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AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorsEdward A. Fisher, Keith L. Gehring
Estimating the term…
A gas turbine pyrometer filtering method and system uses a pyrometer to measure the high pressure turbine blade temperatures using infrared optical detection techniques. The pyrometer signal can be cluttered by positively biased noise. The turbine speed and the pyrometer electrical signal are alternately sampled by an analog to digital converter, and several revolutions of pyrometer data are stored in the local RAM. A data compression algorithm then selects single samples, at evenly spaced intervals, which results in a given number of revolutions, containing an exact number of data points of aligned data in RAM. This data is passed to a clutter rejection filter which then passes only the lowest value for each of the points in all revolutions of data. Thus, the revolutions of acquired data are reduced into a single revolution of filtered data for the current sampling. This single revolution of filtered data in then enter into a circular queue and the last element is discarded. The data is then passed through a second clutter rejection filter, and the output is a smooth temperature profile of the turbine blades, free of clutter.
In a system for measuring the temperature of the rotating blades of a turbine in a gas turbine engine, said system including a pyrometer for generating analog electrical signals proportional to the temperature detected at said rotating turbine, said electrical signals containing both desired signals and undesired noise, a system for filtering positively biased undesired noise from said electrical signals, said filtering system comprising:
A method for measuring the temperature of the rotating blades in a gas turbine engine in the presence of positively biased noise, the steps comprising:
A method for measuring the temperature of the rotating blades in a gas turbine engine in the presence of positively biased noise, comprising the steps of:
Dependencies are inferred from the claim text.