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Rapid Scanning Infrared/Near Infrared Spectrometer. Phase 2. SBIR. Final Report.

pdf icon Rapid Scanning Infrared/Near Infrared Spectrometer. Phase 2. SBIR. Final Report. (2038 K)
Sivathanu, Y. R.; Joseph, R.; Lim, J.; Zheng, Y.; Gore, J. P.

NIST GCR 99-777; 28 p. September 1999.


National Institute of Standards and Technology, Gaithersburg, MD

Available from:

National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161.
Telephone: 1-800-553-6847 or 703-605-6000;
Fax: 703-605-6900.
Order number: PB99-176851


infrared spectrometers; algorithms; fire research; gas temperature; image intensifiers; laminar flames; measurements


This Phase 2 SBIR project report covers the development of a 2-D imaging spectrometer for the determination of the local gas species concentrations and temperatures from a laminar flame, and its extension for commercial application as a gas temperature sensor. Three separate tasks were undertaken during the Phase 2 work. The first task was the development of an optimized algorithm and hardware design to obtain gas temperatures from a high frequency multi-wavelength sensor. The second task was the development of an imaging spectrometer to obtain spectral radiation intensities along a horizontal plane from a laminar diffusion flame. The third task was the development of a deconvolution algorithm to obtain gas species concentrations and temperatures from the spectral radiation intensity measurements. Based on the Phase 2 research, the following results were obtained. A robust algorithm for determining the gas temperatures at the inlet of a natural gas turbine engine, from measurements of infrared radiation intensities, was developed, evaluated and licensed for commercial production. A study of the different methods of obtaining infrared radiation intensities for a turbine-inlet gas temperature sensor was completed. A prototype 2-D infrared imaging spectrometer was designed, fabricated and delivered to the National Institute of Standards and Technology. A deconvolution algorithm to obtain local radiation intensities from path integrated measurements was developed and evaluated. The 2-D imaging spectrometer was used to obtain spectrally and spatially resolved infrared radiation intensities in a laminar natural gas'diffusion flame. The deconvolution algorithm was used to obtain the local intensities in the laminar natural gas diffusion flame. Reasonable estimates of temperatures were obtained from the local intensities. The estimates of gas concentrations were less satisfactory. The major reason for this behavior is the lack of reliable wavelength calibration. Steps to remedy this are in progress. A new company called Spectraline Inc. has been started to market the 2-D imaging spectormeter developed during the Phase 2 research.