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超声波首波波幅差异与声时测量值的关系

童寿兴, 伍根伙

童寿兴, 伍根伙. 超声波首波波幅差异与声时测量值的关系[J]. 无损检测, 2010, 32(5): 367-369.
引用本文: 童寿兴, 伍根伙. 超声波首波波幅差异与声时测量值的关系[J]. 无损检测, 2010, 32(5): 367-369.
TONG Shou-Xing, WU Gen-Huo. The Relationship Between the Ultrasonic Head Wave Amplitude Difference and the Measured Sonic Time Value[J]. Nondestructive Testing, 2010, 32(5): 367-369.
Citation: TONG Shou-Xing, WU Gen-Huo. The Relationship Between the Ultrasonic Head Wave Amplitude Difference and the Measured Sonic Time Value[J]. Nondestructive Testing, 2010, 32(5): 367-369.

超声波首波波幅差异与声时测量值的关系

详细信息
    作者简介:

    童寿兴(1952-), 男, 副教授, 副所长, 中国土木工程学会建设工程无损检测技术委员会副主任, 专职从事混凝土非破损检测技术的教学和研究工作。

  • 中图分类号: TG115.28

The Relationship Between the Ultrasonic Head Wave Amplitude Difference and the Measured Sonic Time Value

  • 摘要: 研究了超声波首波波幅对声时测量值的影响程度。结果表明, 采用模拟型超声检测仪, 随着首波波幅的减小, 声时值读数偏大, 而且声时值偏长的程度随着首波波幅的缩小而增大。在平测法声时测量中, 虽然随首波波幅的减小声时值读数同样偏大, 但如在测距步进增大中仍采取等幅读数, 时距回归得到的平测声速与首波设定的等幅波幅的取值无关; 采用智能型超声检测仪, 首波波幅在一定的范围内变动, 声时读数重复性好, 但首波波幅过大或过小时都会造成读数偏差。
    Abstract: This paper focuses on the purpose to find out the influence of ultrasonic head wave amplitude on measured sonic time value. With analog type ultrasonic detector, the sonic time value monitored leans towards higher when the ultrasonic head wave amplitude decreases. Furthermore, its degree of increase is higher while the head wave amplitude becomes narrower. In plane test method, the value likewise leans towards higher when the head ultrasonic wave decreases. However, the average measured speed of sonic wave obtained from the time-distance curve is not relevant to the constant set value of the head wave amplitude, adopting constant amplitude value in the increase of test distance step. With the intelligent ultrasonic detector, when the head wave amplitude changes in certain range, the duplication of sonic time reading is satisfactory, but either oversized amplitude or too undersized amplitude of head wave leads to reading deviation.
  • [1] 林维正.土木工程质量无损检测技术[M].北京: 中国电力出版社, 2008: 36-38.
    [2] 吴慧敏.结构混凝土现场检测技术[M].长沙: 湖南大学出版社, 1988: 65-66.
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出版历程
  • 收稿日期:  2009-07-11
  • 刊出日期:  2010-05-09

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