基于CFD技术的微波定标源亮温评定方法

年丰; 杨于杰; 王伟

doi:10.11834/jrs.20119350

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基于CFD技术的微波定标源亮温评定方法
A method for evaluating the microwave blackbody’s equivalent brightness temperature by the Computational Fluid Dynamics simulation technologies
2011年15卷第4期页码：687-695
纸质出版日期： 2011 ，
DOI： 10.11834/jrs.20119350

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[1]年丰,杨于杰,王伟.基于CFD技术的微波定标源亮温评定方法[J].遥感学报,2011,15(04):687-695.

A method for evaluating the microwave blackbody’s equivalent brightness temperature by the Computational Fluid Dynamics simulation technologies[J]. Journal of Remote Sensing, 2011,15(4):687-695.
[1]年丰,杨于杰,王伟.基于CFD技术的微波定标源亮温评定方法[J].遥感学报,2011,15(04):687-695. DOI： 10.11834/jrs.20119350.

A method for evaluating the microwave blackbody’s equivalent brightness temperature by the Computational Fluid Dynamics simulation technologies[J]. Journal of Remote Sensing, 2011,15(4):687-695. DOI： 10.11834/jrs.20119350.

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。

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.