Study on the Inspection for Shallow Area under Concrete Surface using Air-coupled Sound Wave
Study on the Inspection for Shallow Area under Concrete Surface using Air-coupled Sound Wave
复制标题
空气耦合声波混凝土表面浅层检测研究
DOI：
10.1190/segj102011-001.21
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
S. Tsujino
中科院分区：
文献类型：
--
作者：
R. Akamatsu;T. Sugimoto;H. Kawasaki;N. Utagawa;S. Tsujino
锤击法广泛应用于隧道或桥梁混凝土表面的检测。然而，用这种方法很难检查人们无法到达的地方。因此，我们提出了一种新的非接触式声成像无损检测方法，使用扫描激光多普勒测振仪（SLDV）和远程声学设备（LRAD）。在该方法中，混凝土表面的振动速度，这是由空气耦合声激励，使用SLDV测量。具有高声压和尖锐指向性的LRAD被用作振动源。我们进行了实验，以确认我们所提出的方法使用一个具体的测试件的有效性。在混凝土试件中埋入一块泡沫聚苯乙烯板（30×30×10 cm），作为空腔的替代物，深度为5 cm。扫描面积约为50 × 50 cm，扫描点数为195（15×13）。测量所有点的速度需要几分钟。混凝土试件表面附近的声压约为110 dB。作为实验结果，聚苯乙烯泡沫板被清楚地成像为混凝土表面的高速异常。此外，我们能够得到一个清晰的图像的泡沫塑料板的成像方法使用的频率的响应范围为一个被埋的对象。因此，我们可以得出结论，我们所提出的方法是有效的检测空洞位于浅混凝土表面。
The hammer method is widely used for the inspection of concrete surface of tunnels or bridge girders. With this method, however, it is difficult to inspect the places where people cannot reach. Therefore, we propose a new non-contact acoustic imaging method for nondestructive inspection using as a Scanning Laser Doppler Vibrometer (SLDV) and a Long Range Acoustic Device (LRAD). In this method, the vibration speed of concrete surface, which is excited by aircoupled sound, is measured using the SLDV. The LRAD, which have high sound pressure and a sharp directivity, is used as a vibration source. We carried out experiments to confirm the effectiveness of our proposed method using a concrete test-piece. A styrofoam board (30×30×10 cm) as a substitute for a cavity was buried in the concrete test-piece at the depth of 5 cm. The area for scanning is about 50x50 cm and the number of the scanned points is 195 (15×13). It takes a few minutes to measure the velocity at all points. The sound pressure near the surface of the concrete test piece is about 110 dB. As an experimental result, the styrofoam board was clearly imaged as a high velocity anomaly of the concrete surface. In addition, we were able to get a clear image of the styrofoam board by an imaging method using the response range of the frequency for an buried object. Therefore, we can conclude that our proposed method is effective for detecting a cavity which locates below the shallow concrete surface.
使用声波进行极浅层地下成像
DOI：
--
发表时间：
2006
期刊：
影响因子：
--
作者：
加藤茂弘;岡田篤正;寒川旭;Tsuneyoshi Sugimoto
通讯作者：
Tsuneyoshi Sugimoto