Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-06-06
1996-07-23
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
148304, 148403, 420119, 420121, 420435, G08B 1324
Patent
active
055393802
ABSTRACT:
A glassy metal alloy consists essentially of the formula Co.sub.a Fe.sub.b Ni.sub.c M.sub.d B.sub.e Si.sub.f C.sub.g, where M is selected from molybdenum and chromium and "a", "b", "c", "d", "e", "f" and "g" are in atom percent, "a" ranges from about 40 to about 43, "b" ranges from about 35 to about 42 and "c" ranges from 0 to about 5, "d" ranges from 0 to about 3, "e" ranges from about 10 to about 25, "f" ranges from 0 to about 15 and "g" ranges from 0 to about 2. The alloy can be cast by rapid solidification into ribbon, annealed to enhance magnetic properties thereof, and formed into a marker that is especially suited for use in magneto-mechanically actuated article surveillance systems. Advantageously, the marker is characterized by relatively linear magnetization response in the frequency regime wherein harmonic marker systems operate magnetically. Voltage amplitudes detected for the marker are high, and interference between surveillance systems based on mechanical resonance and harmonic re-radiance is virtually eliminated.
REFERENCES:
patent: 5469140 (1995-11-01), Liu et al.
Hasegawa Ryusuke
Martis Ronald
Allied-Signal Inc.
Buff Ernest D.
Swann Glen
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