The questions that are being asked in this investigation are: (1) once an ELF signal is generated, how far does it propagate and still be detectable and (2) how can such signals be modeled, excited and measured? To this end, the scenario considered is one in which an ELF source of the electric or magnetic kind is located in or above water, such as a lake or ocean. This source ...
Conventional ultrasonic inspection techniques may not possess the required attributes to detect early stages of creep cracking, accurately size indications or differentiate between benign and detrimental defects. Typical types of damage are presented and the need for personnel and procedure qualification programs discussed. Training using service damaged reference materials has been found to be necessary. (Author).
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