Dual spectra optical pyrometer having an air pressure sensitive

Details Dual spectra optical pyrometer having an air pressure sensitive Dual spectra optical pyrometer having an air pressure sensitive

1985-11-14

1987-05-19

Laroche, Eugene R.

Optics: measuring and testing

Optical pyrometers

Plural color responsive

356 43, 374127, 350586, G01J 560

Patent

active

046662979

ABSTRACT:
A dual spectra optical pyrometer having an air pressure sensitive shutter for measuring the temperature of a turbine blade includes a sight tube located in the jet engine receiving an optical beam from the turbine blade. Located within the sight tube is a shutter responsive to the jet engine air pressure and providing the turbine blade optical beam only above a selected threshold magnitude of said air pressure. A detection module receives and divides the turbine blade optical beam and provides signals to a signal processor. From these signals and signals indicative of an estimated fireball equivalent black body temperature and the spectral width difference between the two detector signals, the signal processor provides a signal indicative of a compensated turbine blade temperature.

REFERENCES:
patent: 4222663 (1980-09-01), Gebhart et al.
patent: 4306835 (1981-12-01), Hurley
patent: 4326798 (1982-04-01), Kahn
patent: 4614050 (1986-09-01), Stevens
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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