【作者】 赵星；

【导师】 陈福深；

【作者基本信息】 电子科技大学 ， 光学工程， 2015， 硕士

【摘要】 近年来,集成光波导电光调制器发展非常迅速,由此同时,提升了与之相关的集成光波导电场传感器的应用范围与实用程度。但是,由于使用的电磁测量硬件一般都是金属器件,会对测量有干扰,存在一定的噪声,最终造成的结果便是数据不准确。如果需要对数据进行进一步的探究,则需要对采集到的信号进行降噪处理。本文就以去噪为重点,分别设计了两套方案。对信号进行降噪有很多种方法,当然每种方法适用的范围不同,需要根据信号的自身特征来选择相对应的信号处理方法进行降噪处理,针对传感系统探测到的高压脉冲信号,本文中选择的是小波变换去噪与滑动平均值去噪。为了处理高压脉冲信号,选定小波变换,可以实现低频处频率细分,高频处时间细分,以及平均值的平滑作用。经过建立仿真,计算数据,进行实验,得到了较好的降噪效果。本文的主要内容为:(1)在MATLAB与VC6.0环境下,进行了小波变换与滑动平均值算法仿真,采用不同的参数得到不同的结果,观察并计算了各自提升的信噪比。(2)在LabVIEW软件环境下,采用不同的参数进行了小波变换与滑动平均值算法仿真,并对得到的结果进行计算。(3)设计DSP采集与处理系统,对光学传感系统输出的电压信号进行采集,采集之后利用之前的仿真算法进行处理并输出,进行实验分析。(4)设计LabVIEW系统,对光学传感系统输出到示波器中的数据进行采集,并且使用之前的仿真算法进行处理,输出观察,并且进行分析。更多还原

【Abstract】 In recent years, integrated optical waveguide electro-optic modulator is developing very quickly, which promoted the related integrated optical waveguide electric field sensor’s range of application and practical level at the same time. However, electromagnetic measurement is usually metal hardware devices, which will lead to measurement interference and noise, finilly, the result is inaccurate. If the data need further inquiry, signal noise reduction processing is need. In this paper, two sets of scheme is designed for denoising.There are many kinds of methods for signal de-noising, different method applicable scope is different. It need to choose corresponding signal processing method for noise reduction processing according to the own characteristics of the signal. In this paper wavelet transform denoising and sliding average denoising is selected in view of the high voltage pulse signal sensing system. Wavelet transform can realize frequency resolution at low frequency and temporal resolution at high frequency. Average algorithm can achieve a smooth function. After building simulation, data calculation, experiment obtained good noise reduction effect.The main content of this article,(1) The wavelet transform and moving average algorithm simulation is carried on, using different parameters, has different results in the matlab and VC6.0. Then calculate the ascension of signal-to-noise.(2) Under the environment of LabVIEW software, the wavelet transform and moving average algorithm simulation, using different parameters, get different results.(3) Design DSP of acquisition and processing system for optical sensing system output voltage signal, using previous simulation algorithm for processing and output after acquisition, then experimental analysis.(4) Design LabVIEW system to collect data in the system of optical sensor output to the oscilloscope, using the simulation algorithm for processing, and carries on the analysis.更多还原