Research And Design Of Signal Processing System Of Embedded Optical Fiber Acceleration Detector

All-optical fiber acceleration seismometer can offer sensitivity, anti-jamming and no-touched advantage which has an extensive application field, and its signal processing ability decide whole system's performance to some extent, because it will affect directly factors such as resolving power, precision dynamic range. In this paper, an embedded scheme was presented for implementing synthetic-heterodyne interferometric demodulation of acceleration seismometer system, disposing of noise and demodulating the satisfied phase signal, finally, acceleration signal was measured. This method will provide a new scheme for implementing signal detection and other measue instruments of optic interferometric principle.The signal processing system embedded kernel apparatus of ARM and DSP. The design scheme and realization method of embedded system are presented. ARM was used to communicate data and DSP implemented phase demodulation, and it expanded several interfaces. This system introduced the information communication mode of DSP and ARM and Linux OS transplant scheme. Furthermore, Synthetic-heterodyne interferometric demodulation principle and implementation flow in this embedded system were introduced.Implementing phase demodulation of the optical fiber acceleration seismometer by digital signal processing method will have the advantages of stability, sensitivity and anti-jamming, and have mutual function, network function and real time data processing ability. This system can reach the requirements of real time, accuracy and reliability.