包覆材料对红外热成像测量生鲜食品温度效果的影响

Research on temperature measurement of fresh food by IR imaging technology

探索了红外热成像技术在食品冷链中生鲜农产品温度检测中的应用。选择两种类型新鲜农产品甜菜和黄瓜,置于托盘中,并分别覆盖3种材料(Tyvek,金属化PET,金属化发泡PET),将食品托盘置于模拟配送过程中的冷藏室中,分别用红外热成像照相机和探针式测温仪对其表面温度进行检测和比较。结果表明,红外热成像照相机和探针式测温仪所测得的温度相差1.9~6.0℃。应用红外热成像照相机测温时,金属化PET的高发射率会导致食品托盘明显的温度读取误差。而Tyvek的发射率与红外热成像照相机接近,红外热成像照相机获取的温度值误差较小。

In this study,the application of infrared thermal imaging technology in the detection of fresh agricultural products in cold chain of food was explored.Two fresh agricultural sugar beets and cucumbers were selected and placed on a tray,each covered with three materials(Tyvek,Metallized PET,Metallized Foam PET)to produce a different coated food tray.The food tray was placed in the cold room during the simulation distribution.The surface temperature of the food tray was detected and compared with the infrared thermal imaging camera and the needle detector.The results showed that the temperature measured by the infrared thermal imaging camera and the detecting thermometer was 1.9~6.0℃.High emittance of the metal PET results in significant temperature reading errors on the food tray when measured with an infrared thermal imaging camera.Tyvek’s emission rate was similar to that of the infrared thermal imaging camera,which obtained a lower temperature error.This study could provide theoretical explanation and data support for the application of infrared thermal imaging technology to temperature monitoring of food pallet.