Metal working – Method of mechanical manufacture – Electrical device making
Patent
1994-01-03
1995-07-04
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
148108, 148121, H01F 4106
Patent
active
054288886
ABSTRACT:
A manufacturing process for use in manufacturing magnetic field sensor head cores, comprises: providing a core formed of an amorphous ferromagnetic material on which is placed an insulating layer; mounting, a first winding that functions as a drive coil for the core over said insulating layer; providing second (37) and third (38) coils on said core (31) that respectively function as a sensor and a compensating coil for the sensor head; both the second and third coils being wound in form of a hollow cylinder 36 inside of which is positioned an assembly formed by the core 31 and the drive coil 32; supplying a first electric current to the core 31 of the sensor head, said core heating up as said first current flows through said drive winding, supplying a second and alternating electric current to that the one 38 of compensating and sensor coils 37 and 38 that surrounds the core 31 and functions as the compensating winding 38; monitoring a signal induced in the other coil 37 that functions as the sensor winding as said second alternating current flows through said compensating coil 38; and, then, terminating the flow of the first electric current to the drive coil when a level of the signal induced in the sensor coil 37 abruptly drops in a level thereof, indicating that a Curie temperature of the core has been reached and internal stresses in the core have been relaxed.
REFERENCES:
patent: 5032947 (1991-07-01), Li et al.
The "Flux-gate magnetometer" by F. Primdahl, published in the J. Phys. E: Sci. Instrum., vol. 12, 1979, p. 241 et. seq.
"Switch capacitor circuits" by Philip E. Allen & Edgar Sanchez-Sinenchio, Van Nostrand Reinhold Company Inc., 135 West 50th Street, N.Y. 10020 USA.
Databook vol. 1, 1989, National Semiconductor, "Data Acquisition Linear Devices", pp. 1-152 to 1-173, dev.: MF8, 4th-Order Switched Capacitor Bandpass Filter.
Databook vol. 2, Texas Instruments, "Linear Circuits", Data Acquisition and Conversion, pp. 2-139 to 2-153, dev.: TLC10/MF10A, TLC20/MF10C, Universal Dual Switched-Capacitor Filter.
B. B. Narod and J. R. Bennest, "An Evaluation of the Noise Performance of Fe, Co, Si, and B Amorphous Alloys in Ring-Core Fluxgate Magnetometers", pp. 1468-1472, Can, J. Phys. vol. 63, 1985.
Donald C. Scouten, "Sensor Noise in Low-Level Flux-Gate Magnetometers", IEEE Transactions on Magnetics, vol. MAG-8, No. 2, Jun. 1972, pp. 223-231.
Hernandez-Ros Claudio A.
Perez Eloisa L.
Sanchez Pedro S.
Trujilio Ma Carmen S.
Alcatel Standard Electrica S.A.
Hall Carl E.
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