John H Gruninger

US Patent:

7680337, Mar 16, 2010

Filed:

Feb 22, 2006

Appl. No.:

11/359681

Inventors:

John Gruninger - Boston MA, US
Steven Adler-Golden - Newtonville MA, US

Assignee:

Spectral Sciences, Inc. - Burlington MA

International Classification:

G06K 9/46
G06K 9/62
G01J 5/02

US Classification:

382191, 25033907, 382224

Abstract:

The invention provides a method for identifying one or more materials in a scene by determining a set of spectral vectors, called endmembers, from a data set comprised of spectra from the image data, and matching the set of endmembers to predefined library materials. The image data of the scene is captured with a sensor, and comprises a plurality of spectra. The method applies an iterative mathematical criterion, termed residual minimization, to find the endmembers. The first endmember may be selected based on the largest mean square value or the largest mean magnitude value. Subsequent endmembers are determined by calculating weighting factors, such that the weighting factors are non-negative and the calculated vector differences, or residuals, generate the smallest error metric. The error metric is dependent upon the vector difference between two spectra in the image data set, and may be the mean squared vector difference between two spectra.

US Patent:

6640199, Oct 28, 2003

Filed:

Oct 24, 2001

Appl. No.:

09/999807

Inventors:

Neil Goldstein - Belmont MA
John Gruninger - Boston MA
Fritz Bien - Concord MA
Jamine Lee - Burlington MA

Assignee:

Spectral Sciences, Inc. - Burlington MA

International Classification:

G01K 1130

US Classification:

702134, 702135, 702 28

Abstract:

A system and method for remotely determining at least one of the temperature of, and the relative concentrations of species making up, a hot fluid, based on the spectral structure of radiation emitted from the fluid. Thermal radiation over a field of view including the hot fluid is collected. At least a portion of the emission spectrum from the collected radiation is resolved. The resolved emission spectrum is resolved into spectra that are characteristic of specific emitting species and emitter temperatures. The temperature of, and the relative concentrations of species making up, the hot fluid, are determined from the relative amounts of at least two resolved spectra.