James W Markham

US Patent:

6364524, Apr 2, 2002

Filed:

Apr 9, 1999

Appl. No.:

09/289407

Inventors:

James R. Markham - Middlefield CT

Assignee:

Advanced Fuel Research, Inc - East Hartford CT

International Classification:

G01J 500

US Classification:

374131, 374144

Abstract:

The high-speed radiation thermometer has an infrared measurement wavelength band that is matched to the infrared wavelength band of near-blackbody emittance of ceramic components and ceramic thermal barrier coatings used in turbine engines. It is comprised of a long wavelength infrared detector, a signal amplifier, an analog-to-digital converter, an optical system to collect radiation from the target, an optical filter, and an integral reference signal to maintain a calibrated response. A megahertz range electronic data acquisition system is connected to the radiation detector to operate on raw data obtained. Because the thermometer operates optimally at 8 to 12 m, where emittance is near-blackbody for ceramics, interferences to measurements performed in turbine engines are minimized. The method and apparatus are optimized to enable mapping of surface temperatures on fast moving ceramic elements, and the thermometer can provide microsecond response, with inherent self-diagnostic and calibration-correction features.

US Patent:

7151260, Dec 19, 2006

Filed:

Feb 27, 2004

Appl. No.:

10/789651

Inventors:

James R. Markham - Middlefield CT, US

Assignee:

Advanced Fuel Research, Inc. - East Hartford CT

International Classification:

G01J 5/02

US Classification:

25033908, 25033907, 25033906

Abstract:

Stand-alone multiple gas analysis apparatus, of relatively small physical size, integrates one or more supplemental sensors, such as a self-heating, amperometric, limiting current-type oxygen sensor and/or a titania nanotube-type hydrogen sensor, into the sampling cell gas flow components of an FT-IR gas analyzer. The apparatus enables simultaneous quantitative concentration measurements of infrared-active gases and of infrared-inactive atomic species and homonuclear diatomic molecules, such as of oxygen and hydrogen.

US Patent:

20040179575, Sep 16, 2004

Filed:

Jan 12, 2004

Appl. No.:

10/755424

Inventors:

James Markham - Middlefield CT, US

International Classification:

G01J005/00

US Classification:

374/121000, 374/130000

Abstract:

An on-engine radiation thermometer that simultaneously measures, through a common optical waveguide probe, long wavelength infrared radiation and short wavelength radiation, enables accurate temperature measurement and condition monitoring of ceramic thermal barrier coatings used on metal blades of gas turbine engines. This in turn enables operation at higher combustion temperatures, thereby optimizing coating use, and provides warning signals that are indicative of potential blade failure due to barrier coating spall and other conditions.

US Patent:

20070234730, Oct 11, 2007

Filed:

Oct 12, 2005

Appl. No.:

11/248448

Inventors:

James Markham - Middlefield CT, US
David Marran - Durham CT, US
James Scire - Vernon CT, US

International Classification:

G01N 21/61
F23N 5/14

US Classification:

060772000, 431013000

Abstract:

The sensor arrangement, performance-monitored machine system, and method, utilize radiance of exhaust streams to indicate performance deviation, due to combustion instability or machine malfunction, in propulsion gas turbine engines, augmentors used on such engines, stationary power generating gas turbine engines, and other air-breathing combustion-based turbine machines and systems. Sensor operation is based upon high-speed measurements of radiant emission from the hot exhaust stream, taken at a minimum rate of 2000, and preferably at a rate of at least 8000, samples per second. Select infrared wavelengths of light are used to capture temporal variations in the radiance, which are Fourier analyzed to determine the magnitude and frequency of the combustion instability. The apparatus and method enable detection of incipient combustion instability, combustion system health, power loss, stall, surge, and fuel light-off; information and feedback are available for combustion control, to provide an early warning and diagnosis of a physical and/or mechanical malfunction, and to indicate a need for condition-based maintenance.

US Patent:

52394883, Aug 24, 1993

Filed:

Apr 23, 1990

Appl. No.:

7/512422

Inventors:

James R. Markham - Middlefield CT
Philip W. Morrison - South Windsor CT
Peter R. Solomon - West Hartford CT
Philip E. Best - Mansfield Center CT

Assignee:

On-Line Technologies, Inc. - East Harford CT

International Classification:

G01N 2500

US Classification:

364557

Abstract:

The apparatus and method permit simultaneous and precise determination of the temperature and spectral emittance, over a wide spectral region, of a hot sample. Radiance, and hemispherical reflectance and transmittance measurements are employed, and FT-IR technology is advantageously applied. Reflectance and (where necessary) transmittance measurements are utilized to determine the fraction of incident radiation, of selected wavelength, that is absorbed by the sample, in turn establishing a spectral emittance value. Taken with the measured radiance at the same wavelength, the spectral emittance value will provide a quantity that can be matched with the spectral radiance of a theoretical black body, again at the selected wavelength, to thereby derive the temperature of the hot sample; this in turn enables determination of the spectral emittance of the sample over a desired spectral range.

US Patent:

20210128083, May 6, 2021

Filed:

Jul 13, 2020

Appl. No.:

16/927651

Inventors:

- East Hartford CT, US
Peter R. SOLOMON - West Hartford CT, US
Gordon A. DRUKIER - New Haven CT, US
Marek A. WOJTOWICZ - East Hartford CT, US
Joseph E. COSGROVE - Columbia CT, US
Michael A. SERIO - Sturbridge MA, US
James R. MARKHAM - Middlefield CT, US
Kenneth W. WANG - New York NY, US
William M. PRAMENKO - Burke VA, US

International Classification:

A61B 6/03
A61B 6/04
A61B 6/10
A61B 6/00
G21F 5/015

Abstract:

A medical imaging system for detecting ionizing radiation. The system includes one or more pixilated imagers positioned to acquire patient image data and one or more position sensors positioned to acquire patient position data. Once the patient image data and patient position data are acquired, one or more processors operably connected to each of the one or more pixilated imagers and one or more position sensors calculate a three-dimensional mass distribution based on patient image data and patient position data.

US Patent:

20190328342, Oct 31, 2019

Filed:

May 6, 2019

Appl. No.:

16/404342

Inventors:

- East Hartford CT, US
Peter R. SOLOMON - West Hartford CT, US
Gordon A. DRUKIER - New Haven CT, US
Marek A. WOJTOWICZ - East Hartford CT, US
Joseph E. COSGROVE - Columbia CT, US
Michael A. SERIO - Sturbridge MA, US
James R. MARKHAM - Middlefield CT, US
Kenneth W. WANG - New York NY, US
William M. PRAMENKO - Burke VA, US

International Classification:

A61B 6/03
A61B 6/10
A61B 6/04
A61B 6/00
G21F 5/015

Abstract:

A medical imaging system for detecting ionizing radiation. The system includes one or more pixilated imagers positioned to acquire patient image data and one or more position sensors positioned to acquire patient position data. Once the patient image data and patient position data are acquired, one or more processors operably connected to each of the one or more pixilated imagers and one or more position sensors calculate a three-dimensional mass distribution based on patient image data and patient position data.

US Patent:

20170319155, Nov 9, 2017

Filed:

May 9, 2017

Appl. No.:

15/590751

Inventors:

- East Hartford CT, US
Peter R. SOLOMON - West Hartford CT, US
Gordon A. DRUKIER - New Haven CT, US
Marek A. WOJTOWICZ - East Hartford CT, US
Joseph E. COSGROVE - Columbia CT, US
Michael A. SERIO - Sturbridge MA, US
James R. MARKHAM - Middlefield CT, US
Kenneth W. WANG - New York NY, US
William M. PRAMENKO - Burke VA, US

International Classification:

A61B 6/03
A61B 6/00
A61B 6/00
G21F 5/015

Abstract:

A medical imaging system for detecting ionizing radiation. The system includes one or more pixilated imagers positioned to acquire patient image data and one or more position sensors positioned to acquire patient position data. Once the patient image data and patient position data are acquired, one or more processors operably connected to each of the one or more pixilated imagers and one or more position sensors calculate a three-dimensional mass distribution based on patient image data and patient position data.