Joseph J Demers

US Patent:

7430081, Sep 30, 2008

Filed:

May 17, 2002

Appl. No.:

10/150183

Inventors:

Nathan G. Woodard - Pasadena CA, US
Eric C. Johnson - Altadena CA, US
Jon F. Nielsen - Los Angeles CA, US
Joseph R. Demers - Pasadena CA, US
Chien-Chung Chen - Thousand Oaks CA, US

Assignee:

Emcore Corporation - Somerset NJ

International Classification:

G02B 7/02

US Classification:

359814, 359819

Abstract:

An optical assembly includes a light path and at least one optic to be positioned in the path. A support arrangement supports the optic having a foot arrangement including at least one foot that receives a direct manipulation with the foot slidingly engaged against a support surface to move the optic relative to the light path. Movement of the foot may move the optic along a predetermined path. The foot defines a footprint for engaging the support surface and receives the direct manipulation in a way which changes the footprint on the support surface to move the optic responsive to changes in the footprint. A movement arrangement may selectively bias the foot against the support surface during a movement mode, intended to permit movement of the foot against the support surface, and in a locked mode, intended to lock the foot against the support surface.

US Patent:

7508390, Mar 24, 2009

Filed:

Aug 17, 2004

Appl. No.:

10/921019

Inventors:

Joseph E. Demers - Palo Alto CA, US

Assignee:

NVIDIA Corporation - Santa Clara CA

International Classification:

G06T 15/40

US Classification:

345426, 345422

Abstract:

A method for rendering a shadow in a 3 D scene includes generating a penumbra map using a z-buffer and generating an occluder map using the z-buffer. The penumbra map and the occluder map are projected into a 3 D scene to render at least one shadow having a penumbra region and an umbra region.

US Patent:

7672068, Mar 2, 2010

Filed:

Aug 26, 2008

Appl. No.:

12/198452

Inventors:

Nathan G. Woodard - Pasadena CA, US
Eric C. Johnson - Altadena CA, US
Jon F. Nielsen - Los Angeles CA, US
Joseph R. Demers - Pasadena CA, US
Chien-Chung Chen - Thousand Oaks CA, US

Assignee:

Emcore Corporation - Albuquerque NM

International Classification:

G02B 7/02

US Classification:

359814, 359809

Abstract:

An optical assembly includes a light path and at least one optic to be positioned in the path. A support arrangement supports the optic having a foot arrangement including at least one foot that receives a direct manipulation with the foot slidingly engaged against a support surface to move the optic relative to the light path. Movement of the foot may move the optic along a predetermined path. The foot defines a footprint for engaging the support surface and receives the direct manipulation in a way which changes the footprint on the support surface to move the optic responsive to changes in the footprint. A movement arrangement may selectively bias the foot against the support surface during a movement mode, intended to permit movement of the foot against the support surface, and in a locked mode, intended to lock the foot against the support surface.

US Patent:

7781736, Aug 24, 2010

Filed:

May 13, 2009

Appl. No.:

12/465219

Inventors:

Joseph R. Demers - Alhambra CA, US

Assignee:

Emcore Corporation - Albuquerque NM

International Classification:

G01N 21/21
G01N 21/25
G01J 5/02

US Classification:

25033907, 2503381, 2503411, 356460, 356462

Abstract:

An apparatus for analyzing, identifying or imaging an target including an integrated dual laser module coupled to a pair of photoconductive switches to produce cw signals in the range of frequencies from 100 GHz to over 2 THz focused on and transmitted through or reflected from the target; and a detector for acquiring spectral information from signals received from the target and using a multi-spectral homodyne process to generate an electrical signal representative of some characteristics of the target with resolution less than 250 MHz. The photoconductive switches are activated by laser beams from the dual laser module. The lasers in the module are tuned to different frequencies and a phase shifter in the path of one beam allows the beams to have an adjustable phase difference.

US Patent:

7936453, May 3, 2011

Filed:

Apr 4, 2008

Appl. No.:

12/062772

Inventors:

Joseph R. Demers - Alhambra CA, US
Bryon L. Kasper - San Marino CA, US

Assignee:

Emcore Corporation - Albuquerque NM

International Classification:

G01N 21/21

US Classification:

356300, 356326, 25033907

Abstract:

An apparatus for analyzing, identifying or imaging a target including an integrated dual laser module coupled to a pair of photoconductive switches to produce CW signals in the range of frequencies from 100 GHz to over 2 THz focused on and transmitted through or reflected from the target; and a detector for acquiring spectral information from signals received from the target and using a multi-spectral homodyne process to generate an electrical signal representative of some characteristics of the target with resolution less than 250 MHz. The photoconductive switches are activated by laser beams from the dual laser module. The lasers in the module are tuned to different frequencies and have two distinct low frequency identification tones respectively that are used in conjunction with a stable optical filter element to permit precise determination of the offset frequency of the lasers.

US Patent:

8193503, Jun 5, 2012

Filed:

Dec 9, 2009

Appl. No.:

12/634422

Inventors:

Joseph R. Demers - Alhambra CA, US

Assignee:

Emcore Corporation - Albuquerque NM

International Classification:

G01J 5/02

US Classification:

2503418

Abstract:

Disclosed herein are methods of detecting organic materials, and more particularly, methods of detecting organic materials using terahertz spectroscopy. The method of detecting organic material using terahertz spectroscopy includes suspending organic material in a medium to form a sample; irradiating the sample with an illumination beam of electromagnetic radiation, the illumination beam having a plurality of frequencies in the range of about 100 GHz to about 2 THz; detecting radiation transmitted through and/or reflected from the sample; and, analyzing the detected radiation to identify the organic material, wherein the medium is selected from the group consisting of agar, guar gum, gellan gum, carrageenan, xantham gum, fibrous sodium pectate, and other agar substitutes.

US Patent:

8243375, Aug 14, 2012

Filed:

Jan 18, 2010

Appl. No.:

12/689188

Inventors:

Nathan G. Woodard - Pasadena CA, US
Eric C. Johnson - Altadena CA, US
Jon F. Nielsen - Los Angeles CA, US
Joseph R. Demers - Pasadena CA, US
Chien-Chung Chen - Thousand Oaks CA, US

Assignee:

Emcore Corporation - Albuquerque NM

International Classification:

G02B 7/02

US Classification:

359811, 359813

Abstract:

An optical assembly includes a light path and at least one optic to be positioned in the path. A support arrangement supports the optic having a foot arrangement including at least one foot that receives a direct manipulation with the foot slidingly engaged against a support surface to move the optic relative to the light path. Movement of the foot may move the optic along a predetermined path. The foot defines a footprint for engaging the support surface and receives the direct manipulation in a way which changes the footprint on the support surface to move the optic responsive to changes in the footprint. A movement arrangement may selectively bias the foot against the support surface during a movement mode, intended to permit movement of the foot against the support surface, and in a locked mode, intended to lock the foot against the support surface.

US Patent:

20030196992, Oct 23, 2003

Filed:

Mar 20, 2003

Appl. No.:

10/394326

Inventors:

Joseph Demers - Pasadena CA, US
Nathan Woodard - Pasadena CA, US
Eric Johnson - Altadena CA, US
Chien-Chung Chen - Thousand Oaks CA, US
Ronald Logan - Pasadena CA, US

International Classification:

B23K011/00

US Classification:

219/117100, 219/086900

Abstract:

Attaching an attachment surface of an electrically conductive workpiece to an electrically conductive support surface is described. In one aspect, a biasing force is distributed at least partially around a weld region of the workpiece to urge the attachment surface of the workpiece against the support surface in a way which at least resists welding induced movement of the workpiece relative to the support arrangement. An electrode arrangement, having an electrode tip, contacts the workpiece to provide for substantially compliant movement of the electrode tip against the weld region in directions that are parallel to the support surface. In another aspect, a combined manipulation/welding arrangement is supported for controlled movement with a free end configured for engaging the workpiece to bias the workpiece against the support surface to manipulate the workpiece against the surface and to conduct an electrical current, while holding the workpiece, for welding to the support surface.