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本文报道了使用螺旋谐振腔技术在压电铌酸锂和石英晶体中直接激发频率低至10MHz的超声波的实验结果.谐振腔壁由一般的黄铜片或印刷电路板制成,腔体呈圆柱状或长方体,其Q值可达500以上.用插入腔体内的单股导线使信号源和谐振腔之间获得较满意的耦合.实验发现,腔体内螺旋线末端若与一块小铜片相联,可提高压电晶体内超声波的激发效率.本文也指出了该技术进一步改进的措施及在材料检测中可能的应用.
This paper reports the experimental results of using helical resonant cavity technique to directly excite ultrasonic waves with frequencies as low as 10MHz in piezoelectric lithium niobate and quartz crystal.The resonant cavity wall is made of general brass sheet or printed circuit board, Shaped or rectangular parallelepiped with a Q of more than 500. A single wire inserted into the cavity is used to make the coupling between the signal source and the resonant cavity more satisfactory.It is found that if the end of the spiral in the cavity is connected with a small piece of copper , Which can improve the excitation efficiency of the ultrasonic wave in the piezoelectric crystal.This paper also pointed out the further improvement measures and the possible applications in the material testing.