【摘要】 基于计算流体动力学仿真技术对微波定标源表面物理温度分布进行了仿真,解决了现有测温手段难以对小尺寸定标源尖劈进行高精度温度测量的问题,在此基础上建立了定标源等效输出物理温度的评定方法,并给出测温电阻埋设深度的建议值,从而有效减少测温电阻测量值与定标源等效表面物理温度值的差值,给出定标源输出亮温度不确定度小于0.5K的合理评定结果,提高了微波辐射计定标系统的精度评估水平。更多还原

【Abstract】 The microwave calibration target’s surface temperature is simulated using the computational fluid dynamics simulation technologies, which overcomes the difficulties of traditional methods in measuring the small wedge of calibration targets at a high precision. An evaluation method to calculate the calibration target’s equivalent output temperature is introduced and the ref- erence depth value of embedding the temperature sensor is applied, which efficiently reduces the difference between the sensor’s measurement value and the calibration target’s equivalent output temperature. The uncertainty of the calibration target’s bright- ness temperature can be reduced within 0.5 K, which highly increases the measurement evaluation precision of the radiometer’s calibration system.更多还原