Optimization design for medium-high frequency FBG accelerometer with different eigenfrequency and sensitivity

A simple empirical equation of rotational stiffness for single-notch circular flexible gemel is proposed. Based oh the parameter optimization, we have discussed how to choose the structural parameter's to achieve the balance between the sensitivity and the eigenfrequency. By using sequential quadratic programming (SQP) method, two prototypes of FBG accelerometers with eigenfrequency of 650 Hz and 3050 Hz are designed. Furthermore, we also perform the shaking table test for the fabricated prototype sensors. The experimental results show that the measured eigenfrequency and sensitivity are approximately identical to design values. Also, the FBG accelerometers show great anti-interference capacity in flat range which may be applied to the structural-health monitoring. (C) 2015 Elsevier B.V. All rights reserved.