An online measurement for the emissivity of heating surface was introduced,especially for the problem of temperature compensation in long-time continuous measurement. The instrument mainly consists of a hemisphere reflector,a hemisphere absorber, thermopile detectors and several temperature measurement components. The errors compensation problem in measuring the emissivity based on the simulated blackbody was analyzed and a reasonably practicable compensation model was established. Through this model,the affect of the temperature variety of reflector, absorber and the detector cold-side was eliminated and then the task of long-time continuous online emissivity measurement can be accomplished. The contrast experiment results on the metal plates whose emissivity are known confirm that this approach is feasible and has good application prospects.%为了解决发射率长时持续测量中的温度补偿问题,介绍了一种发热物体表面发射率的在线测量方法.其系统由半球反射罩、半球吸收罩、热电堆探测器和补偿用各测温元件等组成.文中详细分析了基于转换黑体法的发射率测量中的误差补偿问题,建立了合理可行的补偿模型,消除了反射罩、吸收罩和探测器冷端温度变化带来的影响,从而实现发射率的长时持续在线实时测量.通过对实验室标准样板进行对比实验,证实该方法切实可行,具有较好的应用前景.
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