| 数字式平均法提高MRS探测信噪比应用研究 |
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| 引用本文： | 林君,张哲,王应吉,孙淑琴,尚新磊.数字式平均法提高MRS探测信噪比应用研究[J].仪器仪表学报,2012,33(3):508-513. |
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| 作者姓名： | 林君 张哲 王应吉 孙淑琴 尚新磊 |
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| 作者单位： | 地球信息探测仪器教育部重点实验室 吉林大学仪器科学与电气工程学院 长春 130061 |
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| 基金项目： | 科技部科技创新工作方法项目(3B810Z950537);吉林大学科学前沿与交叉学科创新项目(421033774537);吉林省科技计划(20090345)资助项目 |
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| 摘 要： | 针对核磁共振地下水探测仪信号甚微弱导致信噪比太低的问题,分析了野外施工环境电磁干扰的特点,设计了数字式平均型数据采集与数据预处理系统。把一次测量时间内的信号分成若干个时间间隔小段的信号,然后对这些信号进行取样,将各次测量中处于相同位置的取样进行积分平均。研究结果应用于JLMRS(Jilin magnetic resonance souding)型核磁共振地下水探测仪中,实验室与野外探测结果表明,数字式平均方法改善核磁共振地下水探测仪信号的信噪比是有效的、可行的。
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| 关 键 词： | 数字式平均 核磁共振法 信噪比 信噪改善比 |
Research on improving SNR of MRS detection with digital average method |
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| Lin Jun
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Zhang Zhe
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Wang Yingji
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Sun Shuqin
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Shang Xinlei.Research on improving SNR of MRS detection with digital average method[J].Chinese Journal of Scientific Instrument,2012,33(3):508-513. |
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| Authors: | Lin Jun Zhang Zhe Wang Yingji Sun Shuqin Shang Xinlei |
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| Affiliation: | (Lab.of Geo-Exploration and Instrumentation,Ministry of Education of China, College of Instrumentation and Electrical Engineering,Jilin University,Changchun 130061,China) |
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| Abstract: | Magnetic resonance sounding(MRS) signal is very weak and also sensitive to electromagnetic interference(noise),the signal to noise ratio(SNR) is low.According to the characteristic of electromagnetic noise in field environment,a digital average sampling and pre-processing system was designed.The periodic MRS signal is divided into several little interval segments and sampled,and integral average is performed on the samples at the same place of the little segments.The system was applied in the Jilin magnetic resonance souding(JLMRS) instrument for groundwater exploration.The results of laboratory test and field detection show that the digital average method is effective and feasible to improve the signal to noise ratio of MRS signal. |
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| Keywords: | digital average magnetic resonance sounding(MRS) signal to noise ratio(SNR) signal to noise improving ratio(SNIR) |
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