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    • 2. 发明申请
    • CIRCUITRY FOR MEASURING AND COMPENSATING PHASE AND AMPLITUDE DIFFERENCES IN NDT/NDI OPERATION
    • 用于测量和补偿无损检测/ NDI操作中的相位和幅度差异的电路
    • US20130030726A1
    • 2013-01-31
    • US13194568
    • 2011-07-29
    • Andrew THOMASMarc DULAC
    • Andrew THOMASMarc DULAC
    • G06F19/00G01N29/48
    • 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。
    • 4. 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。