LASER DOPPLER DISTANCE SENSOR FOR FAST SHAPE MEASUREMENTS AT ROTATING OBJECTS

Jürgen Czarske, Thorsten Pfister, Lars Büttner

Abstract

For monitoring the shape of fast rotating objects such as turbo machine rotors, contactless and compact sensors with a high measurement rate as well as high precision are required. We present a novel laser Doppler distance sensor for shape measurements of rough technical surfaces. This novel sensor offers concurrently high distance resolution in the micron range and high temporal resolution in the microsecond range. Especially the distance measurement uncertainty is, in principle, independent of the lateral object velocity. In order to prove its operational capability shape measurements of fast rotating objects are demonstrated in comparison with conventional sensors.

Keywords

optical distance measurement, real-time shape measurement, tip-clearance of turbo machines

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IMEKO-WC-2009-TC14-383.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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