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发射率是辐射度学中的一个重要参数。常温地物在热红外波段8～14μm的辐射特性的测量是红外遥感中的重要部分,因此需要探讨实用的测量方法。六十年代后,国内外先后提出几种典型的测量物体发射率的方法和装置,这些方法和装置较适合于实验室测量,都要求有较严格的控温措施,装置也较笨重,同时精度也待进一步提高,很难适用于遥感工作的野外测量。我们根据常温地物的热辐射关系,针对如何克服常温条件下测量常温地物的发射率和表面实际温度所面临的环境辐射的影响问题,改进了已有的测量方法,提出了用镜反射园筒腔罩在被测物上获得和被测物温度相同的等效黑体辐射,同时由已知发射率值的参考板标定出测量时的等效环境辐射,这样就可达到测量地物发射率和表面温度的目的。
Emissivity is an important parameter in radiometry. The measurement of the radiation characteristics at room temperature in the infrared band of 8 ~ 14μm is an important part of infrared remote sensing. Therefore, practical measurement methods need to be explored. After the 1960s, several typical methods and devices for measuring the emissivity of objects have been proposed both at home and abroad. These methods and devices are more suitable for laboratory measurements and require more stringent temperature control measures. The devices are also bulky, while the accuracy Also need to be further improved, it is difficult to apply to the field work of remote sensing. According to the relationship between the thermal radiation of normal temperature objects and how to overcome the influence of the emissivity measured at ambient temperature and the ambient radiation on the actual temperature at room temperature, the existing measurement methods are improved. The barrel cavity captures the equivalent blackbody radiation of the same temperature as the measured object on the measured object, and the equivalent environmental radiation at the time of measurement is calibrated by the reference board with the known emissivity value, so that the measured object emissivity And the purpose of surface temperature.