A Dynamic Magnetic Technique for Sensing Block Motion.
Final rept. 22 Aug 77-30 Apr 78,
SYSTEMS SCIENCE AND SOFTWARE LA JOLLA CALIF
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We report the development of a technique for dynamically sensing relative displacements the intended application is for the measurement of block motion due to an underground explosion. The technique utilizes a permanent bar magnet and a magnetometer system located about a meter from the magnet. Relative motoin between the magnet and magnetometer system leads to a time-varying magnetometer signal. The well-known properties of a magnetic dipole allows the magnets relative position to be derived from the observed signals. We discuss hardening of the magnetometer to withstand ground shock. We also show that the magnetometer system must measure both the magnetic field vector and approximately one component of the fields gradient in order to reliably infer the magnets position from the observed signals. Author
- Magnetic and Electric Field Detection and Detectors