Magnetic Domain Strain Sensor Program
Abstract
The Magnetic Domain Strain Sensor Program began in September 1986 to demonstrate the feasibility of using the magnetostrictive properties of magnetic alloys in the design of a new type of strain gage. The Magnetic Domain Strain Sensor offered advantages over the resistive strain gage in the areas of: digital data acquisition; increased temperature capability; and potentially determining residual strain and fatigue. Theory development bore out a modified Sixtus-Tonks model, measuring domain inversion time instead of magnetic pulse propagation. The modified theory that developed led to improved gage measurement accuracy. Phase I testing of wire and ribbon magnetic alloy sensors supported the theory development. Phase II developed the thin film technology for both the amorphous metallic glass sensor and the coils for eventual full gage fabrication in the program's Phase III portion. Many obstacles had to be overcome in this program, especially in developing the thin film sputtering technology. The feasibility of the magnetic domain strain gage was demonstrated, but significant development still remains to be performed before the sensor can be considered a production test device.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1990
- Accession Number
- ADA227225
Entities
People
- Bernard O'halloran
- Gordon Fish
- Harvey Niska
- Steve Mina