大功率電法發(fā)送機(jī)中全波形記錄技術(shù)研究
發(fā)布時(shí)間：2018-10-16 22:42
【摘要】：MTEM發(fā)送機(jī)全波形電壓及電流記錄裝置是多通道瞬變電磁法勘探設(shè)備的重要組成部分之一,該記錄裝置負(fù)責(zé)持續(xù)采集并存儲(chǔ)MTEM發(fā)射機(jī)發(fā)出的偽隨機(jī)大電流信號(hào),通過與接收機(jī)采集的信號(hào)做卷積,從而獲得大地脈沖響應(yīng)。其采集信號(hào)幅度的準(zhǔn)確性與采集時(shí)刻的準(zhǔn)確性,都直接影響到最終的反演結(jié)果。本論文使用高精度Δ-Σ模數(shù)轉(zhuǎn)換器、現(xiàn)場可編程門陣列器件及高速USB微控制器等硬件,借助電子設(shè)計(jì)自動(dòng)化軟件平臺(tái),研發(fā)了適用于監(jiān)測(cè)大功率MTEM發(fā)射機(jī)的電壓及電流記錄裝置。MTEM發(fā)送機(jī)全波形電壓及電流記錄裝置主要由調(diào)理電路、采集電路、主控電路以及時(shí)鐘板組成。前端調(diào)理電路主要采用基于高速光耦的分壓與放大電路,采用低功耗儀用放大器INA128與低噪音、寬帶放大器OPA3690分別作為低速通道與高速通道的前端調(diào)理一級(jí),并在PCB板的布局與布線上多次優(yōu)化以保證整體噪音水平。采集電路采用Δ-Σ型模數(shù)轉(zhuǎn)換器ADS1271與流水線型模數(shù)轉(zhuǎn)換器AD9226分別作為低速與高速采集轉(zhuǎn)換的核心,以滿足持續(xù)低速采樣與間隔的高速采樣的設(shè)計(jì)要求。主控電路采用低成本、低功耗、高性價(jià)比的Cyclone III FPGA作為主芯片,外擴(kuò)大容量SDRAM作為緩沖,在高精度原子鐘的驅(qū)動(dòng)下,控制各個(gè)通道的采集與數(shù)據(jù)傳輸。論文根據(jù)MTEM發(fā)送機(jī)全波形電壓及電流記錄裝置的功能需求,在Quartus、Keil、CCS、VS2010軟件環(huán)境下完成軟件程序設(shè)計(jì)。主要設(shè)計(jì)實(shí)現(xiàn)了FPGA內(nèi)的采集控制與傳輸邏輯、高速USB微控制器的固件程序、MSP430馴服原子鐘模塊的程序與PC上位機(jī)顯示與存儲(chǔ)程序。通過對(duì)各子模塊進(jìn)行測(cè)試,全波形記錄裝置的低速電壓、高速電壓、低速電流與高速電流通道的采集精度達(dá)到了設(shè)計(jì)要求,整機(jī)長時(shí)間數(shù)據(jù)采集穩(wěn)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.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P631.325
本文編號(hào)：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.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P631.325
【共引文獻(xiàn)】
相關(guān)期刊論文 前1條
1 張法全;高平東;;TEM發(fā)射信號(hào)質(zhì)量測(cè)量算法研究[J];電測(cè)與儀表;2014年02期
，本文編號(hào)：2275852
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