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    • 9. 发明授权
    • Method and device for transmitting and receiving electro-magnetic
ultrasound
    • 发送和接收电磁超声的方法和装置
    • US4420978A
    • 1983-12-20
    • US251888
    • 1981-04-07
    • Thomas RobinsonWilly Ohlsson
    • Thomas RobinsonWilly Ohlsson
    • G01N29/22G01N29/04G01N29/24G01S7/524
    • G01N29/2412G01S7/524G01N2291/0234G01N2291/02827
    • A method at the transmission and reception of electromagnetically generated and received pulses of ultrasound, especially at non-destructive testing of electrically conductive material.The method comprises the steps of in a transmitter generating a first magnetic field by means of a first coil and a magnet core and supplying a transmitter coil located in the first magnetic field with a transmission pulse of ultrasonic frequency, and in a receiver generating a second magnetic field by means of a second coil and magnet core and by means of a receiver coil located in the second magnetic field receiving a signal originating from said transmitted pulse. When testing in this way nonmagnetic material, the signal/noise ratio is low. The noise partially originates from generated ultrasound affecting the transmitter and receiver magnets.According to the invention, a first transmission pulse is caused to be transmitted and received while the current in said first coil (1) and said second coil (2) has the same or different direction, whereafter the received signal is stored in a memory (8) intended therefor, whereafter a second transmission pulse is caused to be transmitted and received while the current in said first coil (1) or said second coil (2) has reversed direction compared with the condition when the first transmission pulse was transmitted and received, whereafter the difference between the signal last received and said stored signal is formed.By the present invention, after said difference has been formed a signal substantially free of interference is received.The invention further comprises a device for carrying out said method.
    • 一种在发送和接收电磁产生和接收的超声脉冲的方法,特别是对导电材料的非破坏性测试。 该方法包括以下步骤:在发射机中通过第一线圈和磁芯产生第一磁场,并且以位于第一磁场中的发射器线圈提供超声频率的传输脉冲,并且在接收器中产生第二磁场 借助于第二线圈和磁芯以及位于第二磁场中的接收器线圈接收来自所述发射脉冲的信号的磁场。 当以这种方式测试非磁性材料时,信噪比较低。 噪声部分源自影响发射机和接收机磁体的产生的超声波。 根据本发明,当所述第一线圈(1)和所述第二线圈(2)中的电流具有相同或不同的方向时,使第一传输脉冲被发送和接收,之后所述接收信号被存储在存储器 8),之后当第一发送脉冲被发送和接收时的状态下,在所述第一线圈(1)或所述第二线圈(2)中的电流具有相反方向时,发送和接收第二发送脉冲 之后,形成最后接收的信号与所存储的信号之间的差异。 通过本发明,在形成所述差异之后,接收到基本上没有干扰的信号。 本发明还包括用于执行所述方法的装置。