A Low Frequency FBG Accelerometer with Symmetrical Bended Spring Plates
نویسندگان
چکیده
To meet the requirements for low-frequency vibration monitoring, a new type of FBG (fiber Bragg grating) accelerometer with a bended spring plate is proposed. Two symmetrical bended spring plates are used as elastic elements, which drive the FBG to produce axial strains equal in magnitude but opposite in direction when exciting vibrations exist, leading to doubling the wavelength shift of the FBG. The mechanics model and a numerical method are presented in this paper, with which the influence of the structural parameters on the sensitivity and the eigenfrequency are discussed. The test results show that the sensitivity of the accelerometer is more than 1000 pm/g when the frequency is within the 0.7-20 Hz range.
منابع مشابه
Experimental verification of the modified spring-mass theory of fiber Bragg grating accelerometers using transverse forces.
A fiber Bragg grating (FBG) accelerometer using transverse forces is more sensitive than one using axial forces with the same mass of the inertial object, because a barely stretched FBG fixed at its two ends is much more sensitive to transverse forces than axial ones. The spring-mass theory, with the assumption that the axial force changes little during the vibration, cannot accurately predict ...
متن کاملپایش لرزشهای بسامد بزرگ در اتاقهای آزمون موتور به کمک لرزهگیرهای بادی نیمه فعّال با پایشگر PID
Today there are different vibration isolators used in industries according to the weight and excitation frequency of the machines which have vibration. One of them is Air Spring which is in two types: Convoluted air spring and membrane air spring. Convoluted air springs are used to control vibrations in low frequency (usually lower than 10 Hz) and the membrane ones are used in high frequenc...
متن کاملCharacterisation of a Highly Symmetrical Miniature Capacitive Triaxial Accelerometer
polyimide (PI) as flexible interconnection layer between the W mass W house and movatile capacitor plate capacitor plates. The sensor structure and its basic operating A A principle, its mathematical mass-spring-damper model and the necessary cleanroom technology are described. The measurement results show a sensitivity of 0.15 V/(m/s2) with a corresponding resolution of 0.01 m/s2, an off-axis ...
متن کاملDesign, fabrication, and testing of a meso-scale accelerometer made of spring steel
This paper reports a novel, low-cost, moderately sensitive, meso-scale accelerometer fabricated with spring steel foil and equipped with either a Hall Effect-based proximity sensor or a capacitive sensor. Since the sensitivity of a Hall Effect sensor is low, we attach a displacement-amplifying compliant mechanism (DaCM) to the proof-mass of the accelerometer to increase the overall sensitivity ...
متن کاملPrecision Accelerometers for Gravity Gradient Measurements
An accelerometer, based on a microwave sapphire resonator, is under development for application in a compact gravity gradiometer. This gravity gradiometer potentially can be used in space gradiometry, precision navigation, and geodesy. The principle of operation of the accelerometer is based on measurements of classical springproof-mass displacements, which are converted to phase shifts in the ...
متن کامل