Unclassified 



20. Continued 



and field tests to evaluate the capability of an indirect ultrasonic system and impact 

 system to accurately measure the percent cross-sectional wood loss are presented in 

 detail. 



Library Card 



Naval Civil Engineering Laboratory 



EVALUATION OF NONDESTRUCTIVE UNDERWATER 

 TIMBER INSPECTION TECHNIQUES, by C. A. Keeney and 

 S. E. Pollio 



TN-1703 58ppillus August 1984 Unclassified 

 1. Underwater inspection 2. Nondestructive testing I. YF60.534.091.01.202B 



This report presents the assessment of potential techniques for underwater nondestructive 

 testing of timber piles. Three techniques are discussed: X-ray tomography, indirect ultrasonic 

 testing, and impact testing. A computerized axial tomography (CAT) system has never been 

 used underwater to date. However, studies concluded that the underwater application of 

 tomography is technically feasible. A brief introduction to the proposed prototype underwater 

 CAT system is presented. In addition, results of laboratory and field tests to evaluate the capa- 

 bility of an indirect ultrasonic system and impact system to accurately measure the percent 

 cross-sectional wood loss are presented in detail. 



Unclassified 



CLASSIFICATION OF THIS PAGErW/ion Da 



