Device for measuring vibrations on rotating blade
First Claim
1. A device for measuring vibration of a blade rotating within a casing having a wall, comprising a probe having light-projecting and light receiving optical fibers, a lens made of quartz glass on a tip of the light projecting optical fiber, a second lens for directing light to said light receiving optical fiber, a protective glass made of quartz for said lenses, and an outer housing accommodating said lenses, optical fibers and protective glass, said housing being mounted on and extending through an outer surface of the wall of said casing for the rotating blade such that an inner end of said probe is directed towards a tip of said rotating blade to project a beam onto, said blade tip and receive reflections from said blade tip;
- means connected to said light receiving optical fiber for measuring deviations in said reflected beam due to vibration of said rotating blade;
channels for liquid coolant within said housing of said probe and through which liquid is fed back in reflux to cool said probe; and
an air channel for compressed air extending through said casing for the rotating blade to the interior thereof, the inner end of said probe communicating with said air channel for further cooling as said compressed air flows from said air channel onto said inner end and into said casing.
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Accused Products
Abstract
A device for measuring vibrations of a rotating blade of a gas turbine includes an optical probe that is mounted within a casing of the rotating blade. The probe includes a light projecting and a light receiving optical fiber along with associated focusing lenses and a protective glass. In addition, liquid coolant channels are provided within the probe housing and air coolant channels are provided within the blade casing in order to protect the probe from the hostile environment of the turbine.
35 Citations
2 Claims
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1. A device for measuring vibration of a blade rotating within a casing having a wall, comprising a probe having light-projecting and light receiving optical fibers, a lens made of quartz glass on a tip of the light projecting optical fiber, a second lens for directing light to said light receiving optical fiber, a protective glass made of quartz for said lenses, and an outer housing accommodating said lenses, optical fibers and protective glass, said housing being mounted on and extending through an outer surface of the wall of said casing for the rotating blade such that an inner end of said probe is directed towards a tip of said rotating blade to project a beam onto, said blade tip and receive reflections from said blade tip;
- means connected to said light receiving optical fiber for measuring deviations in said reflected beam due to vibration of said rotating blade;
channels for liquid coolant within said housing of said probe and through which liquid is fed back in reflux to cool said probe; and
an air channel for compressed air extending through said casing for the rotating blade to the interior thereof, the inner end of said probe communicating with said air channel for further cooling as said compressed air flows from said air channel onto said inner end and into said casing. - View Dependent Claims (2)
- means connected to said light receiving optical fiber for measuring deviations in said reflected beam due to vibration of said rotating blade;
Specification
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- Resources
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Current AssigneeIshikawajima-Harima Jukogyo Kabushiki Kaisha
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Original AssigneeIshikawajima-Harima Jukogyo Kabushiki Kaisha
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InventorsMinagawa, Nobuya, Wakatsuki, Takashi, Iinuma, Hideyasu
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Primary Examiner(s)Williams, Hezron E.
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Assistant Examiner(s)FAYYAZ, NASHMIYA SAQIB
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Application NumberUS07/846,086Time in Patent Office404 DaysField of Search73/655, 73/657, 73/660, 250/227.11, 250/227.20US Class Current73/655CPC Class CodesG01H 1/006 of the rotor of turbo machinesG01H 9/006 the vibrations causing a va...G01M 7/00 Vibration-testing of struct...
