Chung Wan Lee

US Patent:

7526397, Apr 28, 2009

Filed:

Mar 13, 2007

Appl. No.:

11/685628

Inventors:

Kent Kalar - Austin TX, US
Michael E. Sanders - Austin TX, US
Chung Lee - College Station TX, US
Brian Park - Austin TX, US
Mohammed Fassih-Nia - Austin TX, US

Assignee:

SensorTran, Inc. - Austin TX

International Classification:

G01K 15/00

US Classification:

702 99

Abstract:

Systems and methods for calibrating a temperature sensing system are disclosed. In one respect, a line may be placed in operative relation with a first reference cell and a second reference cell. The temperatures of the first and second reference cells may be adjusted. In one non-limiting example, the temperature of the first reference cell may be adjusted to a temperature above an ambient temperature and the temperature of the second reference cell may be adjusted to a temperature below an ambient temperature. The temperature sensing system may be calibrated based on the temperature data of the first and second reference cells.

US Patent:

7628533, Dec 8, 2009

Filed:

Oct 22, 2007

Appl. No.:

11/876511

Inventors:

Chung E. Lee - Austin TX, US
William Hallidy - Austin TX, US

Assignee:

SensorTran, Inc - Austin TX

International Classification:

G01N 25/00
G01J 5/00
G01K 11/00

US Classification:

374 7, 374121, 374161, 374131, 374 45

Abstract:

Systems and methods for detecting corrosion are provided. In one embodiment, a luminescent material coupled to a cladding of an optical fiber may be altered when exposed to corrosion. The backscatter emission of the luminescent material, which includes the altered optical properties, may be used to determine properties of the corrosion including, for example, thickness, or location of the corrosion.

US Patent:

7668412, Feb 23, 2010

Filed:

Oct 22, 2008

Appl. No.:

12/288663

Inventors:

Chung Lee - Austin TX, US
Kent Kalar - Austin TX, US

Assignee:

Sensor Tran, Inc - Austin TX

International Classification:

G02B 6/00
G01N 25/00

US Classification:

385 12, 25022718, 374 7

Abstract:

A distributed sensing system for detecting partial electric discharge along the length of an extended object or objects. An optical fiber having a cladding integrated with luminescent material and a silica core of less than 500 micro-meters in diameter with a first reflective end deployed in proximity to test objects. A photo detector is positioned at the second end of the optical sensing fiber and receives and measures both a direct emission light from an electric partial discharge event and the reflected emission light from the reflection end of the optical sensing fiber. The measured signals and their arrival times are used to determine the location and magnitude of a partial electrical discharge.

US Patent:

8333505, Dec 18, 2012

Filed:

Jan 17, 2009

Appl. No.:

12/735356

Inventors:

Chung Lee - Austin TX, US
Kent Kalar - Sunset Valley TX, US
Mahesh Ajgaonkar - Buda TX, US
Michael Sanders - Austin TX, US

Assignee:

SensorTran, Inc. - Austin TX

International Classification:

G01K 3/00

US Classification:

374137

Abstract:

Systems and methods for extending the range of a fiber optic DTS system are provided. In one respect, a method may provide steps for transmitting, in a first time period, an optical signal at a first energy level through an optical fiber, collecting backscatter signals as a result of the first transmission, adjusting the first energy level to a second energy level, transmitting, in an additional time period, the adjusted optical signal through the optical fiber, collecting backscatter signals as a result of the adjusted transmissions, and using a portion of the collected backscatter as a result of the first transmission and a portion of the collected backscatter as a result of the additional transmissions, determining one or more parameter profiles, such as a temperature profile.

US Patent:

8414186, Apr 9, 2013

Filed:

Jul 18, 2008

Appl. No.:

12/451866

Inventors:

Chung Lee - Austin TX, US
Kwang Suh - Lakeway TX, US
Mahesh Ajgaonkar - Buda TX, US
Kent Kalar - Austin TX, US

Assignee:

SensorTran, Inc. - Austin TX

International Classification:

G01K 1/00
G01K 3/06
G01J 5/08
G02B 6/036

US Classification:

374130, 374131, 374161, 374 45, 374208, 374137, 356 43

Abstract:

A new step-index multimode pure silica core fiber for DTS (Distributed Temperature Sensing) system particularly useful for downhole environments is disclosed and described. The new sensor system provides optimum tradeoffs between coupling power, spatial resolution, and temperature resolution.

US Patent:

8496376, Jul 30, 2013

Filed:

Jul 7, 2008

Appl. No.:

12/451865

Inventors:

Chung Lee - Austin TX, US
Kwang Suh - Lakeway TX, US

Assignee:

SensorTran, Inc. - Austin TX

International Classification:

G01K 15/00
G01K 11/00
G01K 3/00
G01J 5/00

US Classification:

374161, 374 1, 374130, 374121, 374137, 374124

Abstract:

An automatic and continuous method is presented to improve the accuracy of fiber optic distributed temperature measurements derived from Raman back scatterings utilizing two light sources with different wavelengths, by choosing the wavelengths of the two sources so the primary source's return anti-Stokes component overlaps with the incident wavelength of the secondary light source thereby canceling out the non-identical attenuations generated by the wavelength differences between Stokes and anti-Stokes bands.

US Patent:

20110231135, Sep 22, 2011

Filed:

Sep 25, 2009

Appl. No.:

12/998200

Inventors:

Kwang Suh - Lakeway TX, US
Kent Kalar - Sunset Valley TX, US
Chung Lee - Austin TX, US
Michael Sanders - Austin TX, US

International Classification:

G01K 15/00
G06F 19/00

US Classification:

702 99, 374 1, 374E15001

Abstract:

An automatic auto-correcting method is presented to improve the accuracy of fiber optic distributed temperature measurements derived from Raman back scatterings utilizing two light sources with different wavelengths, by appropriate choice of the wavelengths of the two sources, the use of single pulse modulating circuit for the two light sources, and use of one of the light sources as a primary measurement system and the second light source as an occasional correcting source.

US Patent:

57566488, May 26, 1998

Filed:

Oct 25, 1995

Appl. No.:

8/548282

Inventors:

Chung J. Lee - Austin TX

Assignee:

Tamarack Storage Devices, Inc. - Austin TX

International Classification:

C08G 7310
C08L 7700

US Classification:

528353

Abstract:

Photosensitive polyimides (Ps-PIM) materials have been synthesized that belong to three families of Ps-PIM materials. Through the use of precursors, various catalytic compositions with differing photosensitivities are provided. The results are Ps-PIM materials having increased photosensitivities at wavelengths longer than approximately 330 to 350 nm and an associated catalytic system that is insensitive to oxygen. A variety of applications, including use in holographic systems, are improved by the present invention.