The Magnetic Recording Borescope - Instrumentation for the Inspection of Cannon Tubes
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1971
- Accession Number
- AD0737586
Entities
People
- Harold P. Hatch
- Nicola Rosato
Organizations
- United States Army Research Laboratory