Abstract
The intelligent structural health monitoring method, which uses a fiber Bragg
grating (FBG) sensor, is a new approach in the field of civil engineering. However,
it lacks a reliable FBG-based accelerometer for taking structural low frequency
vibration measurements. In this letter, a flextensional FBG-based accelerometer is
proposed and demonstrated. The experimental results indicate that the natural
frequency of the developed accelerometer is 16.7 Hz, with a high sensitivity of
410.7 pm/g. In addition, it has a broad and flat response over low frequencies
ranging from 1 to 10 Hz. The natural frequency and sensitivity of the accelerometer
can be tuned by adding mass to tailor the sensor performance to specific
applications. Experimental results are presented to demonstrate the good performance
of the proposed FBG-based accelerometer. These results show that the proposed
accelerometer is satisfactory for low frequency vibration measurements.
© 2011 Chinese Optics Letters
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