Flexural beam-based fiber Bragg grating accelerometers

Abstract

A flexural beam is utilized as the primary transduction mechanism for demonstrating a series of fiber Bragg grating (FBG) accelerometers. The fully packaged FBG accelerometers reported in this work have many desirable features including good acceleration sensitivity (212.5 μ/spl epsiv//g), high resonant frequencies (on the order of 1 kHz), very low cross-axis sensitivity (<1% of the primary axial responsivity), and low noise (/spl sim/1 mg//spl radic/(Hz) near 1 Hz). Arrays of such devices can be utilized in a variety of applications, including structural monitoring. Closed-form analytical formulas describing the resonant frequency and responsivity of the FBG accelerometer are provided which may be utilized to tailor the sensor performance to specific applications.