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首页> 外文会议>Sensing for Agriculture and Food Quality and Safety VII >Depth of Penetration of a 785nm Wavelength Laser in Food Powders
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Depth of Penetration of a 785nm Wavelength Laser in Food Powders

机译：食品粉末中785nm波长激光的穿透深度

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摘要

Raman spectroscopy is a useful, rapid, and non-destructive method for both qualitative and quantitative evaluation of chemical composition. However it is important to measure the depth of penetration of the laser light to ensure that chemical particles at the very bottom of a sample volume is detected by Raman system. The aim of this study was to investigate the penetration depth of a 785nm laser (maximum power output 400mw) into three different food powders, namely dry milk powder, corn starch, and wheat flour. The food powders were layered in 5 depths between 1 and 5 mm overtop a Petri dish packed with melamine. Melamine was used as the subsurface reference material for measurement because melamine exhibits known and identifiable Raman spectral peaks. Analysis of the sample spectra for characteristics of melamine and characteristics of milk, starch and flour allowed determination of the effective penetration depth of the laser light in the samples. Three laser intensities (100, 200 and 300mw) were used to study the effect of laser intensity to depth of penetration. It was observed that 785nm laser source was able to easily penetrate through every point in all three food samples types at 1mm depth. However, the number of points that the laser could penetrate decreased with increasing depth of the food powder. ANOVA test was carried out to study the significant effect of laser intensity to depth of penetration. It was observed that laser intensity significantly influences the depth of penetration. The outcome of this study will be used in our next phase of study to detect different chemical contaminants in food powders and develop quantitative analysis models for detection of chemical contaminants.
机译：拉曼光谱法是一种对化学成分进行定性和定量评估的有用，快速且无损的方法。但是，重要的是测量激光的穿透深度，以确保拉曼系统能检测到样品体积最底部的化学颗粒。这项研究的目的是研究785nm激光（最大功率输出400mw）对三种食品粉（干奶粉，玉米淀粉和小麦粉）的穿透深度。将食品粉末在装有三聚氰胺的陪替氏培养皿上以1-5毫米之间的5个深度分层。三聚氰胺被用作测量的地下参考材料，因为三聚氰胺表现出已知且可识别的拉曼光谱峰。通过分析样品光谱中三聚氰胺的特性以及牛奶，淀粉和面粉的特性，可以确定样品中激光的有效穿透深度。使用三种激光强度（100、200和300mw）来研究激光强度对穿透深度的影响。据观察，785nm的激光源能够轻松穿透1mm深度的所有三种食物样品中的每个点。但是，随着食物粉末深度的增加，激光可以穿透的点数减少。进行方差分析测试以研究激光强度对穿透深度的显着影响。观察到激光强度显着影响穿透深度。这项研究的结果将在我们的下一阶段研究中使用，以检测食品粉中的不同化学污染物，并开发定量分析模型以检测化学污染物。

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  • 会议地点 Baltimore MD(US)
  • 作者

    Kuanglin Chao; Sagar Dhakal; Jianwei Qin; Moon S. Kim; Yankun Peng; Walter F. Schmidt;

  • 作者单位

    USDA/ARS/EMFSL, Bldg. 303, BARC-East, 10300 Baltimore Ave., Beltsville, MD 20705-2350, USA;

    Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, United States Department of Agriculture, 10300 Baltimore Avenue, Bldg 303 BARC- East, Beltsville, MD, USA 20705;

    Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, United States Department of Agriculture, 10300 Baltimore Avenue, Bldg 303 BARC- East, Beltsville, MD, USA 20705;

    Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, United States Department of Agriculture, 10300 Baltimore Avenue, Bldg 303 BARC- East, Beltsville, MD, USA 20705;

    China Agricultural University, 17 Qinghua East Road, Haidian, Beijing 100083, China;

    Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, United States Department of Agriculture, 10300 Baltimore Avenue, Bldg 303 BARC- East, Beltsville, MD, USA 20705;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Raman spectroscopy; chemical contaminants; depth of laser penetration; quantitative analysis;

    机译：拉曼光谱化学污染物；激光穿透深度；定量分析;

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