Electricity: measuring and testing – Particle precession resonance – Using optical pumping or sensing device
Patent
1982-11-23
1985-04-02
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using optical pumping or sensing device
335296, 324304, G01R 3308
Patent
active
045090149
ABSTRACT:
A nuclear magnetic resonance gyroscope which derives angular rotation thef from the phases of precessing nuclear moments utilizes a single-resonance cell situated in the center of a uniform DC magnetic field. The field is generated by current flow through a circular array of coils between parallel plates. It also utilizes a pump and read-out beam and associated electronics for signal processing and control. Encapsulated in the cell for sensing rotation are odd isotopes of Mercury Hg.sup.199 and Hg.sup.201. Unpolarized intensity modulated light from a pump lamp is directed by lenses to a linear polarizer, quarter wave plate combination producing circularly polarized light. The circularly polarized light is reflected by a mirror to the cell transverse to the field for optical pumping of the isotopes. Unpolarized light from a readout lamp is directed by lenses to another linear polarizer. The linearly polarized light is reflected by another mirror to the cell transverse to the field and orthogonal to the pump lamp light. The linear light after transversing the cell strikes an analyzer where it is converted to an intensity-modulated light. The modulated light is detected by a photodiode processed and utilized as feedback to control the field and pump lamp excitation and readout of angular displacement.
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Griffin Joseph
Karwacki Francis A.
Beers Robert F.
Hansen Henry
The United States of America as represented by the Secretary of
Tokar Michael J.
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