Accession Number:

AD0737586

Title:

The Magnetic Recording Borescope - Instrumentation for the Inspection of Cannon Tubes

Descriptive Note:

Product technical rept.

Corporate Author:

ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA

Personal Author(s):

Report Date:

1971-11-01

Pagination or Media Count:

37.0

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.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Guns

Distribution Statement:

APPROVED FOR PUBLIC RELEASE