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    • 5. 发明授权
    • Method for improving waveform digitization and circuit for implementing
said method
    • 改进波形数字化方法和实现所述方法的电路
    • US5568144A
    • 1996-10-22
    • US348011
    • 1994-12-01
    • Richard Y. ChiaoRalph A. HewesRobert S. Gilmore
    • Richard Y. ChiaoRalph A. HewesRobert S. Gilmore
    • H03M1/18
    • H03M1/186
    • A method and circuit for improved digitization of waveforms having a large dynamic range, including selecting a signal threshold value which partitions the dynamic range of the waveform into a small signal region and a large signal region; sampling the waveform to obtain a sampled signal therefrom at a given sampling frequency; for each sampled signal, comparing the sampled signal with the signal threshold value to determine whether the sampled signal is within the small signal region or the large signal region; and directly digitizing the sampled signal if the sampled signal is within the small signal region or differentially digitizing the sampled signal if the sampled signal is within the large signal region, wherein differentially digitizing the sampled signal includes digitizing a value representing the difference between the sampled signal at a present sampling instant and a previous sampling instant. One bit of each word of the digitized signal is reallocated to indicate whether it represents a directly or differentially digitized signal to enable the waveform to be digitally reconstructed in a data processing device.
    • 一种用于改进具有大动态范围的波形数字化的方法和电路,包括选择将波形的动态范围分成小信号区域和大信号区域的信号阈值; 以给定的采样频率对波形进行采样以获得采样信号; 对于每个采样信号,将采样信号与信号阈值进行比较,以确定采样信号是在小信号区域还是在大信号区域内; 如果采样信号在小信号区域内,则采样信号直接数字化,或者如果采样信号在大信号区域内差分数字化采样信号,则采样信号的差分数字化包括数字化表示采样信号之间的差值 在当前采样时刻和之前的采样时刻。 数字化信号的每个字的一位被重新分配以指示其是否表示直接或差分数字化的信号,以使波形能够在数据处理装置中进行数字重建。
    • 6. 发明授权
    • Eddy current surface inspection probe for aircraft fastener inspection,
and inspection method
    • 用于飞机紧固件检查的涡流表面检测探头和检查方法
    • US5510709A
    • 1996-04-23
    • US423489
    • 1995-04-19
    • Donna C. HurleyRobert S. GilmoreJohn D. Young
    • Donna C. HurleyRobert S. GilmoreJohn D. Young
    • G01N27/90G01N27/82
    • G01N27/9013
    • An eddy current surface inspection array probe and method for detecting cracks and flaws in aircraft skin metal immediately surrounding rivets, without requiring rivet removal or manual scanning. The array probe includes a circular array of small sense coils positioned beneath a much larger drive coil encased in ferrite. The sense coils are differentially connected in pairs such that the signals from two sense coils located on opposite sides of the rivet (180.degree. apart) subtract to produce a resultant output signal. During operation, the probe is positioned concentrically over the rivet and data acquired from all sense coil pairs. If no cracks or other defects are present, all sense coil pairs produce a null (zero) signal. If a crack exists, some sense coil pairs (the exact number depending on the crack length, number of sense coils, and sense coil spacing) produce a non-zero signal. The probe and method can be employed to inspect a variety of other structural features which are nominally circularly symmetrical.
    • 一种涡流表面检测阵列探头和方法,用于检测立即围绕铆钉的飞机皮肤金属中的裂纹和缺陷,无需拆除或手动扫描。 阵列探头包括位于铁氧体内包围的较大驱动线圈下面的小感测线圈的圆形阵列。 感测线圈成对地差分连接,使得来自位于铆钉(180°)相对侧上的两个感测线圈的信号减去以产生合成的输出信号。 在操作期间,探头同心地位于铆钉上,并从所有感测线圈对获得的数据。 如果没有出现裂纹或其他缺陷,则所有感测线圈对产生零(零)信号。 如果存在裂纹,则某些感测线圈对(根据裂纹长度,感测线圈数量和感测线圈间隔的精确数量)产生非零信号。 探头和方法可用于检查名义上圆形对称的各种其他结构特征。