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讨论光源照射角度对近红外光谱检测苹果糖度模型的影响,得出最佳的光源照射方式。以苹果为研究对象,糖度为检测指标,2盏100 W卤素灯作为光源,从3种不同光源照射角度(30°、45°、60°)照射放置于中间的苹果样品,得到漫透射光谱数据并建立偏最小二乘回归(PLS)模型。当光照角度为45°时,模型的精度最高,其校正集相关系数Rc=0.91,校正集均方根误差xRMSEC=0.57,验证集相关系数Rp=0.84,验证集均方根误差xRMSEP=0.73。不同的光照角度对模型精度有一定的影响,为建立实际模型时选择最佳的光照角度提供了可靠的依据。
Discuss the impact of light irradiation angle on the detection of apple brix model by near infrared spectroscopy, the best light source irradiation. Taking apple as the research object and the sugar content as the detection index, two 100 W halogen lamps were used as the light source to irradiate the apple samples placed in the middle from the irradiation angles of three different light sources (30 °, 45 ° and 60 °) to obtain diffuse transmittance data And build partial least squares regression (PLS) model. When the illumination angle is 45 °, the accuracy of the model is the highest, the correlation coefficient of calibration set Rc = 0.91, the root mean square error of calibration set xRMSEC = 0.57, the correlation coefficient of validation set Rp = 0.84 and the validation set root mean square error xRMSEP = 0.73. Different illumination angles have a certain impact on the accuracy of the model, which provides a reliable basis for selecting the best illumination angle when establishing the actual model.