Directional resonance magnetometer

Details Directional resonance magnetometer Directional resonance magnetometer

1991-06-13

1993-06-22

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Using a magnetometer

324301, G01V 300

Patent

active

052218970

ABSTRACT:
It is used for measuring a magnetic-field Hlex, which is the projection, in a given direction, of a field Hex and which incorporates a sample (2) containing resonant spins, first means (4) for exciting the resonance and detecting the latter, second means (32) for producing a polarization field Hb in accordance with the direction and compensating Hlex, processing and closed loop control means (6, 8, 16 to 20, 34 to 38, 48 to 52, 40, 44), which are connected to the first and second means and which make it possible to obtain voltages proportional to Hb-Ho+hlex and to Ho-Hb+Hlex in the vicinity of the resonance, Ho being the value of the field at resonance, with Ho being well above Hex, and a pulsed square-wave current for inducing Hb and for supplying a voltage proportional to Hlex in particular to the second magnetic means.

REFERENCES:
patent: 3191118 (1965-06-01), Jung et al.
patent: 3495163 (1970-02-01), Salvi
patent: 4623844 (1986-11-01), Macovski
patent: 4814707 (1989-03-01), Marton
patent: 4916393 (1990-04-01), Crescini et al.
patent: 4996311 (1991-02-01), Moussavi et al.
Article by K. Weyand, published in IEEE Transactions on Instrumentation and Measurement, vol. 38, No. 2, Apr. 1989, pp. 410 to 414.

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