Accession Number : ADD012105

Title :   Nuclear Magnetic Resonance Gyroscope.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Karwacki, Francis A

Report Date : 01 Oct 1985

Pagination or Media Count : 11

Abstract : A nuclear magnetic resonance gyroscope which derives angular rotation thereof from the phases of precessing nuclear moments utilizes a single-resonance cel 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 readout beam and associated electronics for signal processing and control. Encapsulated in the cell for sensing rotation are odd isotopes of Mercury Hg199 and Hg201. Unpolarized intensity modulated light from a pump lamp is directed by lenses to a 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 and 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. (Author)

Descriptors :   *PATENTS, *NUCLEAR MOMENTS, *POLARIZERS, *GYROSCOPES, *MAGNETIC RESONANCE, *NUCLEAR MAGNETIC RESONANCE, ANGULAR MOTION, ARRAYS, CIRCULAR, COILS, CONTROL, DIRECT CURRENT, ELECTRONICS, FEEDBACK, INTENSITY, LIGHT, LINEAR SYSTEMS, MAGNETIC FIELDS, MODULATION, PARALLEL ORIENTATION, PHOTODIODES, PLATES, POLARIZATION

Subject Categories : Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE