Magnetic Amplifier Housing and Detector for an Improved Tamper Alarm System.
Patent Application, Filed 17 Jun 88,
DEPARTMENT OF THE NAVY WASHINGTON DC
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The magnetic amplifier housing of the current invention uses steel dowels and shunts to concentrate the magnetic field of a ring magnet or cluster of magnets through a Hall Effect transistor. A magnetic amplifier housing causes an increase in gain of the transistor and causes polarity reversal when tampered with. In addition, the housing ensures positive mechanical alignment of the transistor and magnet components while protecting the transistor from mechanical damage. A ring magnet or cluster of magnets mounted in a suitable configuration is mounted on one portion of a latch system. A Hall Effect transistor is mounted within a steel housing having a steel dowel which is operable to mesh with the center of the ring magnet. A steel shunt on the ring magnet can be used to concentrate the magnetic field through the center of the magnet. By shunting the magnetic field through the center of the magnet, a higher initial signal is provided when the components are meshed together. RH
- Electrical and Electronic Equipment