Research on quorum sensing signal molecules of pseudomonas spp . isolated from food 食源假单胞菌群体感应信号分子的研究
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When it is affected by different temperature , a sensing signal will be obtained through inside measuring loop 以热电阻偶为感温元件，当它感受到温度变化时，通
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The former includes air - bearing table system , rolling base driving system , angular displacement sensing system , and two foldable flexible plates with piezoelectric patches bonded ; the latter includes sensing signal processing and actuation signal generating circuits , and computer system composed of pc and two tms320f240 整个控制系统的处理器是一个由两块tms320f240和586微机组成的主从复合系统，通过对计算负荷的合理分配，有力地保证了控制的实时性。
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The algorithm principle , hardware design and software design of the scheme are proposed and experimentally demonstrated ; the main contents of this thesis are as follows : firstly , we study the principle of the fiber optic weak magnetic sensor based on magnetostrictive effect . after analyzing the characters of the magnetic field sensing signals , we know that the magnetic field sensing signals ’ fundamental component is proportional to input dc magnetic field 叙述了该方案的原理、软硬件设计过程,并通过实验进行了验证,本文主要内容如下:首先,研究了基于磁致伸缩效应的光纤微弱磁场传感器传感原理以及输出信号的特征,分析得出在干涉仪处于正交工作点时,传感器输出信号的基频分量与被测直流磁场成正比关系。
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In the thesis , a signal processing scheme of polarization - insensitive fiber optic michelson interferometric magnetic sensor is described : making the interferometer work near the quadrature with closed loop controlling working point method , the fundamental frequency component of the magnetic field sensing signals can be detected to measure the input direct current ( dc ) magnetic field by phase sensitive demodulation 本文主要介绍了偏振无关光纤michelson干涉型微弱磁场传感器信号处理的方案:通过闭环控制工作点算法使干涉仪工作在正交工作点处,再利用相敏检波算法提取传感器输出信号的基频分量,以测量直流磁场的大小。
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Chapter 4 designs and determines the parameters of the algorithm adopted in the instrument system . analyzes and compares the different effects to frequency estimation when using digital filters with different group delay ; determines the data length , a parameter of frequency estimation ; introduces the method of available judgment of sensing signal and determines the judgment threshold as well 第四章设计和确定了仪器系统软件算法的部分参数：分析和比较了不同群延迟特性的数字滤波器对频率估计的影响；确定了影响频率估计参数?数据长度的取值规律；给出了判断传感信号有效性的检测方法并确定了检测门限的取值规律。
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The major researches in this thesis include : applying the digital signal processing technology and theory of signal detection & estimation to estimate carrier frequency of the sensing signal that reflects the measurand ; implementing the algorithm in labview , a virtual instrument development platform 本文的主要研究内容是：运用数字信号处理技术和信号检测、估计的基本原理从无源、无线saw谐振器型传感器的传感输出信号中提取出反映被测量的信号主频，并在虚拟仪器软件开发平台labview上实现了测量算法。
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