13 October 1999 High-temperature high-precision casing-mounted optical sensors for in-situ measurement of blade vibration in rotating turbo machinery
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Abstract
This study first describes the construction of casing- mounted single core fiber optic sensors for in-situ vibration measurement by blade tip timing. The design enables efficient use of light flux in a stand-off configuration, suitable for application in high temperature turbines. A description of laboratory experiments then follows showing how very high precision timing can be achieved by cross correlation of repeating speckle signatures from the blade tips. This has enabled the relative position of blade tips to be determined to better than +/- 2 micrometers when the maximum rotational speed was 4000 rpm. The requirements of an optoelectronic system for use at higher speeds and with the same precise timing is evaluated.
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Michael M. Ross, Michael M. Ross, Dennis Crommentuijn-Marsh, Dennis Crommentuijn-Marsh, } "High-temperature high-precision casing-mounted optical sensors for in-situ measurement of blade vibration in rotating turbo machinery", Proc. SPIE 3783, Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids, (13 October 1999); doi: 10.1117/12.365757; https://doi.org/10.1117/12.365757
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