Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-04-10
1991-07-02
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340572, G08B 1324
Patent
active
050292919
ABSTRACT:
A novel sensor element having low magnetic coercivity and an asymmetric hysteresis characteristic is formed by heating a strip of cobalt alloy in an exidizing atmosphere to form an oxide coating thereon and then the strip is cooled in the presence of a magnetic field of about 0.3 oersteds along its length. The strip is detected by subjecting it to an alternating magnetic interrogation field and passing the resulting magnetic disturbances through signal processing circuits which select pulses produced only once in each interrogation field cycle. The element is deactivated by subjecting it to a magnetic field which eliminates its asymmetry.
REFERENCES:
patent: 2988466 (1961-06-01), Meiklejohn
patent: 4326198 (1982-04-01), Novikoff
patent: 4623877 (1986-11-01), Buckens
patent: 4660025 (1987-04-01), Humphrey
patent: 4800457 (1989-01-01), Kryder et al.
patent: 4945339 (1990-07-01), Yamauchi et al.
Wing Kei Ho, et al., Anisotropy Pinning of Domain Walls in Soft Magnetic Material, 8/1989 IEEE.
Exchange Anisotropy, 1977, pp. 43-45 Permanent Magnets.
Meiklejohn, et al., "New Magnetic Anisotropy" Jun. 1, 1956, pp. 1413-1414 Physical review, vol. 102, No. 5.
Cooper Michael N.
Shin Kyung-Ho
Solaski Thomas P.
Taegue Jeffrey
Zhou Y. Peter
Knogo Corporation
Mullen Jr. Thomas J.
Swann III Glen R.
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