Radiant energy – Radiation tracer methods – Radioactive tracer methods
Patent
1987-01-16
1988-05-24
Church, Craig E.
Radiant energy
Radiation tracer methods
Radioactive tracer methods
2503561, 250308, 250363S, G01T 116, G21H 502
Patent
active
047467959
ABSTRACT:
A representation of oil flow in a gas turbine engine is obtained by injecting a compatible radioactive isotope label into the engine oil flow and detecting the radiation emitted from within the body with detectors mounted outside the body to produce signals representative of the quantity and direction of the radiation; the detector output signals are compensated for attenuation on passing through the engine in accordance with attenuation signals derived from a representation of the spatial distribution of the engine and of its materials, and signals from non-viable directions are discounted. The compensated detector output signals are used to generate a number of focal-plane tomograms from which an image in a desired plane may be re-constructed. The image may be formed on a background of the engine in the relevant plane generated from the representation thereof. The injection of radio-active label and the detector output signals may be pulsed to produce a strobed image from which velocity measurements can be obtained.
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Hawkesworth Michael R.
Stewart Peter A. E.
Witcomb Roger C.
Berman Jack I.
Church Craig E.
Rolls-Royce plc
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