements in order to reduce the Q of the transducer stack. Another low frequency pulse-echo ultrasonic transducer comprises an assembly having the present transducer stack disposed on an acoustic attenuating backing and a front face. Yet another low frequency pulse-echo ultrasonic transducer comprises a transducer composite made from a lead metaniobate. Still another frequency pulse-echo ultrasonic transducer comprises a composite stack. A further low frequency pulse-echo ultrasonic transducer comprises a composite stack, wherein multiple drive elements allow driving individual elements at different times. The transducers may be driven in a multiple-pulse time delayed manner.</p> |
申请公布号 |
WO2013166129(A4) |
申请公布日期 |
2014.03.13 |
申请号 |
WO2013US39038 |
申请日期 |
2013.05.01 |
申请人 |
PIEZOTECH LLC |
发明人 |
LAUTZENHISER, FRANS;MATAM, MAHESH;MOLZ, ERIC |
分类号 |
E21B47/00;E21B49/00 |
主分类号 |
E21B47/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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