Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1997-02-14
1999-09-07
Tong, Nina
Communications: electrical
Condition responsive indicating system
Specific condition
3405726, 148108, 148304, 148DIG3, 266110, 266249, G08B 1314
Patent
active
059493348
ABSTRACT:
A magnetostrictive element for use in a magnetomechanical marker has a resonant frequency characteristic that is at a minimum at a bias field level corresponding to the operating point of the magnetomechanical marker. The magnetostrictive element has a magnetomechanical coupling factor k in the range 0.28 to 0.4 at the operating point. The magnetostrictive element is formed by applying current-annealing to an iron-nickel-cobalt based amorphous metal ribbon, or by cross-field annealing an iron-nickel-cobalt alloy that includes a few percent chromium and/or niobium.
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Coffey Kevin
Copeland Richard
Ho Wing
Lian Ming-Ren
Liu Nen-Chin
Sensormatic Electronics Corporation
Tong Nina
LandOfFree
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