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    • 83. 发明申请
    • PACKET BASED DDS MINIMIZING MATHEMATICAL AND DAC NOISE
    • 基于分组的DDS最小化数字和DAC噪声
    • US20150212184A1
    • 2015-07-30
    • US14163600
    • 2014-01-24
    • Andrew Thomas
    • Andrew Thomas
    • G01R35/00
    • G06F1/0321G01N27/9046G06F1/022G06F17/5045
    • Disclosed are a method of and an apparatus devising a packet based DDS circuitry for performing packet based a direct digital synthesizing (DDS) function within an electronic testing instrument. The circuitry comprising a DDS logic circuit configured to execute direct digital syntheses on a plurality of consecutive packets of sine-like waves, each packet having a length of a period precisely chosen such that the sine wave at the end of one packet matches up with the sine wave at the start of the immediate subsequent packet. Also disclosed is an eddy current testing circuitry using multiple outputs of the single packet based DDS, one of the output is used in a circuit producing reference signals approximating the response signals. With the usage of the packet based DDS, the reference signal can be highly effective in nulling the unchanging portion of the response signals.
    • 公开了一种设计基于分组的DDS电路的方法和装置,用于基于电子测试仪器内的直接数字合成(DDS)功能执行分组。 该电路包括DDS逻辑电路,该DDS逻辑电路经配置以在正弦波的多个连续分组上执行直接数字合成,每个分组具有精确选择的周期的长度,使得一个分组结束时的正弦波与 正弦波在即时后续数据包的开始。 还公开了使用基于单个分组的DDS的多个输出的涡流测试电路,其中一个输出用于产生近似响应信号的参考信号。 通过使用基于分组的DDS,参考信号可以在使响应信号的不变部分归零时非常有效。
    • 86. 发明授权
    • Circuitry for measuring and compensating phase and amplitude differences in NDT/NDI operation
    • 用于测量和补偿NDT / NDI操作中的相位和幅度差的电路
    • US08712716B2
    • 2014-04-29
    • US13194568
    • 2011-07-29
    • Andrew ThomasMarc Dulac
    • Andrew ThomasMarc Dulac
    • G06F19/00
    • G01N29/32G01N29/36G01N29/4436
    • Disclosed are a method and an NDT/NDI inspection device deploying digital circuitry to conduct detection and compensation of phase and amplitude shift in responding signals. A digital waveform generator, such as a direct digital synthesizer (DDS) is used to generate a digital sine-wave of a specific frequency and amplitude, mimicking the pulser frequency and amplitude. The sine-wave is converted to analog signal through a DAC and transmitted to the transducer. The received analog sine-wave from the transducer is converted back to a digital signal through an ADC. The transmitted and received digital signals are then compared for phase and amplitude differences. A null circuit involving another waveform generating component is employed to compensate the detected phase and amplitude differences. As a result the phase and amplitude differences are effectively eliminated before being further processed and analyzed for defects information.
    • 公开了一种方法和NDT / NDI检测装置,其部署数字电路以进行响应信号中的相位和幅度偏移的检测和补偿。 诸如直接数字合成器(DDS)的数字波形发生器用于产生特定频率和幅度的数字正弦波,模拟脉冲发生器的频率和振幅。 正弦波通过DAC转换为模拟信号并传输到传感器。 来自传感器的接收到的模拟正弦波通过ADC转换回数字信号。 然后将发送和接收的数字信号进行相位和幅度差分比较。 采用涉及另一个波形发生部件的零电路来补偿检测到的相位和幅度差异。 因此,在进一步处理和分析缺陷信息之前,相位和幅度差异被有效地消除。