基于扫频激光器和马赫-增德尔干涉结构的光纤传感系统,针对扫频激光器的频率步进不够精细导致干涉臂长差解调结果不精确的问题,提出了一种相似性解调方法.该方法通过在频率步进范围内进一步细分,构造相应细分值的模拟函数,与采集到的干...基于扫频激光器和马赫-增德尔干涉结构的光纤传感系统,针对扫频激光器的频率步进不够精细导致干涉臂长差解调结果不精确的问题,提出了一种相似性解调方法.该方法通过在频率步进范围内进一步细分,构造相应细分值的模拟函数,与采集到的干涉信号进行相似性对比,相似性最大时所对应的模拟干涉臂长差即为精确结果,并通过仿真与实验验证了该方法的可行性.实验表明该系统中干涉臂长差的解调范围为2~17 mm,该范围内解调结果最小分辨率为1μm,可以达到测试量程万分之一的分辨率,且抗干扰能力强、精度高,可实现信噪比大于6.87 d B时信号的解调.根据解调原理,在不强调实时性的应用中,可以通过提高细分的精细度,进一步提高系统分辨率.展开更多
Literature review on the status of consumption difference of rural residents and its causation analysis is carried out.Most researches introduce the status and causation of consumption cap in rural residents from diff...Literature review on the status of consumption difference of rural residents and its causation analysis is carried out.Most researches introduce the status and causation of consumption cap in rural residents from different aspects,which mainly analyze the obsolete data from the macroscopic angle by measuring methods.Only a few researches analyze the data in recent years from the provincial angle by using Theil index as the analysis index.Therefore,taking Anhui Province as an example,Theil index is selected to calculate the consumption gap of rural residents in Anhui Province in the years 2003-2008,according to the sample survey of rural households in Anhui Province in the years 2004-2009.Through the analysis of living consumption expenditure of rural residents,consumption change and its various internal causes are studied.Result shows that differentiation change of food and residence consumption expenditure is the major reason for the differentiation change of living consumption expenditure.Proportions of other expenditures are relatively small,having little impact on the living consumption of rural residents.Based on this,suggestions are put forward in order to minimize the difference in living consumption expenditure in rural areas,such as enhancing the income level of middle and low-income family in rural areas,improving the reform of education and health care,and strengthening the construction of rural road.展开更多
文摘基于扫频激光器和马赫-增德尔干涉结构的光纤传感系统,针对扫频激光器的频率步进不够精细导致干涉臂长差解调结果不精确的问题,提出了一种相似性解调方法.该方法通过在频率步进范围内进一步细分,构造相应细分值的模拟函数,与采集到的干涉信号进行相似性对比,相似性最大时所对应的模拟干涉臂长差即为精确结果,并通过仿真与实验验证了该方法的可行性.实验表明该系统中干涉臂长差的解调范围为2~17 mm,该范围内解调结果最小分辨率为1μm,可以达到测试量程万分之一的分辨率,且抗干扰能力强、精度高,可实现信噪比大于6.87 d B时信号的解调.根据解调原理,在不强调实时性的应用中,可以通过提高细分的精细度,进一步提高系统分辨率.
文摘Literature review on the status of consumption difference of rural residents and its causation analysis is carried out.Most researches introduce the status and causation of consumption cap in rural residents from different aspects,which mainly analyze the obsolete data from the macroscopic angle by measuring methods.Only a few researches analyze the data in recent years from the provincial angle by using Theil index as the analysis index.Therefore,taking Anhui Province as an example,Theil index is selected to calculate the consumption gap of rural residents in Anhui Province in the years 2003-2008,according to the sample survey of rural households in Anhui Province in the years 2004-2009.Through the analysis of living consumption expenditure of rural residents,consumption change and its various internal causes are studied.Result shows that differentiation change of food and residence consumption expenditure is the major reason for the differentiation change of living consumption expenditure.Proportions of other expenditures are relatively small,having little impact on the living consumption of rural residents.Based on this,suggestions are put forward in order to minimize the difference in living consumption expenditure in rural areas,such as enhancing the income level of middle and low-income family in rural areas,improving the reform of education and health care,and strengthening the construction of rural road.
