A compact fiber optic accelerator

Abstract

A compact fiber optic Michelson interferometer based accelerometer is proposed and demonstrated. In this sensing system, two optical fibers have been used as the differential sensing element. By way of demodulating the different optical phase, we can obtain the acceleration which proportional to the initial force applied on the central position of the two fibers. A simple model has been built to calculate the sensitivity and resonant frequency. The experimental results show that such an accelerometer has a sensitivity of 0.42rad/g at the resonant frequency 600Hz.

Research Progress of Fiber Grating Vibration Sensor

“…When the external vibration occurs, the relative movement between the substrate and the mass will produce a stress change with the external vibration on the detection arm, thus changing the interference intensity of the MSI, forming a fiber-based vibration sensor based on MSI, The frequency range is 5Hz ~ 500Hz. In 2003, Liu Yang team used 6 hollow cascading pillars to support a mass, forming a three-dimensional harmonic vibration sensor, the acceleration sensitivity of 15.7×10 3 rad/g [16]. In 2005, Tianjin University achieved a Michelson interferometric accelerometer based on a simple harmonic oscillator.…”

“…Commonly used fiber interferometers generally include Michelson interferometer (MSI), Mach-Zehnder interferometer (MZI) and Fabry-Perot interferometer (FPI). Therefore, this paper will review the optical phase modulation type vibration sensor from the fiber MSI vibration sensor [13][14][15][16][17], the optical fiber MZI vibration sensor [18][19] and the optical fiber FPI vibration sensor [20][21][22][23][24][25].…”

“…In recent years, fiber optic sensor technology based on fiber optic sensor with its anti-electromagnetic interference, small size, light weight, wide dynamic range, high precision, can work in harsh environments have been the rapid development of the advantages [2]. In the past few decades, fiber optic vibration sensor has been a lot of research and reports, according to the parameters of light modulation can be divided into four categories: light intensity modulation [3][4][5][6][7][8][9][10][11][12], optical phase modulation [13][14][15][16][17][18][19][20][21][22][23][24][25] And optical wavelength modulation [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] vibration sensor, this paper mainly discusses the status of these three sensors.…”