Study on the non-contact FBG vibration sensor and its application

Tianliang Li,Yuegang Tan,Li Cai,Kai Zheng,Zude Zhou,Sai Liu,Zhongting He

doi:10.1007/s13320-015-0220-9

Tianliang Li, Yuegang Tan + Show 5 more

Open Access

https://doi.org/10.1007/s13320-015-0220-9

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Journal: Photonic Sensors	Publication Date: Feb 14, 2015
Citations: 32	License type: CC BY 4.0

Affiliation: Wuhan University of Technology

Abstract

A non-contact vibration sensor based on the fiber Bragg grating (FBG) sensor has been presented, and it is used to monitor the vibration of rotating shaft. In the paper, we describe the principle of the sensor and make some experimental analyses. The analysis results show that the sensitivity and linearity of the sensor are −1.5 pm/μm and 4.11% within a measuring range of 2 mm–2.6 mm, respectively. When it is used to monitor the vibration of the rotating shaft, the analysis signals of vibration of the rotating shaft and the critical speed of rotation obtained are the same as that obtained from the eddy current sensor. It verifies that the sensor can be used for the non-contact measurement of vibration of the rotating shaft system and for fault monitoring and diagnosis of rotating machinery.

Highlights

Steam turbines, compressors, generators, and aviation engines are the principal rotating machinery
Electrical sensors are often used for rotating shaft vibration measurement, such as the eddy-current sensor and inductive sensor
The experimental system schematic diagram and the physical map are shown in Fig. 7, which is mainly composed of the PC, frequency transformer, variable frequency motor, gearbox, rotating shaft, eddy current sensor, non-contact fiber Bragg grating (FBG) vibration sensor, NI-DAQ cards, FBG interrogator, etc

Summary

Introduction

Compressors, generators, and aviation engines are the principal rotating machinery. They play an important role in the development of the modern industrialized process. Tianliang LI et al.: Research on the Non-Contact FBG Vibration Sensor and Its Application. FBG, used the cantilever beam as elastic body, and pasted FBGs on the surface of the cantilever beam to measure vibration [7, 8]; N. We make some theoretical and experimental analyses of the sensor, build a non-contact FBG vibration sensor experimental system and eddy current displacement sensor vibration measure system, and discuss the results. This paper describes the following aspects: principles and models of sensors, sensor calibration experiment, and multi-sensor vibration measuring experiment for the rotating shaft

Principle of FBG sensing

Working principle of the sensor

Principle and setup of the experiment

Analysis of experimental results

Conclusions