Tip timing measurement device and method based on optical fiber bundle probe

Abstract

The invention discloses a tip timing measurement device and method based on an optical fiber bundle probe. The tip timing measurement device comprises a blade tip, a light source, the optical fiber bundle probe, a first optical fiber bundle combiner, a second optical fiber bundle combiner, a first optical fiber loss device, a second optical fiber loss device, an optical fiber coupler, a photoelectric detector and a display terminal; light emitted by the light source enters an emitting optical fiber of the optical fiber bundle probe; and when the blade tip sweeps over the optical fiber bundle probe, the light is reflected by the blade tip and then received by a first circle of receiving optical fiber and a second circle of receiving optical fiber, the received light is converged to corresponding optical fibers through the first optical fiber bundle combiner and the second optical fiber bundle combiner, the coupling ratio is adjusted through the first optical fiber loss device and the second optical fiber loss device, optical signals are coupled into the photoelectric detector through the optical fiber coupler, the optical signals are converted into electric signals, and tip timing signals are obtained. Compared with a traditional optical fiber bundle probe, the tip timing precision under the condition of tip gap fluctuation is improved.

Description

technical field [0001] The invention belongs to the field of blade tip timing of turbine blades, and relates to a blade tip timing measurement device and method, in particular to a blade tip timing measurement device and method based on an optical fiber bundle probe. Background technique [0002] As a key component of engines and steam turbines, the health of turbine blades seriously affects the operation of machines and the safety of operators. Due to factors such as exciting force and thermal expansion, the turbine blades will be damaged or even broken, which will endanger the operation safety of the turbine engine. Therefore, real-time health monitoring of turbine blades is required. Tip timing measurement is a commonly used real-time monitoring measurement method, including capacitive, microwave, magnetoresistive, and fiber optic bundle methods. Among them, the fiber optic bundle probe has great application advantages due to factors such as high precision, fast response...

AI Technical Summary

Problems solved by technology

[0003]However, none of the current tip timing fiber optic sensors can solve the problem of tip timing error caused by tip clearance fluctuations

When measuring the tip timing, the received optical power varies drastically with the tip clearance, so the tip timing error caused by the fluctuation of the tip clearance is relatively large

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