Abstract
The surveillance of the bottom sediment condition, especially detecting buried objects in sediment is important to assure safety in harbor construction work. Conventionally, however, a slant cylindrical object is usually detected as if there were two objects because the image is separated into two—each corresponds to its end—when using a usual plane type transducer. A test has been conducted in which, using a focused array transducer having elements arranged on a concaved surface, the detection characteristic of slant object has been found to be improved to a great extent as long as the object gradient is within a half of the transducer aperture angle. The frequencies used are 150 kHz when the object is scaled down to 1/10 and 15 kHz in the actual scale test. Two displays are used, one for the vertical plane, the other for horizontal plane. In the actual test, the cylindrical iron tube and others are buried in a sand‐box of 2 m deep having 4 × 3‐m2 area and apparent improvement has been observed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
