Design of vibration sensor based on fiber Bragg grating

Abstract

Fiber grating is a kind of new type of fiber optic light source device which has been rapidly changing in the refractive index of the core in recent years. Especially, it can realize the high precision of the external parameters by means of the special structure design and the encapsulation technology [1,2]. In this paper, a fiber grating vibration sensor which is suitable for vibration monitoring in key areas is designed based on the technical background of vibration monitoring system. The sensor uses a single beam structure and pastes the fiber Bragg grating (FBG) to measure the vibration wavelength on the surface. When the vibration is simply harmonic vibration, the Bragg reflection wavelength will change periodically, and the periodic variation of the wavelength curve can be measured by the fiber grating demodulator, then the correctness of the experimental results is verified. In this paper, through the analysis of the data measured by the demodulator, the MATLAB software is used to verify the data, and the different frequency domains, the modes, and the phase frequency curves are obtained. The measurement range is 0 Hz -100 Hz, and the natural frequency is 90.6 Hz.

Optical method for monitoring the state of dynamic objects in the processing of materials

“…This makes further development of methods and systems necessary in connection with the search for possible extensions of the functional properties of integrated technical optoelectronic means. Thus, for example, studies of sensors based on Bragg gratings are known 6 , which allow the development of optical systems using optical fiber elements. A variant of constructing a hybrid sensor 7,8 , which provides information about the parameters of temperature and mechanical changes in the state of an object, is built on a photonic-crystal fiber and a sensor on a fiber Bragg grating (FBG), respectively, in a change in signal intensity.…”

An In-Line Fiber Optic Fabry–Perot Sensor for High-Temperature Vibration Measurement

“…High-temperature vibration sensors are essential for the maintenance and fault detection of facilities and equipment in many fields, such as aerospace, oil and gas pipeline transportation, volcanic seismic activity detection, coal ore mining, and other fields, as well as the health monitoring of structures [1][2][3][4][5]. Fiber optic vibration sensors have been proven to have good application prospects in high-temperature measurement in past research, and they have the advantages of small size, high accuracy, and resistance to electromagnetic interference [6][7][8][9][10][11]. The fiber optic vibration sensors are mainly based on fiber Bragg gratings (FBGs), Mach-Zehnder interferometers, or Fabry-Perot (FP) interferometers.…”