Torsional Measurements Using an Optical non Contact Method
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United States of America Patent
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Issued Date -
Dec 28, 2017
app pub date -
Jun 28, 2016
filing date -
Jun 28, 2016
priority date (Note) -
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Abstract
A method to determine a characteristic on a turbine shaft is provided. The method includes disposing a reflective/absorptive target comprising a plurality of markings in a geometric pattern on the component. A light emitting source will then be focused onto a predetermined starting position on the target. The plurality of markings will linearly traverse across the light emitting source from the predetermined starting position. The reflected/absorbed light pulses from the plurality of markings will be detected and recorded. From the timing of the recorded light pulses, the characteristic of the component is determined. The geometric pattern comprises at least two non-parallel lines and a third line including the predetermined position. A system to determine a characteristic on a turbine shaft as well as a method to determine the torsional deflection of a turbine shaft are also provided.
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