SUS304钢表面粗糙度对红外图像的影响

Effect of SUS304 Steel Surface Roughness on Infrared Image

为提高红外热像仪图像及测温精度,根据红外热像仪的测温原理和红外辐射原理,通过使用红外热像仪、CCD相机以及激光表面形状测量显微镜,研究了SUS304钢在单轴拉伸塑性变形过程中表面粗糙度与目标发射率的关系;并用热电偶和红外热像仪对塑性变形过程中的温度分布进行了测量。研究结果表明,目标发射率随表面粗糙度成比例增大,造成红外热像仪测定的塑性变形区域比实际变形区域大;通过预先设定材料的表面粗糙度,以提高有效目标发射率,能得到较好的红外图像和测温精度。

In order to improve the accuracy of infrared image and measured temperature, the relation between surface roughness and emissivity of SUS304 steel in plastic deformation under uniaxial tension was studied by using infrared imager, CCD camera and laser surface shape measuring microscope, based on the measurement principle of infrared imaging and the principle of infrared radiation. The temperature distribution in plastic deformation was measured by using thermocouple and thermal infrared imager. Results show that the emissivity is increased proportionably with surface roughness, resulting in the plastic deformation zone measured by the thermal infrared imager is larger than practical deformation area. The effective emissivity may he improved through setting the surface roughness of the material in advance, thereby better infrared image and higher temperature measurement precision can be obtained.