摘要
分布式光纤测温系统具有本质安全、抗电磁干扰能力强、快速多点测量和定位、易于安装等特点。提出了以DSP为核心的分布式测温系统,并针对拉曼散射温度信号完全淹没在噪声之中的特点,采用一种改进的小波阈值函数和阈值选取方法来对拉曼散射温度信号进行去噪。仿真实验表明,改进阈值函数的小波去噪有效地提高了去噪效果,从而提高了分布式光纤测温系统的精度并简化了系统结构。
Distributed fiber optic temperature measurement system has the characteristics of intrinsic safety, strong anti-electromagnetic interference capability, fast multi-points measurement and positioning, easy to install and so on. This paper introduces a distributed temperature measurement system based on DSP. Because the Raman scattering signal including temperature information is completely submerged in noise. We pick up an improved threshold function and threshold selection method to denoise the Raman scattering signal. Simulation results show that the improved wavelet denoising threshold function can effectively improve the noise reduction effect, improve the accuracy of the distributed fiber optic temperature measurement system, and simplify the system structure.
出处
《计算机系统应用》
2011年第9期135-138,共4页
Computer Systems & Applications
关键词
分布式测温
DSP
拉曼散射
小波去噪
能量熵
distributed temperature measurement
DSP
raman scattering
wavelet deniosing
energy entropy
