Wire-Type Dispersive Ultrasonic Delay Lines
Wire-Type Dispersive Ultrasonic Delay Lines
复制标题
线型分散超声波延迟线
DOI：
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发表时间：
1960
期刊：
影响因子：
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通讯作者：
J. E. May
中科院分区：
文献类型：
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作者：
J. E. May
描述了利用柱形导线中纵波的色散来提供随频率变化的延迟的超声波延迟线。第一纵模的时延-频率特性中拐点的存在使得时延特性可以近似为线性，或者具有正曲率或负曲率。通过在第二纵模的截止频率以下工作，不需要的响应主要限于弯曲模式。描述了在延迟-频率特性的不同区域中工作的各种设计。描述了一个模型，该模型在中心接近1.5兆周期的14%频带上偏离每兆周期1710微秒的线性延迟斜率±7.5微秒。
Ultrasonic delay lines are described which utilize the dispersion of longitudinal waves in cylindrical wires to provide a delay which is variable with frequency. Existence of an inflection point in the delay-vs-frequency characteristic for the lirst longitudinal mode allows the delay characteristics to be either approximately linear or to havpe ositive or negative curvature. By operating below the cutoff frequency for the second longitudinal mode, the unwanted responses are limited mainly to flexural modes. Various designs are described which operate in different regions of the delay-vs-frequency characteristic. One model is described which departs by ±7.5 microseconds from a linear delay slope of 1710 microseconds per megacycle over a 14 per cent band centered near 1.5 megacycles.