大容量高速光纤光栅解调系统的数据压缩传输

提出了一种基于硬件差分压缩的数据传输方法,以实现大容量高速光纤Bragg光栅(FBG)解调系统中对大数据量的高效率传输。方法根据FBG峰值数据的特征进行差分处理减少数据量,并结合Lempel-Ziv-Welch(LZW)字典压缩算法消除数据冗余,最终实现大容量高速FBG解调数据的实时传输。数据处理与压缩算法在FPGA上进行硬件实现,数据吞吐率高。根据实验测试,在4kHz解调速率下,FBG静态信号数据压缩率达到16.56%,动态信号数据压缩率达到36.25%。测试结果表明,本文方法在航空发动机动态监测系统平台实验中压缩效果良好,能够有效解决在硬件资源受限下巨大数据量的传输问题。

Data compression and transmission for large-capacity and high-spe ed FBG interrogation systems

This paper designs and implements a ha rdware-based differential process and compress transmission method to solve the problem of mass data process with high transmission ratio for large-capacity an d high-speed fiber Bragg grating (FBG) interrogation systems.According to the feature of the demodulated data,this method makes differential process to decrease data amount initially,and combine s with the Lempel-Ziv-Welch dictionary compression method to reduce data redundancy.The method based on field programmable gate array (FPGA) has high data throughput.Demodulation frequency for test is 4kHz. Results show that the proposed method makes compression ratio down to 16.56% for static test of multiple FB G s and also attains 36.25% in dynamic test of multiple FBGs.Meanwhile,this method provides a satisfactory comp ress ratio in dynamic monitoring platform for aero-engine.Consequently,this method meets the demand o f high data transmission ratio with limited hardware.