Frederick Walter Clarke

US Patent:

7095555, Aug 22, 2006

Filed:

Aug 25, 2005

Appl. No.:

11/215201

Inventors:

Frederick W. Clarke - Madison AL, US
Saulius Balevicius - Vilnius, LT

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

H01S 3/082

US Classification:

359347, 372 27, 372 97

Abstract:

An apparatus for and a method of amplifying Faraday or Voigt rotation by passing light through a sample many times using multiple internal reflections and successive mirrored chambers that repeatedly send the light back through the sample. The sample is placed in a sample chamber that is adjacent to an optical amplifier chamber, and the optical amplifier chamber is adjacent to one or more additional chambers. The sample has a magnetic field applied thereto. The sample chamber receives light from a light source. The light reflects within the sample chamber and the sample to accumulate rotation of the light. The sample chamber transmits the light to the optical amplifier chamber. The optical amplifier chamber transmits the light to the additional chambers and reflects the light back to the sample where the light undergoes further rotation. Each one of the additional chambers transmits the light to the next additional chamber and reflects the light back to a previous chamber.

US Patent:

45979243, Jul 1, 1986

Filed:

Oct 21, 1985

Appl. No.:

6/789598

Inventors:

Henry C. Allen - Decatur AL
Frederick W. Clarke - Huntsville AL

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

C06B 2100

US Classification:

264 36

Abstract:

A process is disclosed for improving the mechanical properties and procesility of thermoplastic composite propellants achieved by incorporation in the propellant of from about 0. 1% to 1. 0% of an organic titanate of the general formula Ti(OR). sub. 4, where R represents a common alkyl group. The process comprises dissolving in an excess amount of a volatile organic solvent a thermoplastic elastomer which consists of hard segments having substantially crystalline properties and soft segments having substantially amorphous properties. The hard segments impart rigid properties to a solid propellant composition with which it is combined, and the soft segments imparting rubbery properties to a solid propellant composition with which it is combined. The Ti(OR). sub. 4 functions as a medium between the surface of the ammonium perchlorate (AP) oxidizer and the thermoplastic elastomer to improve processability and to provide a bonding substrate to enhance the adhesive bond between the AP and the thermoplastic elastomer.

US Patent:

52104176, May 11, 1993

Filed:

Feb 24, 1992

Appl. No.:

7/839627

Inventors:

John A. Grisham - Rogersville AL
Frederick W. Clarke - Madison AL
Charles R. Christensen - Athens AL
John L. Stensby - Madison AL

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

G01N 2121

US Classification:

2503381

Abstract:

A modulated Faraday rotation signal is produced by passing a linearly polarized laser beam through a semiconductor wafer sample in a modulated magnetic field that is induced in an electromagnet by a sine wave generator and driver coupled thereto. The rotation signal is normalized by dividing by a transmission signal produced by modulating the beam with a chopper that operates at a different frequency from the frequency of the driver. The result is a Faraday rotation measurement with high signal-to-noise ratio and compensation for laser drift in intensity.