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首页> 外文期刊>Journal of geophysics and engineering >Design of acoustic logging signal source of imitation based on field programmable gate array
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Design of acoustic logging signal source of imitation based on field programmable gate array

机译：基于现场可编程门阵列的仿生声波测井信号源设计

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摘要

An acoustic logging signal source of imitation is designed and realized, based on the Field Programmable Gate Array (FPGA), to improve the efficiency of examining and repairing acoustic logging tools during research and field application, and to inspect and verify acoustic receiving circuits and corresponding algorithms. The design of this signal source contains hardware design and software design,and the hardware design uses an FPGA as the control core. Four signals are made first by reading the Random Access Memory (RAM) data which are inside the FPGA, then dealing with the data by digital to analog conversion, amplification, smoothing and so on. Software design uses VHDL, a kind of hardware description language, to program the FPGA. Experiments illustrate that the ratio of signal to noise for the signal source is high, the waveforms are stable, and also its functions of amplitude adjustment, frequency adjustment and delay adjustment are in accord with the characteristics of real acoustic logging waveforms. These adjustments can be used to imitate influences on sonic logging received waveforms caused by many kinds of factors such as spacing and span of acoustic tools, sonic speeds of different layers and fluids, and acoustic attenuations of different cementation planes.
机译：基于现场可编程门阵列（FPGA），设计并实现了模仿声记录信号源，以提高研究和现场应用过程中对声记录工具的检查和维修效率，并检查和验证声接收电路及相应的算法。该信号源的设计包括硬件设计和软件设计，硬件设计以FPGA为控制核心。首先通过读取FPGA内部的随机存取存储器（RAM）数据来产生四个信号，然后通过数模转换，放大，平滑等处理数据。软件设计使用一种硬件描述语言VHDL对FPGA进行编程。实验表明，该信号源的信噪比高，波形稳定，其幅度调整，频率调整和延迟调整的功能与真实声波记录波形的特点相吻合。这些调整可用于模拟由多种因素引起的对声波测井接收波形的影响，例如声学工具的间距和跨度，不同层和流体的声速，以及不同胶结平面的声衰减。

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