基于小波滤波的低场NMR纤维上油率检测新方法

波谱学杂志 ›› 2012, Vol. 29 ›› Issue (1): 32-41.

• 低场磁共振技术与应用专栏 • 上一篇下一篇

基于小波滤波的低场NMR纤维上油率检测新方法

李新军¹，张英力²，杨培强²，聂生东^1*

1. 上海理工大学医学影像工程研究所，上海 200093；
2. 上海纽迈电子科技有限公司，上海 200333

收稿日期:2011-04-18 修回日期:2011-05-18 出版日期:2012-03-05 发布日期:2012-03-05
基金资助:
国家自然科学基金资助项目（60972122），上海市重点学科建设项目(P0502).

A Wavelet Filtering Method for Measuring Oil Content of Fiber with Low-Field NMR

LI Xin-Jun¹, ZHANG Ying-Li², YANG Pei-Qiang², NIE Sheng-Dong^1*

1. Institute of Medical Imaging Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
2. Shanghai Niumag Corporation, Shanghai 200333, China

Received:2011-04-18 Revised:2011-05-18 Online:2012-03-05 Published:2012-03-05
Supported by:
国家自然科学基金资助项目（60972122），上海市重点学科建设项目(P0502).

摘要/Abstract

摘要：

针对目前低场核磁共振纤维上油率检测存在的问题，提出了一种基于小波变换的纤维上油率检测新方法. 首先，用低场核磁共振采集标准纤维自由感应衰减信号进行线性拟合得到定标曲线；然后，用测试纤维采集多组叠加次数不同的核磁共振信号，并分别进行小波软阈值滤波；最后，将滤波后的多组结果代入定标曲线计算纤维的上油率. 检测结果和实际应用表明小波软阈值滤波可有效去除纤维FID信号中的噪声并大幅缩短检测时间. 此方法可为低场核磁共振纤维上油率快速、准确检测奠定基础.

关键词: 核磁共振(NMR), 小波滤波, 软阈值, 纤维上油率, 检测

Abstract:

A new wavelet transform-based method for measuring the oil content of fiber with low-field NMR was introduced. Firstly, free induction decays (FID) of the standard fibers were collected and used to calculate the calibration curve through linear fitting. Secondly, the signals of the testing fiber were collected with different numbers of averages, and wavelet soft threshold was used to filter each of the collected signals. Finally, the oil content of the fiber was calculated by comparing the filtered NMR signals with the calibration curve. Practical applications were used to validate the effectiveness of the new method.

Key words: NMR, wavelet filtering, soft threshold, oil content of fiber, detection

中图分类号:

O482.53

李新军, 张英力, 杨培强, 聂生东. 基于小波滤波的低场NMR纤维上油率检测新方法[J]. 波谱学杂志, 2012, 29(1): 32-41.

LI Xin-Jun, ZHANG Ying-Li, YANG Pei-Qiang, NIE Sheng-Dong. A Wavelet Filtering Method for Measuring Oil Content of Fiber with Low-Field NMR[J]. Chinese Journal of Magnetic Resonance, 2012, 29(1): 32-41.

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基于小波滤波的低场NMR纤维上油率检测新方法

A Wavelet Filtering Method for Measuring Oil Content of Fiber with Low-Field NMR

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