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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >A swept frequency multiplication technique for air-coupled ultrasonic NDE
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A swept frequency multiplication technique for air-coupled ultrasonic NDE

机译：空气耦合超声无损检测的扫频倍频技术

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摘要

A new technique has been investigated for improving the signals that can be obtained in air-coupled nondestruction evaluation (NDE). This relies on the wide bandwidth available from polymer-filmed capacitive transducers. The technique relies on a swept-frequency "chirp" signal, which is transmitted from a transducer in air. The new technique differs from existing time-domain correlation techniques, such as pulse compression, in that a single multiplication process is performed in the time domain to give a difference frequency signal. This then can be isolated easily in the frequency domain. It will be demonstrated that this new swept frequency multiplication (SFM) approach gives the potential for rapid air-coupled imaging.
机译：已经研究了一种新技术，用于改善在空气耦合无损评估（NDE）中可以获得的信号。这依赖于聚合物薄膜电容式换能器的宽带宽。该技术依赖于扫频“ chi”信号，该信号从空气中的换能器发送。新技术与现有的时域相关技术（例如脉冲压缩）的不同之处在于，在时域中执行了一个乘法处理，以给出一个差分频率信号。这样就可以轻松地将其隔离在频域中。将证明这种新的扫频倍增（SFM）方法为快速空气耦合成像提供了潜力。

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