Study on Non-Contact Acoustic Imaging Method for Concrete Structures--The 2nd Construction Method us

来源 :2015两岸超声技术与医学研讨会 | 被引量 : 0次 | 上传用户:shijunjie88
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Background, Motivation and Objective The long distance non-contact acoustic inspection method with defective detection accuracy comparable as the hammer method has been examined. This is the technique of having combined a scanning laser Doppler vibrometer (SLDV) and a long-distance acoustic device (LRAD). Although the directional characteristics of the LRAD itself are excellent in 1 kHz with ±15 degree. There are problems such as angular dependence nature to a subject and noise to the circumference at the time of considering practical use. Then, the case where a strong ultrasonic sound source and LDV for a single point were combined as the 2nd construction of the non-contact acoustic inspection method was examined.
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