G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/31 (2006.01) G01N 21/39 (2006.01)
Patent
CA 2535090
A method for in-situ monitoring of an emission product includes transmitting a light, tuning the light to a first wavelength (40), receiving the light at a second location, varying the light from the first wavelength (40) to a second wavelength (42) during a first period, measuring a first absorption line (32) and a first non-absorbing baseline signal (34) during the first period, switching the light to a third wavelength (44), varying the light from the third wavelength (44) to a fourth wavelength (46) over a second period, and measuring a second absorption line (36) and a second non- absorbing baseline signal (35) during the second period. The light is transmitted from a first location by a tunable light source and received at a second location. The light passes along an optical path through the emission product between the first and second locations. The first wavelength (40) corresponds to the first absorption line (32) of the emission product. The third wavelength (44) is different from the first and second wavelengths (40, 42).
Company General Electric
Craig Wilson And Company
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