大功率电法发送机中全波形记录技术研究
发布时间：2018-10-16 22:42
【摘要】：MTEM发送机全波形电压及电流记录装置是多通道瞬变电磁法勘探设备的重要组成部分之一,该记录装置负责持续采集并存储MTEM发射机发出的伪随机大电流信号,通过与接收机采集的信号做卷积,从而获得大地脉冲响应。其采集信号幅度的准确性与采集时刻的准确性,都直接影响到最终的反演结果。本论文使用高精度Δ-Σ模数转换器、现场可编程门阵列器件及高速USB微控制器等硬件,借助电子设计自动化软件平台,研发了适用于监测大功率MTEM发射机的电压及电流记录装置。MTEM发送机全波形电压及电流记录装置主要由调理电路、采集电路、主控电路以及时钟板组成。前端调理电路主要采用基于高速光耦的分压与放大电路,采用低功耗仪用放大器INA128与低噪音、宽带放大器OPA3690分别作为低速通道与高速通道的前端调理一级,并在PCB板的布局与布线上多次优化以保证整体噪音水平。采集电路采用Δ-Σ型模数转换器ADS1271与流水线型模数转换器AD9226分别作为低速与高速采集转换的核心,以满足持续低速采样与间隔的高速采样的设计要求。主控电路采用低成本、低功耗、高性价比的Cyclone III FPGA作为主芯片,外扩大容量SDRAM作为缓冲,在高精度原子钟的驱动下,控制各个通道的采集与数据传输。论文根据MTEM发送机全波形电压及电流记录装置的功能需求,在Quartus、Keil、CCS、VS2010软件环境下完成软件程序设计。主要设计实现了FPGA内的采集控制与传输逻辑、高速USB微控制器的固件程序、MSP430驯服原子钟模块的程序与PC上位机显示与存储程序。通过对各子模块进行测试,全波形记录装置的低速电压、高速电压、低速电流与高速电流通道的采集精度达到了设计要求,整机长时间数据采集稳定、可靠。
[Abstract]:The full waveform voltage and current recording device of MTEM transmitter is one of the important components of multi-channel transient electromagnetic exploration equipment. The recording device is responsible for continuously collecting and storing pseudo-random high-current signals from MTEM transmitters. The earth pulse response is obtained by convolution with the signal collected by the receiver. The accuracy of the amplitude of the acquisition signal and the accuracy of the acquisition time directly affect the final inversion results. In this paper, high precision 螖-危 A / D converters, field programmable gate array devices and high speed USB microcontrollers are used, and the electronic design automation software platform is used. A voltage and current recording device suitable for monitoring high power MTEM transmitter is developed. The full waveform voltage and current recording device of MTEM transmitter is mainly composed of conditioning circuit, acquisition circuit, main control circuit and clock board. The front-end conditioning circuit mainly adopts the voltage-dividing and amplifying circuit based on high-speed optocoupler, the low-power amplifier INA128 and the low-noise amplifier, and the broadband amplifier OPA3690 as the front-end conditioning stage of the low-speed channel and high-speed channel, respectively. The layout and wiring of the PCB board are optimized several times to ensure the overall noise level. In the acquisition circuit, 螖-危 ADC ADS1271 and pipeline ADC AD9226 are used as the core of low speed and high speed acquisition respectively, so as to meet the design requirements of continuous low speed sampling and high speed sampling at intervals. The main control circuit uses Cyclone III FPGA with low cost, low power consumption and high performance-to-price ratio as the main chip, while the external expanded capacity SDRAM is used as buffer. Under the drive of high precision atomic clock, the acquisition and data transmission of each channel is controlled. According to the functional requirements of the full waveform voltage and current recording device of MTEM transmitter, the software program is designed under the Quartus,Keil,CCS,VS2010 software environment. The acquisition control and transmission logic in FPGA, the firmware program of high speed USB microcontroller, the program of MSP430 taming atomic clock module and the display and storage program of PC upper computer are designed and implemented. By testing the sub-modules, the acquisition accuracy of the low-speed voltage, high-speed voltage, low-speed current and high-speed current channel of the full waveform recording device has reached the design requirements, and the data acquisition of the whole machine for a long time is stable and reliable.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.325
本文编号：2275852
[Abstract]:The full waveform voltage and current recording device of MTEM transmitter is one of the important components of multi-channel transient electromagnetic exploration equipment. The recording device is responsible for continuously collecting and storing pseudo-random high-current signals from MTEM transmitters. The earth pulse response is obtained by convolution with the signal collected by the receiver. The accuracy of the amplitude of the acquisition signal and the accuracy of the acquisition time directly affect the final inversion results. In this paper, high precision 螖-危 A / D converters, field programmable gate array devices and high speed USB microcontrollers are used, and the electronic design automation software platform is used. A voltage and current recording device suitable for monitoring high power MTEM transmitter is developed. The full waveform voltage and current recording device of MTEM transmitter is mainly composed of conditioning circuit, acquisition circuit, main control circuit and clock board. The front-end conditioning circuit mainly adopts the voltage-dividing and amplifying circuit based on high-speed optocoupler, the low-power amplifier INA128 and the low-noise amplifier, and the broadband amplifier OPA3690 as the front-end conditioning stage of the low-speed channel and high-speed channel, respectively. The layout and wiring of the PCB board are optimized several times to ensure the overall noise level. In the acquisition circuit, 螖-危 ADC ADS1271 and pipeline ADC AD9226 are used as the core of low speed and high speed acquisition respectively, so as to meet the design requirements of continuous low speed sampling and high speed sampling at intervals. The main control circuit uses Cyclone III FPGA with low cost, low power consumption and high performance-to-price ratio as the main chip, while the external expanded capacity SDRAM is used as buffer. Under the drive of high precision atomic clock, the acquisition and data transmission of each channel is controlled. According to the functional requirements of the full waveform voltage and current recording device of MTEM transmitter, the software program is designed under the Quartus,Keil,CCS,VS2010 software environment. The acquisition control and transmission logic in FPGA, the firmware program of high speed USB microcontroller, the program of MSP430 taming atomic clock module and the display and storage program of PC upper computer are designed and implemented. By testing the sub-modules, the acquisition accuracy of the low-speed voltage, high-speed voltage, low-speed current and high-speed current channel of the full waveform recording device has reached the design requirements, and the data acquisition of the whole machine for a long time is stable and reliable.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.325
【共引文献】
相关期刊论文 前1条
1 张法全;高平东;;TEM发射信号质量测量算法研究[J];电测与仪表;2014年02期
，本文编号：2275852
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