Radiant energy – Invisible radiant energy responsive electric signalling – Flow metering
Patent
1980-05-05
1982-07-06
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
Flow metering
250303, 250435, 364510, G01F 100
Patent
active
043385206
ABSTRACT:
In order to produce a visual image on a screen of the movement of gas flows inside hollow bodies, e.g. gas turbine or internal combustion engines, or wind tunnels, a gaseous tracer material including a short-lived radio-active isotope is injected into the hollow body. Radiation detectors 32 are positioned around a gas turbine engine 10 and linked to a computer 36 which is programmed using an image reconstruction algorithm to reconstruct the flow path of the isotope in suitable form. One suitable isotope is produced by irradiating carbon tetrafluoride using a stream of deuterons from a cyclotron 12. The resulting reaction produces an isotope of Fluorine which has a half-life of 11.56 seconds, and decays producing radiation at approximately 1.6 Mev. The activity of the isotope is raised to the highest feasible level by continuously irradiating the tracer material in a chamber 14 as it is pumped around a circuit prior to injection. The half lives of the isotopes used are in the range 3 seconds to 2 minutes.
REFERENCES:
patent: 2841713 (1958-07-01), Howard
patent: 2968721 (1961-01-01), Shapiro et al.
patent: 4057720 (1977-11-01), Paap et al.
patent: 4161655 (1979-07-01), Cotic et al.
Rolls Royce Limited
Willis Davis L.
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