The amount of pre-stretch is a very important parameter of the sensor, affecting the sensitivity and natural frequency of the sensor. The optical fiber and the two fixed ends are bonded by epoxy resin, and a mass is placed in the middle of the optical fiber, and the mass worn on the optical fiber is adhered to the optical fiber by the resin glue. The mass is in the middle of the fiber and has a certain distance from the FBG. Because the quality of the fiber is small, the quality of the fiber is negligible, and different external forces within a certain range will cause different changes in the wavelength of the FBG without damaging the FBG. The performance, so we can approximate the fiber as an elastic rope. When the FBG is subjected to radial vibration, the external force causes the mass to vibrate and drive the fiber away from the horizontal position. The pulling of the fiber is equivalent to changing the period of the FBG, thereby causing the reflection wavelength of the FBG to drift. As the mass reciprocates, the wavelength of the FBG varies with the magnitude of the mass and the frequency of the mass. It can complete the calibration and verification of the vibration sensor to achieve measurement and analysis of high-speed vibration or noise signals. A sinusoidal signal is set on the computer and sent to the vibrating table by a signal generator and a power amplifier. The FBG sensor is fixed to the vibrating table by a self-made jig and vibrates therewith. An accelerometer is mounted on the vibrating table, and the accelerometer feeds back the measured acceleration value to the computer, and the computer adjusts the acceleration difference according to the setting and the measurement to stabilize the set acceleration. Golf Cap,Golf Flat Cap,Best Golf Hats,Golf Caps Online Henan J&F Headwear Group , https://www.jianfengcap.com