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The Ultransonic Inspection of Cast Explosive Billets.

机译:铸造炸药坯的超声波检测。

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The development of an ultrasonic inspection capability to detect air voids in PBXN-106 cast explosive billets is described. Begining with feasibility tests, the evolution of a suitable technique through research and development has culminated in the design and fabrication of an assembly-line prototype system. Principal attention is given to the technical development portion of the program. The choice of optimum ultrasonic transducers for both transmission and reflection, and the associated electronics hardware is described. A critical analysis of focused transducers, transducer bandwidth, and couplant materials is presented, in addition to the ultrasonic frequency dependence of the energy attenuation in the explosive. Several methods of hard-copy production for permanent flaw recording are described. Atuomatic gain control of the output signal is discussed for applications to a completely automated recording system. Finally, on-line tests results are given to compare the flaw detection capability of the ultrasonic system to that of X-ray.

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