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当前位置: 首页 > 文章 > 牛肉激光动态散斑活性影响因素研究 农业机械学报 2016 (2) 288-294+301
Position: Home > Articles > Factors Affecting Dynamic Laser Speckle Activity of Beef Transactions of the Chinese Society for Agricultural Machinery 2016 (2) 288-294+301

牛肉激光动态散斑活性影响因素研究

作  者：
董庆利;金曼;胡孟晗;刘宝林
单  位：
上海理工大学医疗器械与食品学院
关键词：
牛肉;激光散斑;散斑活性;快速检测;条件优化
摘  要：
以时间序列散斑图的惯性力矩作为散斑活性,研究新鲜牛肉图像散斑活性的相关影响因素,以优化激光散斑的测定效果。采用He-Ne激光器照射牛肉表面,通过工业相机获取图像,测得时间序列散斑图的散斑活性值,检测成像时图像的精度差异,研究不同条件下牛肉散斑活性的变化趋势。应用Box-Behnken试验设计,建立光照强度、激光波长和入射角度3个因素的二次多项式回归模型并进行分析。结果表明光照强度、激光波长和入射角度对牛肉散斑活性影响显著,得到牛肉图像散斑活性值最大时的优化测定条件为激光波长635 nm、光照强度30 m W、入射角度15°,在此条件下,散斑图像的散斑活性达到476.04,散斑活性预测模型的决定系数R2为0.992,均方根误差RMSE为8.14,偏差因子(Bf)和准确因子(Af)均在可接受范围内。明确不同因素对新鲜牛肉激光动态散斑图像的影响,可提高激光动态散斑活性的识别精度,为改进牛肉品质的测定方法提供了理论依据。
译  名：
Factors Affecting Dynamic Laser Speckle Activity of Beef
作  者：
Dong Qingli;Jin Man;Hu Menghan;Liu Baolin;School of Medical Instrument and Food Engineering,University of Shanghai for Science and Technology;
关键词：
beef;;laser speckle;;speckle activity;;rapid detection;;condition optimization
摘  要：
Dynamic laser speckle technique,also termed as dynamic biospeckle,is a portable and noninvasive as well as low-cost screening tool for online or point-of-sale applications on agricultural products.A custom made dynamic laser speckle system mainly consisted of a He-Ne laser generator operating at the four wavelengths of 405 nm,520 nm,635 nm and 780 nm,respectively,an industrial CMOS camera for the sequential images acquisition,a computer and a height adjustable sample stage. The lighting and imaging units were placed into an illumination chamber to avoid the interference of natural light. In order to optimize the measurement conditions of dynamic laser speckle technique for the beef quality evaluation,a temporal history of speckle patterns viz. inertia moment was used as speckle activity to assess the effects of the laser incident angle,laser wavelength,and lighting intensity on beef dynamic biospeckle quality.The single factor experimental design was first applied for determining preliminary suitable lighting conditions for the later Box-Behnken experimental design. Subsequently,a response surface regression function of three lighting factors was obtained to optimize the measurement conditions for beef dynamic biospeckle. Above results demonstrated that the speckle activity could reach 476. 04,the R2 value was0. 992,root mean square error value was 8. 14,bias factor( Bf) and accuracy factor( Af) values were within the acceptable range of 1. 0 < Bf< Af< 1. 05 via the optimal processing. Therefore,for the further beef biospeckle measurement,the lighting conditions are as follows: lighting intensity is 30 m W,laser wavelength is 635 nm and laser incident angle is 15°. In a conclusion,the analysis of different lighting factors for the biospeckle acquisition might improve the qualitative or quantificational identificationaccuracy of beef dynamic biospeckle,and also provide the theoretical reference for the biospeckle measurement of the other foods.

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