Accession Number : ADD013028

Title :   Nuclear Magnetic Resonance Gyroscope.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Karwacki,Francis A ; Griffin,Joseph

Report Date : 02 Apr 1985

Pagination or Media Count : 11

Abstract : This patent discloses a nuclear magnetic resonance gyroscope which derives angular rotation thereof from the phases of processing 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 199 and Hg201. Unpolarized intensity modulated 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 transversor 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.

Descriptors :   *PATENTS, *GYROSCOPES, *NUCLEAR MAGNETIC RESONANCE, ARRAYS, CIRCULAR, COILS, CONTROL, FEEDBACK, INTENSITY, LIGHT, MODULATION, CELLS, MIRRORS, ELECTRONICS, FLOW, ISOTOPES, LINEAR SYSTEMS, POLARIZERS, NUCLEAR MOMENTS, MERCURY, ISOTOPE EFFECT, OPTICAL PUMPING, PHOTODIODES, READ OUT TECHNIQUES, DIRECT CURRENT, MAGNETIC FIELDS, PARALLEL ORIENTATION, PLATES, POLARIZATION, SIGNAL PROCESSING

Subject Categories : Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE