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多通道混合數據采集系統設計與實(shí)現
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西安工業(yè)大學(xué)

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Design and Implementation of Multi-channel Hybrid Data Acquisition System
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    摘要:

    靜爆試驗中需要對各測控點(diǎn)上多個(gè)前級差分式梳狀激光光幕探測器輸出的多路模擬數據進(jìn)行采集,針對前級設備通道數多,時(shí)間精度高且數據量大后期難處理的問(wèn)題;設計了一種具有自治能力的混合數據采集系統,該系統能自動(dòng)剔除無(wú)效數據,將破片過(guò)幕時(shí)所產(chǎn)生的彈形信號及該彈形信號對應的UTC時(shí)刻值組成的混合信號緩沖并傳輸至上位機。該系統采用FPGA+ARM的架構完成采集緩沖任務(wù),根據上位機配置和閾值自動(dòng)剔除無(wú)效數據,結合GPS馴服溫補晶振的手段使本地時(shí)鐘與UTC時(shí)鐘保持us級同步,并對采集彈形模擬數據進(jìn)行UTC時(shí)鐘打標形成混合數據包,通過(guò)USB2.0總線(xiàn)高速模式傳至上位機。經(jīng)實(shí)際測試該設計滿(mǎn)足靜爆試驗中對前級探測器輸出信號的采集需求,數據量大大減少,UTC時(shí)標精度滿(mǎn)足后續處理要求并且成本低廉,穩定性高。

    Abstract:

    The static explosion test needs to collect multiple analog data output from multiple front-stage differential comb-shaped laser light curtain detectors at each measurement and control point. For the front-stage equipment, there are many channels, high time accuracy, and large data volume. A hybrid data acquisition system with autonomous capability was designed. This system can automatically remove invalid data and buffer the mixed signal composed of the bullet-shaped signal generated when the fragment passes through the curtain and the UTC time value corresponding to the bullet-shaped signal. And transmitted to the host computer. The system uses the FPGA + ARM architecture to complete the acquisition buffer task, automatically remove invalid data according to the configuration of the host computer and the threshold value, combined with GPS to tame the temperature-compensated crystal oscillator to synchronize the local clock with the UTC clock, and perform UTC on the collected bullet-shaped analog data The clock is marked to form a mixed data packet, which is transmitted to the upper computer through the USB2.0 bus high-speed mode. After actual testing, the design meets the requirements for the output signal of the front-stage detector in the static explosion test, the data volume is greatly reduced, the UTC time stamp accuracy meets the subsequent processing requirements, and the cost is low and the stability is high.

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嚴博.多通道混合數據采集系統設計與實(shí)現計算機測量與控制[J].,2020,28(2):224-228.

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  • 收稿日期:2019-11-29
  • 最后修改日期:2019-12-18
  • 錄用日期:2019-12-18
  • 在線(xiàn)發(fā)布日期: 2020-02-24
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