In-flight engine control optical pyrometer

Details In-flight engine control optical pyrometer In-flight engine control optical pyrometer

1985-11-14

1987-04-14

LaRoche, Eugene R.

Optics: measuring and testing

Optical pyrometers

Plural color responsive

356 43, 374127, G01J 560

Patent

active

046573860

ABSTRACT:
A novel dual spectra optical pyrometer for use in in-flight control of jet engines includes an optical probe containing a shutter sensitive to the air pressure within the jet engine. The shutter provides an optical beam from rotating turbine blades to an optical fiber only above a threshold pressure. A serial array of photodetectors receives the optical beam and provides first and second signals therefrom. A signal processor receives the first and second signals as well as signals indicative of the energy ratio therebetween, and provides reflection corrected energy signals from the difference between the first signals and the product of the energy ratio signals and the second signals.

REFERENCES:
patent: 4222663 (1980-09-01), Gebhart et al.
patent: 4326798 (1982-04-01), Kahn
T. G. R. Beynon, "Radiation Thermometry Applied to the Development and Control of Gas Turbine Engines", American Institute of Physics, 1982, pp. 471-477.
W. H. Atkinson, R. R. Strange, "Pyrometer Temperature Measurements in the Presence of Reflected Radiation", Proceedings of the Conference of the American Society of Mechanical Engineers, Aug. 1976, pp. 1-8.

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