Challenge of non-contact and non-destructive imaging of micro crack in shallow layer of concrete by very high intensity aerial ultrasonic wave

2016 Fiscal Year Final Research Report

• Project/Area Number: 15H05530
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Nihon University
• Principal Investigator: OSUMI Ayumu 日本大学, 理工学部, 助教 (40579413)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 非破壊検査 / 空中超音波 / 非線形音響 / 高調波 / 非接触 / き裂

Outline of Final Research Achievements

In recent years, deterioration of concrete structures decades since construction was concerned, and development of effective noncontact nondestructive diagnostic technology is required. Genally, infrared method and electromagnetic wave method are developed and used. On the other hand, non-contact acoustic methods using acoustic waves have been researched and developed recently. The objective of this study is to develop a non-contact and non-destructive measurement system for imaging a micro crack in shallow layer in concrete by very high-intensity aerial ultrasonic waves and Laser Doppler galvanometer. In this study, we performed (1) development of experimental device (2) formation of experimental specimen (3) experiment of detecting defect by development system.
As a result, it is demonstrated that 1 mm wide cracks in shallow layer of mortar assuming concrete can be imaged with high accuracy using the developed experimental apparatus and measurement system.

Free Research Field

超音波工学