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Magnetic Field Distribution and Design of Helmholtz Coils.

ADA242978

Publication Date	1991
Personal Author	Vrbancich, J.
Page Count	62
Abstract	A uniform magnetic field is required to calibrate magnetic induction sensor coils. Two types of coil designs are considered; a single finite length solenoid and a coaxially split coil pair (Helmholtz coil). The design must be able to reliably predict the magnitude of the calibration field and its homogeneity, both radially and axially, to within certain tolerances. The experimental results of a design based on the split coil pair are given. Furthermore, it is suggested that the quasi-uniform field in the mid-plane of a split coil pair can be usefully extended by narrowing the gap of the conventional Helmholtz coil pair spacing. In such cases, the flux in a circular region in the mid-plane can approach the value that would exist for a perfectly uniform field because of the partial cancellation between fields greater than and less than the central field. The deviation of the central field from that of an infinitely long solenoid is also discussed. (Author)
Keywords	Calibration Circular Magnet coils Magnetic detectors Magnetic fields Magnetic induction Solenoids Foreign technology Helmholtz coils Electric coils
Source Agency	Non Paid ADAS
NTIS Subject Category	49G - Resistive, Capacitive, & Inductive Components 46 - Physics
Corporate Authors	Materials Research Labs., Ascot Vale (Australia).; Department of Defence, Canberra (Australia).
Supplemental Notes	Errata sheet inserted.
Document Type	Technical Report
Title Note	Technical rept.
NTIS Issue Number	199206

Magnetic Field Distribution and Design of Helmholtz Coils.

Magnetic Field Distribution and Design of Helmholtz Coils.
ADA242978

Publication Date	1991
Personal Author	Vrbancich, J.
Page Count	62
Abstract	A uniform magnetic field is required to calibrate magnetic induction sensor coils. Two types of coil designs are considered; a single finite length solenoid and a coaxially split coil pair (Helmholtz coil). The design must be able to reliably predict the magnitude of the calibration field and its homogeneity, both radially and axially, to within certain tolerances. The experimental results of a design based on the split coil pair are given. Furthermore, it is suggested that the quasi-uniform field in the mid-plane of a split coil pair can be usefully extended by narrowing the gap of the conventional Helmholtz coil pair spacing. In such cases, the flux in a circular region in the mid-plane can approach the value that would exist for a perfectly uniform field because of the partial cancellation between fields greater than and less than the central field. The deviation of the central field from that of an infinitely long solenoid is also discussed. (Author)
Keywords	Calibration Circular Magnet coils Magnetic detectors Magnetic fields Magnetic induction Solenoids Foreign technology Helmholtz coils Electric coils
Source Agency	Non Paid ADAS
NTIS Subject Category	49G - Resistive, Capacitive, & Inductive Components 46 - Physics
Corporate Authors	Materials Research Labs., Ascot Vale (Australia).; Department of Defence, Canberra (Australia).
Supplemental Notes	Errata sheet inserted.
Document Type	Technical Report
Title Note	Technical rept.
NTIS Issue Number	199206