Method and apparatus for spatially resolving flame temperatures using ultraviolet light emission

• US 6,914,246 B2
• Filed: 03/27/2003
• Issued: 07/05/2005
• Est. Priority Date: 03/27/2003
• Status: Expired due to Term

• Current Assignee: Gas Technology Institute (GTI Energy)
• Original Assignee: Gas Technology Institute (GTI Energy)
• Inventors: Zelepouga, Serguei, Servaites, James
• Primary Examiner(s): Porta, David
• Assistant Examiner(s): Sung, Christine
• Application Number:
  US10/400,887
• Publication Number:
  US 20040188620A1
• Time in Patent Office: 831 Days
• Field of Search: 250/339.15, 250/339.14, 250/339.01, 250/338.1, 250/336.1
• US Class Current: 250/339.15
• CPC Class Codes: G01J 5/0014 for sensing the radiation from gases, flames

Abstract

A method for spatially resolving flame temperatures in which a temperature-dependent wavelength region of a molecule radical spectrum and a normalization wavelength region of the molecule radical spectrum suitable for normalizing spectral data are identified. An algorithm based upon a relationship between a temperature-dependent intensity range within the temperature-dependent wavelength region at a plurality of temperatures and a normalized intensity range within the normalization wavelength region is formulated. Flame spectral data from a flame is obtained and the algorithm is applied to the flame spectral data, resulting in generation of a flame temperature profile of the flame.

Claims

1. A method for spatially resolving flame temperatures comprising the steps of:

identifying a first normalized intensity range of a spectrum of a molecule radical, said first normalized intensity range remaining substantially constant in value with changes in temperature;

identifying a second normalized intensity range of said spectrum, said second normalized intensity range changing in value with said changes in temperature and resulting substantially only from one of rotational and vibrational energy of said molecule radical;

determining a ratio of said second normalized intensity range to said first normalized intensity range at a plurality of temperatures, resulting in generation of an algorithm;

detecting a pattern of light intensities generated by said molecule radical in a flame at a wavelength corresponding to said second normalized intensity range; and

applying said algorithm to said pattern of light intensities, resulting in generation of a flame temperature profile for said flame.

2. A method in accordance with claim 1, wherein said molecule radical is selected from the group consisting of OH, CH, C₂ and mixtures thereof.

3. A method in accordance with claim 1, wherein said pattern of light intensities is detected by a CCD detector.

4. A method in accordance with claim 1, wherein said first normalized intensity range and said second normalized intensity are acquired using at least two narrow band-pass filters.

5. A method in accordance with claim 1, wherein said flame is a hydrocarbon flame.

6. A method in accordance with claim 1, wherein said flame is a non-hydrocarbon flame.

7. A method in accordance with claim 1, wherein said flame temperature profile is output to control means for controlling said flame.

8. A method in accordance with claim 1, wherein said flame temperature profile is output to a visual display.

9. A method in accordance with claim 1, wherein said wavelengths are in at least one of an ultraviolet range and a near-ultraviolet range.

10. A method in accordance with claim 9, wherein said wavelengths are in a range of about 250 nm to about 500 nm.

11. A method for spatially resolving flame temperatures comprising the steps of:

identifying a temperature-dependent wavelength region of a molecule radical spectrum;

identifying a normalization wavelength region of said molecule radical spectrum suitable for normalizing spectral data;

formulating an algorithm based upon a relationship between a temperature-dependent intensity range within said temperature-dependent wavelength region at a plurality of temperatures and a normalized intensity range within said normalization wavelength region;

obtaining flame spectral data from a flame; and

applying said algorithm to said flame spectral data, resulting in generation of a flame temperature profile of said flame.

12. A method in accordance with claim 11, wherein said temperature-dependent wavelength region and said normalization wavelength region are in a range of about 250 nm to about 500 nm.

13. A method in accordance with claim 11, wherein said flame is a hydrocarbon flame.

14. A method in accordance with claim 11, wherein said flame is a non-hydrocarbon flame.

15. A method in accordance with claim 11, wherein said molecule radical spectrum comprises spectral data from a molecule radical selected from the group consisting of CH, OH, C₂ and mixtures thereof.

16. A method in accordance with claim 11, wherein said molecule radical spectrum comprises spectral from a molecule injected into said flame.

17. A method in accordance with claim 11, wherein said flame temperature profile is output to control means for controlling said flame.

18. A method in accordance with claim 11, wherein said flame temperature profile is output to a visual display.