Abstract
This paper presents a fiber Bragg grating accelerometer prototype for seismic applications, including accelerometer scheme, calibration method and accelerometer resonance frequencies. The acceleration calibration and measurements were obtained from the laser beam deflection method. A series of experiments were carried out and results shows an accelerometer sensitivity of 8.07 mV/g (where 1g= 9.81 m/s2) at 0.5 Hz and 2.63 mV/g at 50 Hz, the measured range scale goes from 0 to 35 m s-2.
Highlights
Due to the great damage caused by the last seismic event in the highly populated Mexico City (September 19th, 2017), it is very important to have an accurate monitoring system in order to reduce casualties and building damages
There is a wide variety of accelerometers, such as: mechanical, micromechanical, piezoelectric, piezo-resistive, capacitive, heated gas, Hall effect, fiber Bragg grating (FBG) based, among others
The earthquake monitoring can be performed, among all the accelerometer kinds, by the fiber Bragg grating based accelerometers; FBG sensors have been developed during the last 30 years and have many applications. These kinds of sensors have the advantages over others: Electro Magnetic Interference (EMI) immunity, Radio Frequency Interference (RFI) immunity, low cost, compact size, multiplexing capacity, and a higher sensitivity [2,3]
Summary
Due to the great damage caused by the last seismic event in the highly populated Mexico City (September 19th, 2017), it is very important to have an accurate monitoring system in order to reduce casualties and building damages. The earthquake monitoring can be performed, among all the accelerometer kinds, by the fiber Bragg grating based accelerometers; FBG sensors have been developed during the last 30 years and have many applications These kinds of sensors have the advantages over others: Electro Magnetic Interference (EMI) immunity, Radio Frequency Interference (RFI) immunity, low cost, compact size, multiplexing capacity, and a higher sensitivity (mainly at frequencies under 1 Hz) [2,3]. In this work, it is discussed the manufactory and testing of an accelerometer based on a fiber Bragg grating. The results show that this FBG accelerometer provides a ratio of 8.07 mV/g at 0.5 Hz and 2.63 mV/g at 50 Hz without signal amplification, and an effective frequency bandwidth from 0.01 to 50 Hz (earthquakes common frequencies range)
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