Optics: measuring and testing – By dispersed light spectroscopy – With internal standard comparison
Reexamination Certificate
2007-07-24
2007-07-24
Lauchman, Layla G. (Department: 2877)
Optics: measuring and testing
By dispersed light spectroscopy
With internal standard comparison
C356S300000, C250S205000, C374S100000
Reexamination Certificate
active
10978320
ABSTRACT:
A method and system for measuring heat energy of a combustible fluid in which light having wavelengths in the near-infrared is directed into a test cell containing the combustible fluid and portions of the light not absorbed by the combustible fluid and passing out of the cell are spatially dispersed by wavelength, forming a light spectrum that is projected onto a detector. The light spectrum is digitized and inputted into a data processing unit in which it is compared to the actual spectrum of the light source stored in the system to determine the absorbance spectrum of the combustible fluid. The system is spectrally calibrated by identifying known spectral features of the combustible gas absorbance spectrum. To correct for deviations in the original light source spectrum, a light source calibration system is employed. Upon determination of the absorbance spectrum of the combustible fluid, the heating value of the combustible fluid is determined by comparing the absorbance spectrum to a plurality of spectra located within an on-board database.
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Servaites James
Zelepouga Serguei
Fejer Mark E.
Gas Technology Institute
Lauchman Layla G.
Richey Scott M.
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