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超声探伤中能够改善仪器性能与提高检测可靠性的聚焦换能器,引起了很大的关注。按菲涅尔带板原理所工作的换能器较简单结构的换能器的聚焦性能要好。用于超声检测和声观察的带状聚焦换能器的制作方法是众所周知的。在第一种情况下,菲涅尔压电片的偶数带和奇数带的极地方向是
Ultrasound flaw detection can improve the performance of the instrument and improve the reliability of the focus of the transducer, aroused great concern. According to Fresnel strip plate principle of the transducer is better than the simple structure of the transducer focusing performance is better. Methods of making ribbon focusing transducers for ultrasound detection and acoustic observations are well known. In the first case, the polar directions of the even-numbered bands and the odd-numbered bands of the Fresnel piezoelectric sheet are