基于LabVIEW的阵列感应多频信号发射与接收特性研究

Transmitting and receiving characteristics of multi-frequency signal of the array induction based on the LabVIEW software

主要研究阵列感应测井仪多频信号的发射与接收机理。首先推导方波信号的傅里叶展开公式,证明方波与奇次谐波之间的分解和合成是可逆的。然后利用LabVIEW软件仿真无噪声时基于8个奇次谐波信号的阵列感应仪的多频信号发射与接收特性。结果表明,8个谐波合成发射近似方波,而接收不是方波,但具有提取方波信号的特征信息。最后研究含噪声时的发射和接收特性。通过仿真表明将堆栈技术和傅里叶变换结合起来可以有效消除接收信号中的各种随机噪声。研究成果对多频阵列感应测井仪器传感器的设计与实现具有重要的实际意义。

This paper mainly studies array induction logging tool multi-frequency signal transmitting and receiving mechanism.Firstly,the Fourier expansion formula of a square wave signal is derived.It shows that decomposition and synthesis between the square wave and the odd harmonics is reversible.Secondly,transmitting and receiving characteristics of the multi frequency signal of an array induction with 8 odd harmonic signals at the noise free case is simulated by the LabVIEW software.The results show that the transmitter wave synthesized by eight odd harmonic signals is close the square wave,and receiver wave is not a square wave,but it has the special mark which can identify the square wave signal.Finally,transmitting and receiving characteristics of multi frequency signal with a noise.The simulation shows that various random noises in the receiver wave can be eliminated effectively through combing the stack technology and Fourier transformation.Researched results play an important practical significance in the sensor design implement of the multi frequency array induction logging tool.