Laser-pumped helium magnetometer

Details Laser-pumped helium magnetometer Laser-pumped helium magnetometer

1987-04-23

1989-02-21

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a magnetometer

324304, G01R 3324

Patent

active

048068640

ABSTRACT:
A magnetometer comprises a transparent spherical photocell (1) filled with natural helium 4He. A laser (2) of the LNA (lanthanum-neodymium aluminate) type excites the photocell. An oscillator (3) generates a soft discharge inside the photocell (1). The electronic magnetic resonance frequency of helium atoms in the excited metastable state is determined on the basis of the light (FT) transmitted by the photocell, under excitation by a radio electric field, and the magnetic induction is thereby found.

REFERENCES:
patent: 3629697 (1971-12-01), Dupont-Roc et al.
patent: 4193029 (1980-03-01), Cioccio et al.
patent: 4249141 (1981-02-01), Brown et al.
patent: 4327327 (1982-04-01), Greenwood
IEEE Transactions on Magnetics, Francis Hartmann, "Resonance Magnetometers", vol. Mag-8, No. 1, Mar. 1972.
IEEE Journal of Quantum Electronics, Laird D. Schearer et al., "LNA: A new CW Nd Laser Turnable Around 1.05 and 1.08 .mu.m", vol. OE-22, No. 5, May 1986.
8127 Review of Scientific Instruments, vol. 53 (1982) Sep., Measurement of the Spin Polarization of an Optically Pumped Ensemble of He (2.sup.3 S) Atoms, Cheng et al.

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