MULTIWAVELENGTH THERMOMETER

• US 20110128989A1
• Filed: 11/30/2009
• Published: 06/02/2011
• Est. Priority Date: 11/30/2009
• Status: Active Grant

• Current Assignee: Baker Hughes, a GE Company, LLC (Baker Hughes Company)
• Original Assignee: General Electric Company
• Inventors: Li, Hejie, Brown, Roderick Gordon, Walls, Stephen Thomas, Brown, Lesley Ellen, Wang, Guanghua, Wang, Anquan, Nirmalan, Nirm Velumylum, Dasgupta, Samhita, Furlong, Edward Randall
• Granted Patent: US 8,790,006 B2
• Time in Patent Office: Days
• US Class Current: 374/131
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0216 using light concentrators or collectors or condensers
• CPC Class Codes: G01J 3/0218 using optical fibers
• CPC Class Codes: G01J 3/28 Investigating the spectrum using colour filters G01J3/51
• CPC Class Codes: G01J 3/36 Investigating two or more bands of a spectrum by separate detectors
• CPC Class Codes: G01J 3/42 Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry beam switching arrangements G01J3/08
• CPC Class Codes: G01J 3/443 Emission spectrometry
• CPC Class Codes: G01J 5/0014 for sensing the radiation from gases, flames
• CPC Class Codes: G01J 5/0022 for sensing the radiation of moving bodies
• CPC Class Codes: G01J 5/0044 Furnaces, ovens, kilns G01J5/0007, G01J5/004 take precedence
• CPC Class Codes: G01J 5/0088 in turbines
• CPC Class Codes: G01J 5/08 Optical arrangements
• CPC Class Codes: G01J 5/0802 Optical filters
• CPC Class Codes: G01J 5/0815 Light concentrators, collectors or condensers
• CPC Class Codes: G01J 5/0821 Optical fibres
• CPC Class Codes: G01J 5/0846 having multiple detectors for performing different types of detection, e.g. using radiometry and reflectometry channels
• CPC Class Codes: G01J 5/58 using absorption; using extinction effect

Abstract

A thermal measurement system that includes a light collection device and a detection system in communication with the device. The detection system includes two detection subsystems, wherein one subsystem is configured to detect light from a surface of an object, while the other subsystem is configured to detect light from the surface and a gas. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.

Claims

1. A thermal measurement system comprising:

a light collection device;

a detection system in communication with the light collection device, the detection system comprising a first detection subsystem and a second detection subsystem, wherein the first detection subsystem is configured to detect light from a surface of an object, further wherein the second detection subsystem is configured to detect light from the surface and a gas.

2. The thermal measurement system of claim 1, wherein the thermal measurement system is configured to measure temperature of the surface of the object and the gas at substantially a same time.

3. The thermal measurement system of claim 1, wherein the object is one of a moving object, a stationary object, and combinations thereof.

4. The thermal measurement system of claim 3, wherein the moving object is one of a rotating object and a traversing object.

5. The thermal measurement system of claim 4, wherein the rotating object is a turbine blade.

6. The thermal measurement system of claim 3, wherein the stationary object is at least one hot gas path component of a gas turbine.

7. The thermal measurement system of claim 6, wherein the hot gas path component is one of a combustion liner, a turbine nozzle, a turbine stator, and a turbine afterburner.

8. The thermal measurement system of claim 1, wherein a temperature of the surface is between about 500°

F. and about 3000°

F.; and

, a temperature of the gas is between about 500°

F. and about 4000°

F.

9. The thermal measurement system of claim 1, wherein the gas comprises one of CO₂, H₂O, a hydrocarbon fuel, and combinations thereof.

10. The thermal measurement system of claim 1, wherein the light collection device is configured to collect light from one of:

a single point of the surface, a plurality of points in a one dimensional array of the surface, and a plurality of points in a two dimensional array of the surface.

11. The thermal measurement system of claim 1, further comprising at least one of a prism, a lens, a mirror, an optical fiber cable, and combinations thereof configured to provide light transmission between the light collection device and the detection system.

12. The thermal measurement system of claim 1, wherein a wavelength of the light is between about 0.5 μ

m and about 10 μ

m.

13. The thermal measurement system of claim 1, the detection system further comprises one of:

a de-multiplexer in communication with the first detection subsystem and the second detection subsystem; and

a light separator in communication with the first detection subsystem and the second detection subsystem, wherein the first detection subsystem and the second detection subsystem further include a dichroic mirror or a bandpass filter.

14. The thermal measurement system of claim 13, wherein the first detection subsystem and the second detection subsystem each comprise at least one of:

a plurality of detectors, a linear array, a camera, and combinations thereof.

15. The thermal measurement system of claim 1, wherein a detection range of the first detection subsystem is configured to minimize emission and absorption of the gas.

16. The thermal measurement system of claim 1, wherein a detection range of the second detection subsystem is configured to substantially match at least one wavelength range where the gas absorbs and emits light.

17. A thermal measurement system comprising:

a light collection device; and

a detection system in communication with the light collection device, wherein the detection system is configured to detect light intensity from a gas.

18. The thermal measurement system of claim 17, wherein the thermal measurement system is further configured to measure a temperature of the gas.

19. The thermal measurement system of claim 17, wherein the detection system is configured to detect light intensity from the gas in a wavelength range wherein the gas absorbs and emits light.

20. The thermal measurement system of claim 17, wherein a temperature of the gas is between about 500°

F. and about 4000°

F.

21. The thermal measurement system of claim 17, wherein the gas comprises one of CO₂, H₂O, a hydrocarbon fuel, and combinations thereof.

22. The thermal measurement system of claim 17, wherein the light collection device comprises a passive light collector.

23. The thermal measurement system of claim 17, wherein the light collection device is configured to collect light from a plurality of lines-of-sight.

24. The thermal measurement system of claim 17, further comprising an assembly configured to provide light transmission between the light collection device and the detection system, the assembly comprising at least one of a prism, a lens, a mirror, an optical fiber cable, and combinations thereof.

25. The thermal measurement system of claim 17, wherein a wavelength of detected light is between about 0.5 μ

m and about 10 μ

m.

26. The thermal measurement system of claim 17, the detection system further comprises one of:

a de-multiplexer in communication with the detection system; and

a light separator in communication with the detection system, wherein the detection system further includes a dichroic mirror or a bandpass filter.

27. The thermal measurement system of claim 17, wherein the detection system comprises one of a plurality of detectors, a linear array, a camera, and combinations thereof.

28. A method of directly measuring temperatures comprising:

collecting light through a gas from a surface of an object;

one of receiving and measuring a temperature of the surface of the object; and

measuring a temperature of the gas, based on the collected light and the temperature of the surface of the object.

29. The method of claim 28, wherein the measuring the temperature of the surface comprises determining a light intensity from light received from the surface of the object;

and,

the receiving the temperature of the surface comprises one of obtaining the temperature from a database, receiving the temperature from a third party, and precalculating the temperature.

30. The method of claim 28, the measuring the temperature of the gas comprises:

calculating a ratio between;

collected light intensity at wavelengths with minimum gas absorption and emission; and

collected light intensity at wavelengths with substantial gas absorption and emission.

31. The method of claim 30, the measuring the temperature of the gas further comprises applying an interpolation algorithm with a calculated database, wherein the ratio is a function of at least one of:

the temperature of the surface, the temperature of the gas, a pressure, and a composition of the gas.

32. A method of directly measuring a temperature comprising:

collecting light from a gas; and

measuring the temperature of the gas, based on the collected light.

33. The method of claim 32, the measuring comprises comparing an intensity of the collected light with a calculated database, wherein the intensity is a function of one of a temperature of the gas, a pressure, and a composition of the gas.

34. The method of claim 32, the measuring comprises applying an interpolation algorithm.

35. A computer program product stored on a computer readable medium for measuring temperatures, the computer readable medium comprising program code for performing the steps of:

collecting light through a gas from a surface of an object;

one of receiving and measuring a temperature of a surface of an object; and

measuring a temperature of the gas, based on the light and the temperature.

36. A method of deploying an application for measuring temperatures, comprising:

providing a computer infrastructure being operable to;

collect light through a gas from a surface of an object;

one of receive and measure a temperature of a surface of an object; and

measure a temperature of the gas, based on the light and the temperature.