Geary K Schwemmer

US Patent:

6479808, Nov 12, 2002

Filed:

Jun 28, 2000

Appl. No.:

09/605649

Inventors:

Geary K. Schwemmer - Hampstead MD

Assignee:

The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

International Classification:

G02B 704

US Classification:

2502015, 2502014, 2502081

Abstract:

Systems and methods for processing light from multiple fields ( ) of view without excessive machinery for scanning optical elements. In an exemplary embodiment of the invention, multiple holographic optical elements ( ), integrated on a common film ( ), diffract and project light from respective fields of view.

US Patent:

51842416, Feb 2, 1993

Filed:

Jun 21, 1989

Appl. No.:

7/369171

Inventors:

Geary K. Schwemmer - Hampstead MD

Assignee:

The United States of America as represented by the Administrator of the
National Aeronautics & Space Admininstration - Washington DC

International Classification:

H04B 1000

US Classification:

359161

Abstract:

A laser transmitting and receiving system includes doppler compensation for large doppler shifts in frequency caused by relative motion between a collocated transceiver and a target or relative motion between separated transmitters and receivers. The system includes a tunable laser, a dithered laser optical frequency standard, and a computer for calculating the estimated doppler shift at a given time using platform navigation and attitude control inputs as well as inputs relating to pointing data controlling the direction of transmission. The frequency standard and the computer output are employed to develop a doppler compensation signal which may be used to shift the frequency of the laser transmitter or shift the bandpass of a laser receiver filter. The doppler compensation is provided by a feedback loop which may include r. f. components, a timing trigger from the computer, or wavemeters.

US Patent:

52550656, Oct 19, 1993

Filed:

Mar 10, 1992

Appl. No.:

7/848885

Inventors:

Geary Schwemmer - Hampstead MD

Assignee:

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

International Classification:

G01C 308
G02B 532

US Classification:

356 5

Abstract:

An optical scanning device utilizing a source of optical energy such as laser light backscattered from the earth's atmosphere or transmitted outward as in a lidar, a rotating holographic optical element having an axis of rotation perpendicular to the plane of its substrate, and having a stationary focus which may or may not be located on its axis of rotation, with the holographic optical element diffracting the source of optical energy at an angle to its rotation axis enabling a conical scanning area and a motor for supporting and rotating the rotating holographic optical element.