Patent ID: 8878133

Claim:
A probe assembly for measuring the concentration of exhaust emissions in a turbine engine, the probe assembly comprising: a first probe member configured and operable to generate a beam of light of constant wavelength upon thermal excitation of a component thereof, wherein the wavelength of the beam of light is contingent upon the configuration of the first probe member; and a second probe member positioned in the probe assembly to receive the beam of light generated by the first probe member, the second probe member configured and operable to absorb and attenuate the light generated from the first probe member with a peak absorption frequency that varies in accordance with the gaseous species present in the exhaust emissions of the turbine engine, wherein the constant wavelength of the first probe member is tuned to the peak absorption frequency of the second probe member so that more or less photons will be absorbed by the second probe member depending on how much of the gaseous species is present in the exhaust.