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    • 9. 发明授权
    • Acoustic holography process and apparatus using a space-limited
ultrasonic beam
    • 使用空间有限的超声波束的声全息技术和装置
    • US4631965A
    • 1986-12-30
    • US602367
    • 1984-04-20
    • Daniel De VadderRobert Saglio
    • Daniel De VadderRobert Saglio
    • G03H3/00G01N29/06G01S15/89G01N29/04
    • G01N29/0663G01N29/069G01S15/897G03H3/00
    • The fault-containing area to be inspected is insonified by means of an ultrasonic transducer with a space-limited beam which is displaced in stepwise manner, the signals coming from the successively insonified areas being detected by several receivers, the phases and amplitudes of the signals being determined and the reconstitution of the area to be inspected performed. There is a main image of the fault and also parasitic images thereof. The number of receivers is chosen in such a way that the distance between the parasitic images and the main image exceeds the width of the area insonified by the transmitter and the reconstitution is only carried out in the insonified areas having given rise to a signal in order to eliminate the parasitic images. Application to the non-destructive inspection of mechanical parts.
    • 要检查的含故障区域通过具有间隔偏移的空间受限的束的超声波换能器来进行增强,这些超声波换能器以逐步的方式移位,来自连续增强区域的信号由几个接收器检测,信号的相位和幅度 被确定并重新组建待检查的地区。 存在故障的主要图像以及其寄生图像。 接收机的数量被选择为使得寄生图像和主图像之间的距离超过由发射机增强的区域的宽度,并且重建仅在已经产生信号的补音区域中进行 以消除寄生图像。 应用于机械零件的无损检测。