Multiwavelength thermometer

• US 8,790,006 B2
• Filed: 11/30/2009
• Issued: 07/29/2014
• Est. Priority Date: 11/30/2009
• Status: Expired due to Fees

• Current Assignee: Baker Hughes, a GE Company, LLC (Baker Hughes Company)
• Original Assignee: General Electric Company
• Inventors: Li, Hejie, Dasgupta, Samhita, Furlong, Edward Randall, Nirmalan, Nirm Velumylum, Wang, Anquan, Wang, Guanghua, Walls, Stephen Thomas, Brown, Rodrick Gordon
• Primary Examiner(s): Jagan, Mirellys
• Application Number:
  US12/627,293
• Publication Number:
  US 20110128989A1
• Time in Patent Office: 1,702 Days
• Field of Search: 374/130, 374/120, 374/161, 374/144, 374/166, 374/148
• US Class Current: 374/130
• 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:

an optical system configured to collect light emitted from a surface of an object and emitted from a gas;

a detection system configured to receive the light collected by the optical system, the detection system comprising a first detection subsystem and a second detection subsystem, wherein the first detection subsystem is configured to detect the light emitted from the surface of the object, further wherein the second detection subsystem is configured to detect the light emitted from the surface of the object and the gas, wherein at least one of;

a detection range of the first detection subsystem is configured to minimize emission and absorption of the gas; and

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.

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

3. 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.

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

5. The thermal measurement system of claim 1, wherein the optical system is configured to receive 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.

6. 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 optical system and the detection system.

7. The thermal measurement system of claim 1, wherein a wavelength of the light collected by the optical system is between about 0.5 μ

m and about 10 μ

m.

8. The thermal measurement system of claim 7, further wherein the wavelength of the light collected by the optical system is between about 4.0 μ

m and about 5.0 μ

m.

9. 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.

10. The thermal measurement system of claim 9, wherein the detection system comprises at least one of:

a single detector, a plurality of detectors, an array of detectors, and a camera.

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

12. The thermal measurement system of claim 11, wherein the stationary object is at least one hot gas path component of a gas turbine.

13. The thermal measurement system of claim 12, wherein the hot gas path component is one of a combustion liner, a turbine nozzle, a turbine stator, and a turbine afterburner.

14. The thermal measurement system of claim 11, wherein the moving object is one of a rotating object and a traversing object.

15. The thermal measurement system of claim 14, wherein the rotating object is a turbine blade.