The Magnetic Recording Borescope - Instrumentation for the Inspection of Cannon Tubes
Product technical rept.
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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A two-phase project was implemented with the objective of extending the Magnetic Recording Borescope MRB capability to various caliber cannon tubes. Phase I involved the design and fabrication of an integral, self- propelled scanning mechanism adaptable to calibers 152mm through 175mm and Phase II provided a second model for similar adaptation to 90-mm and 105-mm tubes. The principle of operation is based on the electronic sensing of magnetic leakage fields associated with cracks in a previously magnetized gun tube. A Hall-effect device was incorporated as the magnetic field detector. The resulting MRB readout includes a continuous three-dimensional recording of the interrogated bore surface as well as a two-dimensional recording where quantitative defect signal amplitude data may be obtained for correlation with crack depth.
- Test Facilities, Equipment and Methods