公开(公告)号：US06601451B1

公开(公告)日：2003-08-05

申请号：US09885506

申请日：2001-06-20

申请人： Ronald Allen Roberts

发明人： Ronald Allen Roberts

IPC分类号： G01N2916

CPC分类号： G01N29/38 ,  G01N29/041 ,  G01N29/075 ,  G01N29/12 ,  G01N29/348 ,  G01N2291/014 ,  G01N2291/015 ,  G01N2291/0423 ,  G01N2291/048 ,  G01N2291/102

摘要： Presented is a system and method for performing highly sensitive measurement of ultrasonic attenuation in small material volumes. The invention allows the mapping of the variations on the surface of a specimen with a high spatial resolution. An ultrasonic transmitter and receiver transmit an ultrasonic signal through a material volume, receive the transmitted pulse, and then re-transmit the received pulse again through the same material volume. The system establishes an oscillating circuit by establishing a positive feedback loop by connecting the transmitter to the receiver with appropriate gain. This oscillating circuit contains the propagation through the material as a component in the signal path. Such a system and method may be employed to aid in the recovery of stamped or engraved serial numbers that have been removed through machining. Such recovery is useful for law enforcement, particularly in tracing weapons and auto parts that have been involved in a crime.

摘要翻译： 提出了一种用于在小材料体积中执行超声波衰减的高灵敏度测量的系统和方法。 本发明允许以高空间分辨率对样本表面上的变化进行映射。 超声波发射器和接收器通过材料体积传输超声波信号，接收发送的脉冲，然后通过相同的材料体积重新发送接收到的脉冲。 该系统通过以适当的增益将发射机连接到接收机来建立正反馈回路来建立振荡电路。 该振荡电路包含作为信号路径中的分量的材料的传播。 可以采用这种系统和方法来帮助恢复通过机械加工去除的冲压或雕刻的序列号。 这种复原对于执法尤其在追查涉嫌犯罪的武器和汽车零部件方面是有用的。