| 齐飞,陈晶晶,王润田.反相叠加减小超声检测盲区的方法[J].声学技术,2011,(4):325~329 |
| 反相叠加减小超声检测盲区的方法 |
| The opposite phase superposition method of decreasing blind zone in ultrasonic detection |
| 投稿时间：2011-01-02 修订日期：2011-04-20 |
| DOI： |
| 中文关键词: 超声检测 盲区 拖尾 |
| 英文关键词: ultrasonic detection blind zone trail |
| 基金项目: |
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| 中文摘要: |
| 对于收发合置应用的换能器,在发射脉冲信号的激励下,会产生一定的拖尾,在大尺度声学测量应用中这种拖尾可以被忽略,但是在短距离声学测量应用中,回波信号会淹没在激励信号的拖尾之中,导致测量盲区的加大。为了提高超声波的短距离测量能力,从换能器等效电路入手,通过分析换能器的频率特性,设计了换能器的等效高斯带通滤波器模型,提出了一种只需要简单的设计驱动信号的波形就能明显抑制拖尾的幅度,从而减小盲区的方法,并将该方法同常见的并联负载电阻抑制拖尾的方法进行了比较,本文提出的方法可以在不降低发射响应和接收灵敏度的情况下明显改善盲区。 |
| 英文摘要: |
| For the transceiver's transducer,a trail could be generated after launching a signal.The trail can be ignored for long distance acoustic detection.However,for short distance acoustic detection,the echo can be submerged in the trail of the launched signal,so the problem of blind zone needs to be seriously considered.In order to enhance the ability of ultrasonic detection in short distance,a model of Gaussian band-pass filter is designed after analyzing the equivalent circuit and frequency response features of ultrasonic transducer.And a method,which only needs simply designing the launch signal,is put forward to suppress the trail and decrease the blind zone.Comparing this method with the commonly used method of paralleling a resistance with transducer shows that the method in this paper can decrease the blind zone without lessening the launching response and receiving sensibility. |
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