基于DSP芯片控制的光纤光栅传感解调系统

Demodulation system for diber grating sensors based on DSP control

提出并实现了基于DSP芯片控制的准分布式光纤Bragg光栅传感网络信息解调系统,着重介绍了基于可调谐光纤F-P滤波(TFFP)解调技术的工作原理,并给出了此解调系统硬件设计的详细接口图。该系统扫描频率在25～100Hz间可调,分辨率达2pm,动态测量范围达50nm。同时变频变幅的TFFP锯齿波扫描信号可以灵活地改变系统的扫描范围,进一步提高了系统的解调速度。

How to detect the wavelength change of the fiber grating sensors in sensing measurement is a difficulty. It is also restricted the application and development of this sensor. A demodulation system of distributed fiber Bragg grating sensor network which is based on DSP controlling is proposed and demonstrated. The prin- ciple of a demodulation technique with an optical fiber Fabry-Perot tunable filter （TFFP） is introduced. And the detailed figure of the hardware design for the system is presented. The scanning frequency of this system is 25Hz-100Hz;The resolution is 2pm;the range of dynamic measure is 50nm,While the alterable frequency and scope sawtooth sweep signal for TFFP can neatly change the scanning range of the system, which is more improved the demodulation spced.