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为了提高星载光辐射测量精度,满足在轨测量数据向世界辐射参考标准溯源的需求,运用有限元单元法对太阳辐照度绝对辐射计(SIAR)的光电不等效性进行修正。SIAR采用典型的正圆锥腔结构及加热丝直接埋入银锥腔工艺,其光电不等效性源于激光加热照射时一次反射引起的偏差。针对该偏差定量修正难度较大的特点,结合SIAR腔组件的实际结构,建立与实验测量结果最大相对误差仅为0.86%的有限元体系,并运用该体系对SIAR的光电不等效性进行定量修正。修正结果表明,光束的一次反射引起了激光加热和电加热阶段的不同功率分布,其光电不等效性因子为1.0000589,不确定度为3.4×10-6。运用该因子对测量数据进行修正,得到SIAR的太阳总辐照度实际测量结果为(1365.70±1.24)W/m2。该修正完善了绝对辐射计的修正体系。
In order to improve the measurement accuracy of spaceborne optical radiation and meet the traceability requirements of in-orbit measurement data to the world radiation reference standard, the photoelectric inequality of solar irradiance absolute radiometer (SIAR) was modified by finite element method. SIAR adopts the typical positive cone cavity structure and the heating wire buried directly into the silver cone cavity process. The photoelectric inequality results from the deviation caused by one reflection when the laser is heated and irradiated. In view of the difficulty of quantitatively correcting the deviation, the maximum relative error between experimental result and experimental result is 0.86% based on the actual structure of SIAR cavity. The system is used to quantify the photoelectric inequality of SIAR Fixed. The results show that the primary reflection of the laser beam causes different power distributions during laser heating and electric heating. The photoequivalence factor is 1.0000589 and the uncertainty is 3.4 × 10-6. Using this factor to correct the measurement data, the actual solar irradiance obtained by SIAR is (1365.70 ± 1.24) W / m2. This amendment completes the correction system of the absolute radiometer.