Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-02-23
1997-02-11
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
148103, 148105, 340572, G08B 1324
Patent
active
056025270
ABSTRACT:
An assembly of a dry coating (A) that has a magnetic powder with a saturation flux density of at least 100 emu/g is dispersed in a binder. A magnetostrictive metal (B), when the coating (A) is magnetized, resonates mechanically at a predetermined frequency in the range of varying frequencies. The varying frequencies are generated from an applied alternating magnetic field. Changes in flux density and permeability are experienced. When the coating (A) is not magnetized, metal (B) does not resonate at the predetermined frequency, thus experiencing no changes in flux density or permeability. The dry coating (A) and the metal (B) have a superposed relationship in such a way that the latter is capable of mechanical resonance, the marker being so adapted that when said coating (A) is magnetized, the predetermined frequency at which the flux density or permeability will change is generated as a signal in response to the applied alternating magnetic field.
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Dainippon Ink & Chemicals Incorporated
Swann Glen
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