Shroud contact wear sensor in a turbo machine

Optics: measuring and testing – By configuration comparison – With photosensitive film or plate

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Details

25055942, 356381, G01B 1108

Patent

active

054403952

ABSTRACT:
The present invention is for use in measuring the amount of wear of a shroud disposed on the inner surface of a casing in a turbo machine. A sensor body enclosing a half mirror and defining a purge air intake port is mounted to a shroud disposed on the inner surface of a casing as opposed to the tip of rotor blades. A small conical hole is formed in the shroud at the end of the sensor body. The sensor body is connected to an electronics section, including a light-emitting circuit and an image processing circuit, by a light-transmitting fiber optic cable and a light-receiving multi-core fiber optic cable respectively. The electronics section calculates the amount of wear of the shroud from the amount of light reflected from the surface defining the conical hole, an opening in the end of which varies in size as the shroud wears. Therefore, the amount of wear of the shroud surface is measured without being influenced by variations in temperature and the measurement is thus highly precise.

REFERENCES:
patent: 3806252 (1974-04-01), Harris et al.
patent: 3996668 (1976-12-01), Sharon
patent: 4687328 (1987-08-01), Shiraishi et al.
patent: 4916942 (1990-04-01), Davidson

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