专利名称：METHOD AND APPARATUS FOR NON-DESTRUCTIVE TESTING
发明人：HOOP J,US申请号：US3782177D申请日：19720420公开号：US3782177A公开日：19740101
摘要：A high voltage is applied to an arc gap adjacent to a test specimen to develop asuccession of high-frequency arc discharges. Those high frequency arc dischargesgenerate pulses of ultrasonic energy within the test specimen without requiring the arcdischarges to contact that test specimen and without requiring a coupling mediumbetween those arc discharges and that test specimen. Those pulses can be used fordetection of flaws, for measurement of certain properties of the test specimen, and formeasurement of stresses within that test specimen.
申请人：AERONAUTICS AND SPACE,US
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