G - Physics – 01 – N
Patent
G - Physics
01
N
31/133, 148/25,
G01N 27/72 (2006.01) C23C 8/10 (2006.01) G08B 13/24 (2006.01) H01F 1/153 (2006.01) H01F 1/18 (2006.01)
Patent
CA 2039989
A novel sensor element having low magnetic coercivity and an asymmetric hysteresis characteristic is formed by heating a strip of cobalt alloy in an oxidizing 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.
Cooper Michael Nelson
Shin Kyung-Ho
Solaski Thomas Patrick
Teague Jeffrey
Zhou Peter Yongxin
Goudreau Gage Dubuc
Knogo North America Inc.
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