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压电换能器是超声无损检验的主要元件。为了使测量结果可靠必须知道压电换能器频率振幅的特性,其误差不大于10～20%,通常用频谱法获得这种特性。测量压电换能器频率振幅特性的示意图如图1a 所示。图中:1—短视频脉冲发生器;2—压电换能器;3—水槽;4—反射体;5—选频线路;6—频谱分析器。发生器是用短视频脉冲来激励压
Piezoelectric transducers are the main components of ultrasonic non-destructive testing. In order to make reliable measurements must know the piezoelectric transducer frequency amplitude characteristics, the error is not greater than 10 ~ 20%, usually obtained by spectral spectrum of this feature. A schematic diagram of measuring the frequency amplitude characteristics of a piezoelectric transducer is shown in Figure 1a. In the figures: 1-short video pulse generator; 2-piezoelectric transducer; 3-tank; 4-reflector; 5-frequency selection line; 6-spectrum analyzer. The generator uses short video pulses to energize the pressure